Manual, Continuous Rotation Mounts


  • Lockable Rotation Mounts for Ø1/2", Ø1", and Ø2" Optics
  • All Models Offer 360° Rotation
  • SM-Threaded Optic Bores

RSP2D

Ø2" Rotation Mount with Adjustable Zero

MRM05

Ø1/2" Mini-Series Rotation Mount

DLM1

Ø1" Dual Rotation Mount

RSP1X15

Indexing Rotation Mount for Discrete 15° Rotation

Application Idea

CLR1 Rotation Mount Lets Optic Rotate While Both Lens Tubes Remain Fixed (All Sold Separately)

LRM1

Ø1" Rotation Mount, External SM1 Threads

Related Items


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Features

  • Rotation Mounts with 360° Continuous Rotation
  • Rotational Position Lockable via Setscrew
  • Full 360° Engraved Scale Marked in 2° Increments
  • For Mounting Options, See Table Below

Thorlabs offers a diverse line of continuous rotation mounts to accommodate a variety of optic sizes and applications. These mounts provide smooth, backlash-free rotation in compact, lockable packages. To mount an optic, simply place it within the central SM-threaded bore and secure it using a spanner wrench with the included retaining ring. Rotation mounts are available for Ø1/2", Ø1", and Ø2" optics. An easy-to-read radial scale offers 2° graduation marks, labeled every 20°, for precise incremental movement and repeatable positioning.

Standard rotation mounts, including the MRM05(/M), RSP05(/M), RSP1(/M), and RSP2(/M) are post mountable, and feature a locking screw to fix the rotational position. The MRM05(/M) and RSP05(/M) rotation mounts hold Ø1/2" optics, and the MRM05(/M) can be used with our Mini-Series Optical Assemblies. The RSP1D(/M) and RSP2D(/M) rotation mounts hold Ø1" or Ø2" optics, respectively, and offer similar functionality to our standard rotation mounts with the added feature of a rotatable dial: the front dial face can be rotated separately from the optic cell and then locked down. This allows the engraved scale to be aligned with an axis of the optic, such as the fast axis of a wave plate.

The CRM05 and LRM1 rotation mounts hold Ø1/2" or Ø1" optics, respectively, and feature external SM1 (1.035"-40) threads for integrating optics into SM1 lens tube or 30 mm cage cube systems. The front dial face rotates the optic inside the mount, but the external SM1 threads are fixed.

The CLR1(/M) rotation mount is designed to orient rotationally sensitive Ø1" optics within SM1 lens tube systems. Round cylindrical lenses, wave plates, and other polarization optics are commonly used with this mount. Unlike our other rotation mounts, the CLR1(/M) allows for lens tubes to be attached to either end and remain stationary as the mounted optic is rotated.

For applications that require rotation in discrete increments, we offer the RSP1X15(/M) and RSP1X225(/M) mounts for Ø1" optics. These mounts have a top-located setscrew [5/64" (2.0 mm) hex] that, when loosened, allows for continuous 360° motion. With the setscrew tightened, the mount can be rotated through a number of indexed positions in discrete increments.

The DLM1(/M) dual rotation mount features two independently rotating optic carriages that allow two optics to be mounted in close proximity. The carriages are magnetically attached to the main body of the mount so that they can be removed and replaced as needed. Extra optic carriages are available separately.

Thorlabs also offers rotation mounts that are compatible with our 16 mm, 30 mm, and 60 mm cage systems. For demanding applications, we offer high-resolution, micrometer-driven rotation mounts providing roughly 2.4 arcmin per micrometer division. Please see the Rotation Mounts and Stages tab for our entire selection of rotation mounts and stages.

Quick Links
Product Image
(Click to Enlarge)
MRM05 RSP05 CRM05 CRM05 RSP1 DLM1 RSP1D CLR1 RSP1X15 RSP2 RSP2D
Item # MRM05(/M) RSP05(/M) CRM05 LRM1 RSP1(/M) DLM1(/M) RSP1D(/M) CLR1(/M) RSP1X15(/M)
RSP1X225(/M)
RSP2(/M) RSP2D(/M)
Optic Size Ø1/2" Ø1" Ø2"
Internal Threading SM05 (0.535"-40) SM1 (1.035"-40) SM2 (2.035"-40)
Additional
Features
- External SM1 (1.035"-40) Threads - Two Independently Rotating Carriages Adjustable Zero Rotates Optic Within Fixed Lens Tube System Continuous 360° or Indexed Rotation - Adjustable Zero
Post Mounting 4-40 (M3)
Stud
8-32 (M4) Tap None 8-32 (M4) Tap

Threading Specifications

The following is a general overview of screw threading. For more details regarding specifications and dimensions, please consult the Machinery's Handbook, available for purchase at many bookstores.

Features of a Thread
A thread consists of three repeating features: a crest, flank, and root (see drawing to the right). Except in special cases, threads have symmetrical sides inclined at equal angles when a vertical line is drawn through the center of a crest or root. The distance between corresponding points on adjacent threads is known as the pitch of the thread. The flank angle is defined as the angle the flank makes with a perpendicular ray drawn from the screw axis. Unless otherwise stated, threads have a flank angle of 30°, resulting in a total angle between flanks of 60°. Each feature is shown in the diagram to the right.

The major diameter is taken from the crests of a thread while the minor diameter is taken from the roots. For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.

Thread Form
A thread form is a set of rules that define the features' scale relative to one another. Common thread forms include the Unified Screw Thread Form, used in the United States of America and measured in imperial units, and the ISO Metric Screw Thread Form, used in many parts of the world and measured with the International System of Units. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF. Those forms which are not standardized by the Unified screw thread system are designated UNS.

Thread Series
Most screws are identified by their thread series. Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. For example, in the Unified nomenclature, a 1/4"-20 cap screw has a 1/4" diameter barrel and the pitch is 20 threads per inch (TPI). In metric nomenclature, an M4 x 0.7 cap screw has a 4 mm barrel and the pitch is 1 thread per 0.7 mm. The term M4 x 0.7 is often shortened to just M4.

Unified Thread Class Tolerancing
Location Loose Optimal Strict
Internal 1B 2B 3B
External 1A 2A 3A
Metric Thread Tolerance Positions
Location Loose Optimal Strict
Internal - G H
External e or f g h
Metric Thread Tolerance Grades
Dimension Location Tolerance Gradesa
Minor Diameter Internal 4, 5, 6, 7, 8
Major Diameter External 4, 6, 8
Pitch Diameter Internal 4, 5, 6, 7, 8
External 3, 4, 5, 6, 7, 8, 9
  • The tolerance becomes looser as the grade increases. The underlined grades are used with normal lengths of thread engagement.

Thread Class
The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.

Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance. Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads.

Quoting from the Machinery's Handbook, 29th Edition, p. 1885: "To designate the tolerance class, the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H."

Thorlabs' SM Series Threads
Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. Most SM series threads utilize a non-standard Unified thread form, indicated by the letters UNS, with a 30° flank angle and a thread class of 2A and 2B. The exception is our SM30 series thread, which is a Metric thread form with a 30° flank angle and a tolerance of 6H/6g. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. Please note that other manufacturers may have different tolerances for C-Mount and RMS threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0 UNS-2A Internal Thread, 0.535"-40.0 UNS-2B
Max Major Diameter 0.5340" Min Major Diameter 0.5350"
Min Major Diameter 0.5289" Min Pitch Diameter 0.5188"
Max Pitch Diameter 0.5178" Max Pitch Diameter 0.5230"
Min Pitch Diameter 0.5146" Min Minor Diameter (and 83.3% of Thread) 0.508"
Max Minor Diameter 0.5069" Max Minor Diameter (and 64.9% of Thread) 0.514"
RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0 UNS-2A Internal Thread, 0.800"-36.0 UNS-2B
Max Major Diameter 0.7989" Min Major Diameter 0.8000"
Min Major Diameter 0.7934" Min Pitch Diameter 0.7820"
Max Pitch Diameter 0.7809" Max Pitch Diameter 0.7866"
Min Pitch Diameter 0.7774" Min Minor Diameter (and 83.3% of Thread) 0.770"
Max Minor Diameter 0.7688" Max Minor Diameter (and 64.9% of Thread) 0.777"
C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras
External Thread, 1.000"-32.0 UN-2A Internal Thread, 1.000"-32.0 UN-2B
Max Major Diameter 0.9989" Min Major Diameter 1.0000"
Min Major Diameter 0.9929" Min Pitch Diameter 0.9797"
Max Pitch Diameter 0.9786" Max Pitch Diameter 0.9846"
Min Pitch Diameter 0.9748" Min Minor Diameter (and 83.3% of Thread) 0.966"
Max Minor Diameter 0.9651" Max Minor Diameter (and 64.9% of Thread) 0.974"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0 UNS-2A Internal Thread, 1.035"-40.0 UNS-2B
Max Major Diameter 1.0339" Min Major Diameter 1.0350"
Min Major Diameter 1.0288" Min Pitch Diameter 1.0188"
Max Pitch Diameter 1.0177" Max Pitch Diameter 1.0234"
Min Pitch Diameter 1.0142" Min Minor Diameter (and 83.3% of Thread) 1.008"
Max Minor Diameter 1.0068" Max Minor Diameter (and 64.9% of Thread) 1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5 x 0.5 – 6H/6g Internal Thread, M30.5 x 0.5 – 6H/6g
Max Major Diameter 30.480 mm Min Major Diameter 30.500 mm
Min Major Diameter 30.371 mm Min Pitch Diameter 30.175 mm
Max Pitch Diameter 30.155 mm Max Pitch Diameter 30.302 mm
Min Pitch Diameter 30.059 mm Min Minor Diameter (and 83.3% of Thread) 29.959 mm
Max Minor Diameter 29.938 mm Max Minor Diameter (and 64.9% of Thread) 30.094 mm
SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40 UNS-2A Internal Thread, 1.535"-40 UNS-2B
Max Major Diameter 1.5339" Min Major Diameter 1.535"
Min Major Diameter 1.5288" Min Pitch Diameter 1.5188"
Max Pitch Diameter 1.5177" Max Pitch Diameter 1.5236"
Min Pitch Diameter 1.5140" Min Minor Diameter (and 83.3% of Thread) 1.508"
Max Minor Diameter 1.5068" Max Minor Diameter (and 64.9% of Thread) 1.514"
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0 UNS-2A Internal Thread, 2.035"-40.0 UNS-2B
Max Major Diameter 2.0338" Min Major Diameter 2.0350"
Min Major Diameter 2.0287" Min Pitch Diameter 2.0188"
Max Pitch Diameter 2.0176" Max Pitch Diameter 2.0239"
Min Pitch Diameter 2.0137" Min Minor Diameter (and 83.3% of Thread) 2.008"
Max Minor Diameter 2.0067" Max Minor Diameter (and 64.9% of Thread) 2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0 UNS-2A Internal Thread, 3.035"-40.0 UNS-2B
Max Major Diameter 3.0337" Min Major Diameter 3.0350"
Min Major Diameter 3.0286" Min Pitch Diameter 3.0188"
Max Pitch Diameter 3.0175" Max Pitch Diameter 3.0242"
Min Pitch Diameter 3.0133" Min Minor Diameter (and 83.3% of Thread) 3.008"
Max Minor Diameter 3.0066" Max Minor Diameter (and 64.9% of Thread) 3.014"
SM4 Threading: Ø4" Lens Tubes
External Thread, 4.035"-40 UNS-2A Internal Thread, 4.035"-40.0 UNS-2B
Max Major Diameter 4.0337" Min Major Diameter 4.0350"
Min Major Diameter 4.0286" Min Pitch Diameter 4.0188"
Max Pitch Diameter 4.0175" Max Pitch Diameter 4.0245"
Min Pitch Diameter 4.0131" Min Minor Diameter (and 83.3% of Thread) 4.008"
Max Minor Diameter 4.0066" Max Minor Diameter (and 64.9% of Thread) 4.014"

Reading a Vernier Scale on a Linear Main Scale

Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scales on Thorlabs' rotation, goniometric, or translation mounts). A vernier scale has found common use in many precision measurement instruments, the most common being calipers and micrometers. The vernier scale uses two scales side-by-side: the main scale and the vernier scale. The direct vernier scale has a slightly smaller spacing between its tick marks owing to the vernier scale having N ticks for every N - 1 ticks on the main scale. Hence, the lines on the main scale will not line up with all the lines on the vernier scale. Only one line from the vernier scale will match well with one line of the main scale, and that is the trick to reading a vernier scale.

Figures 1 through 3 show a linear vernier scale system for three different situations. In each case, the scale on the left is the main scale, while the small scale on the right is the vernier scale. When reading a vernier scale, the main scale is used for the gross number, and the vernier scale gives the precision value. In this manner, a standard ruler or micrometer can become a precision instrument.

The 0 on the vernier scale is the "pointer" (marked by a red arrow in Figures 1 - 5) and will indicate the main scale reading. In Figure 1 we see the pointer is lined up directly with the 75.6 line. Notice that the only other vernier scale tick mark that lines up well with the main scale is 10. Since the pointer lines up with the main scale’s 75.6, the reading from Figure 1 is 75.60 (in whatever units the instrument measures).

That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement instrument. To expound, let’s look at Figure 2. Here we see that the pointer is no longer aligned with a line on the main scale, but instead it is slightly above 75.6 and below 75.7; thus, the gross measurement is 75.6. The first vernier line that coincides with a main scale line is the 5, shown with a blue arrow. The vernier scale gives the final digit of precision; since the 5 is aligned to the main scale, the precision measurement for Figure 2 is 75.65.

Since this vernier scale is 10% smaller than the main scale, moving the vernier scale by 1/10 of the main scale will align the next vernier marking. This asks the obvious question: what if the measurement is within the 1/10 precision of the vernier scale? Figure 3 shows just this. Again, the pointer line is in between 75.6 and 75.7, yielding the gross measurement of 75.6. If we look closely, we see that the vernier scale 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier scale 7 is very slightly above the main scale mark, and we can see that the vernier scale 8 (directly above 7) is slightly below its corresponding main scale mark. Hence, the scale on Figure 3 could be read as 75.673 ± 0.002. A reading error of about 0.002 would be appropriate for
this instrument.

Figure 1: Vernier scale measuring 76.0
Click to Enlarge

Figure 1: An example of how to read a vernier scale. The red arrow indicates what is known as the pointer. Since the tick mark labeled 10 on the vernier scale aligns with one of the tick marks on the main scale, this vernier scale is reading 75.60 (in whatever units the instrument measures).
Figure 1: Vernier scale measuring 76.0
Click to Enlarge

Figure 2: The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.
Figure 1: Vernier scale measuring 76.0
Click to Enlarge

Figure 3: The red arrow indicates the pointer, and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.67 but can be accurately read as
75.673 ± 0.002.

 

Reading a Vernier Scale on a Rotating Main Scale

The vernier scale may also be used on rotating scales where the main scale and vernier scale do not share units. Figures 4 and 5 show a vernier scale system for two different situations where the main scale is given in degrees and the vernier scale has ticks every 5 arcmin (60 arcmin = 1°). In each case, the scale on the top is the main scale, while the small scale on the bottom is the vernier scale.

In Figure 4 we see the pointer is lined up directly with the 341° line. Notice that the only other vernier scale tick marks that line up well with the main scale are ±60 arcmin. Since the pointer lines up with the main scale at 341°, the reading from Figure 4 is 341.00°.

There are two ways to determine the reading if the zero on the vernier scale line is between two lines of the main scale. For the first method, take the line on the left side of the pointer on the vernier scale and subtract that value (in arcmin) from the value on the main scale that is to the right on the main scale. As an example, in Figure 5 the vernier pointer is between 342° and 343°; using the left blue arrow of the vernier scale results in 343° - 15 arcmin = 342.75°. The second method is to take the reading from the blue arrow on the right side of the vernier pointer and add that value to the lower value from the main scale; reading the right blue arrow in Figure 5 results in 342° + 45 arcmin = 342.75°.

As we've seen here, vernier scales add precision to a standard scale measurement. While it takes a bit of getting used to, with a little practice, reading these scales is fairly straightforward. Vernier scales, whether they are direct or retrograde*, are read in the same fashion.

*A retrograde vernier scale has a larger spacing between its tick marks with N ticks for every N + 1 ticks on the main scale.

Figure 1: Vernier scale measuring 341.00°.
Click to Enlarge

Figure 4: An example of a vernier scale where the main scale and the vernier scale are in different units (degrees and arcmins, respectively). The red arrow indicates the pointer. This scale reads 341.00°.
Figure 2: Vernier scale measuring 342.75°.
Click to Enlarge

Figure 5: The red arrow indicates the pointer and the blue arrows give the precision value from the vernier scale.
This scale reads 342.75°.

Posted Comments:
Kamrul Ome  (posted 2024-08-15 16:56:11.59)
Until someone picks up one of these pieces and tries it themselves, it is difficult to understand that the wave plate holders are magnetically attached to the mount. To put a wave plate in there, one needs to use a retainer ring. Moreover, one should clarify whether there is any preferred orientation for the wave plate holders. These aspects can easily be clearly described in a manual, which I believe would make these sorts of devices more popular. The reader may think that these are small details and unimportant, but any competent physicist knows that small details matter at the end of the day. Many people don't get this, but clarity and rigor prevail over everything. Thanks.
cdolbashian  (posted 2024-08-26 09:26:13.0)
Thank you for reaching out to us with this inquiry. Much of the information you are searching for can be found directly on the product page in the product description. I have contacted you directly to discuss your inquiries and show you where to find similar types of information in the future.
user  (posted 2024-08-15 07:46:11.09)
Since LRM1 has both an internal and an external thread I was wondering if I can combine two of them to mount and rotate two separate waveplates independently from each other? As in mounting each waveplate in one of the mounts, then screwing the two mounts into each other and then still being able to rotate each plate independently? Thanks a lot in advance
cdolbashian  (posted 2024-08-26 08:37:55.0)
Thank you for reaching out to us with this inquiry. While this is technically feasible to do, you may run into some difficulties when rotating one with respect to the other, as they are threaded into each other's rotation element. Because of this, you might have some trouble explicitly rotating just one, while holding the other stationary. I have reached out to you with a few alternate part suggestions in order to achieve the result you described.
Aleksej Majkic  (posted 2023-01-26 10:26:58.213)
We have a RSP1X15/M rotation mount, which is very tight (it needs considerable torque to rotate it). Is there a recomended procedure to remedy this? Like dismantling&oiling it, or just oiling it? Thank you.
jdelia  (posted 2023-02-02 08:55:26.0)
Thank you for contacting Thorlabs. You are welcome to try using some grease/oil to get a smoother rotation, however we do not recommend dismantling the mount. It is also important to make sure that the screw at the top of the mount is disengaged. I have reached out to you directly to troubleshoot this with you and discuss your application further.
user  (posted 2022-03-02 02:16:11.153)
It looks like our optic is rotating around a different axis than it's center. Do you have an estimate on the variance of the distance from the rotation axis and the center of the thread? Maybe this particular mount is a outlier, so I would like to know if that is the case and if replacing it would solve the problem.
jdelia  (posted 2022-03-11 08:04:33.0)
Thank you for contacting Thorlabs. I have contacted you directly to discuss your application.
user  (posted 2021-11-09 12:15:01.383)
Dear madam or sir, are there any items like MRM05 but have a countersunk hole in alignment key or a magnetic base? Thanks!
YLohia  (posted 2021-12-23 11:36:39.0)
Thank you for contacting Thorlabs. What are you referring to when you say "alignment key"? Could you please provide a diagram to illustrate exactly what you're looking for? I have reached out to you directly to discuss this further.
Anitta Rose Thomas  (posted 2020-01-15 10:59:12.483)
Is there any M4 tapped hole in LRM1.? Looking forward Thanks Anitta
YLohia  (posted 2020-01-15 08:42:26.0)
Hello Anitta, thank you for contacting Thorlabs. The LRM1 mount is specifically designed to be mounted to other optic mounts/tubes featuring SM1 threads. You may use the LRM1 along with our LMR1/M to get the ability to mount with an M4 tap. We also offer the RSP1/M, which is similar to the LRM1 but is designed with an M4 tapped hole for mounting.
Markus G  (posted 2019-06-11 12:53:18.293)
Is there a specification for tip/tilt of a mounted element during a 360° rotation? I would be especially interested to get specs for the mounts RSP1/M and RSP1X15/M.
YLohia  (posted 2019-06-28 02:45:46.0)
Hello, thank you for contacting Thorlabs. Based on our testing, we expect the typical wobble to be the following over a full 360 degree rotation range: RSP1 – 50 µrad RSP1X15 – 300 µrad RSP1X15 (with indexing rotation engaged) - 500 µrad
user  (posted 2019-05-07 08:04:24.55)
does not have enough thread to lock into a CCM beamsplitter consistently - instead it goes past the thread and just spins
llamb  (posted 2019-05-08 01:14:20.0)
Thank you for your feedback. The LRM1 features the same 3 mm long external SM1 thread as our standard SM1 lens tubes. I see you did not leave contact information, so please reach out to your local Thorlabs Tech Support team (techsupport.uk@thorlabs.com) with further details to clarify what exactly is spinning.
cottsb  (posted 2018-11-27 15:43:59.67)
Is it possible to reindex the mount after mounting a polarizer or other optic. That is using a transmission measurement through a mounted optic to find the precise V or H position and reindexing that to zero on the mount?
YLohia  (posted 2018-11-28 08:39:00.0)
Unfortunately, the RSP1 cannot be reindexed. To adjust the zero position, we recommend the RSP1D mount.
lrotter  (posted 2018-08-08 17:52:58.373)
What is the indexing angle repeatability for RSP1X__?
llamb  (posted 2018-08-16 04:49:17.0)
Thank you for contacting Thorlabs. The indexing angle repeatability is at worst ±0.5°, which is the angular tolerance for the v-grooves contained in the indexing ring.
syim  (posted 2018-04-12 00:06:27.89)
Could you make "RSP1D/M" without retaining lip? I hope to connect another SM1 threaded mount on the back side. Thank you.
llamb  (posted 2018-04-12 08:17:56.0)
Hello, thank you for contacting Thorlabs. We may be able to offer a custom rotation mount without the retaining lip. We will reach out to you directly to discuss a quote and our custom capabilities.
user  (posted 2017-11-17 00:49:03.503)
I'd love to buy a simple rotation mount (like RSP05, RSP1, or RSP2) for 1.5 inch optics.
nbayconich  (posted 2017-12-18 03:41:31.0)
Thank you for your feedback. We are happy to here suggestions from our customers on how to improve our variety of products. As an alternative solution a Ø1.5" optic can be mounted to a Ø2" rotational mount like RSP2 by using the SM2AD1.5 adapter for Ø1.5" optics. I will reach out to you directly to discuss our custom capabilities. https://www.thorlabs.com/thorproduct.cfm?partnumber=SM2AD1.5
marinaphotonics  (posted 2016-08-08 10:41:39.05)
I have 150 3" wedges and need to put them together in pairs. What would it take to get the RSP2D or similar up to 3"
nday  (posted 2015-11-16 15:12:35.897)
I'll likely go with a non-indexing version, but I'd love to see a 30mm cage version of the Indexing Rotation Mounts for Ø1" Optics, RSP1X15 and RSP1x225 and their metric versions. (My specific project would use a RSP1X15.) Great equipment, and I really appreciate how responsive Thorlabs is to customer questions. Thank you!
besembeson  (posted 2015-11-19 10:09:50.0)
Response from Bweh at Thorlabs USA: Thanks for your kind words and thanks for the suggestion. We will review this and I will follow up with you to know more about your application. For now we only have 30mm cage-system compatible continuous rotation mounts: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1885&pn=CRM1
user  (posted 2013-03-27 12:16:01.643)
Do you have a Continuous Rotation Mount for Ø1/2" Optics directly mountable on SM1 thread?
cdaly  (posted 2013-04-03 16:12:00.0)
Response from Chris at Thorlabs: Thank you for using our web feedback. No we do not have a rotation mount exactly like this, but the CLR1 can be mounted onto an SM1 thread and a half inch optic rotated continuously within using an adapter like SM1A6(T) or AD1.
olsonaj  (posted 2013-03-17 13:54:58.173)
do you have a rotation mount that could accommodate a 30mm diameter waveplate? Perhaps with an adapter of some type?
jlow  (posted 2013-03-18 13:35:00.0)
Response from Jeremy at Thorlabs: We do not have a 30mm rotation mount. However, we do have the RSP2 which you can use with a SM2A11 adapter and SM30L05 to mount a Ø30mm optic.
technicalmarketing  (posted 2007-08-16 10:41:30.0)
Wave plate and polarizer links have been added to the related items tab. Thank you for the suggestion.
acable  (posted 2007-08-15 00:09:19.0)
Waveplates and polarizers are the most used optical elements that require a rotation stage, please consider adding to the "Related Item" tab.

Rotation Mount and Stage Selection Guide

Thorlabs offers a wide variety of manual and motorized rotation mounts and stages. Rotation mounts are designed with an inner bore to mount a Ø1/2", Ø1", or Ø2" optic, while rotation stages are designed with mounting taps to attach a variety of components or systems. Motorized options are powered by a DC Servo motor, 2 phase stepper motor, piezo inertia motor, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.

Manual Rotation Mounts

Rotation Mounts for Ø1/2" Optics
Item # MRM05(/M) RSP05(/M) CRM05 PRM05(/M)a SRM05 KS05RS CT104
Click Photo
to Enlarge
Features Mini Series Standard External SM1
(1.035"-40) Threads
Micrometer 16 mm Cage-Compatible ±4° Kinematic Tip/Tilt Adjustment Plus Rotation Compatible with 30 mm Cage Translation Stages and 1/4" Translation Stagesb
Additional Details
  • This mount is available in the PRM05GL5 bundle, which includes the PRM05 rotation mount with the SM05PM5 polarizing prism mount.
  • The CT104 is complatible with the 1/4" translation stages using our MS103(/M) adapter plate.
  • The CT104 is compatible with the CT1A(/M) cage translation stage, which is designed for use with 30 mm cage systems.

Rotation Mounts for Ø1" Optics
Item # RSP1(/M) LRM1 RSP1D(/M) DLM1(/M) CLR1(/M) RSP1X15(/M) RSP1X225(/M) PRM1(/M)a
Click Photo
to Enlarge
LRM1
Features Standard External SM1
(1.035"-40) Threads
Adjustable Zero Two Independently Rotating Carriages Rotates Optic Within
Fixed Lens Tube System
Continuous 360° Rotation
or 15° Increments
Continuous 360° Rotation
or 22.5° Increments
Micrometer
Additional Details
  • This mount is available in the PRM1GL10 bundle, which includes the PRM1 rotation mount with the SM1PM10 polarizing prism mount.

Rotation Mounts for Ø1" Optics
Item # LM1-A &
LM1-B(/M)
CRM1T(/M) CRM1LT(/M) CRM1PT(/M) KS1RS K6XS
Click Photo
to Enlarge
Features Optic Carriage Rotates Within Mounting Ring 30 mm Cage-Compatiblea 30 mm Cage-Compatible
for Thick Opticsa
30 mm Cage-Compatible
with Micrometera
±4° Kinematic Tip/Tilt Adjustment Plus Rotation Six-Axis
Kinematic Mounta
Additional Details
  • This mount also features four 4-40 (M3) holes on the rotation dial for use with the K6A1(/M) prism platform.

Rotation Mounts for Ø2" Optics
Item # RSP2(/M) RSP2D(/M) PRM2(/M) LM2-A &
LM2-B(/M)
LCRM2A(/M) KS2RS K6X2
Click Photo to Enlarge
Features Standard Adjustable
Zero
Micrometer Optic Carriage Rotates Within Mounting Ring 60 mm Cage-Compatible ±4° Kinematic Tip/Tilt Adjustment Plus Rotation Six-Axis Kinematic Mount
Additional Details
Rotation Drive Mechanism and Adjustment Range Manual, 360° Continuous Coarse: Manual, 360° Continuous;
Fine: ±7° Micrometer
Manual, 360° Continuous
Optic Mounting Internally SM2-Threaded Carriage Internal SM2 Threads
in LM2-A
Internally SM2-Threaded Carriage
Maximum Accepted Optic Thickness 0.51" (13 mm) 0.54" (13.7 mm) 0.48" (12.2 mm) 0.46" (11.7 mm) 0.52" (13.2 mm) 0.47" (12 mm) 0.53" (13.4 mm)
Post Mounting 8-32 (M4) Tap 8-32 (M4) Tap in LM2-B 8-32 (M4) Tap Four Counterbores for 8-32 (M4) Cap Screws Six Counterbores for 8-32 (M4) Cap Screws
Cage System Compatibility N/A Four 4-40 (M3) Taps on Rotation Dial
with 60 mm Spacing
N/A Four Bores for
Ø6 mm Cage Rods
with 60 mm Spacing
N/A N/A

Manual Rotation Stages

Manual Rotation Stages
Item # RP005(/M) PR005(/M) MSRP01(/M) RP01(/M) RP03(/M) QRP02(/M)
Click Photo
to Enlarge
Continuous Rotation Mount
Features Standard Two Hard Stops
Additional Details

Manual Rotation Stages
Item # XRNR1(/M) XRR1(/M) PR01(/M) CR1(/M) XYR1(/M) OCT-XYR1(/M)
Click Photo
to Enlarge
Features Fine Rotation Adjuster and
2" Wide Dovetail Quick Connect
Fine Rotation Adjuster and
3" Wide Dovetail Quick Connect
Fine Rotation Adjuster and
SM1-Threaded Central Aperture
Fine Pitch Worm Gear Rotation and 1/2" Linear XY Translation
Additional Details
  • The stage profile is higher when it is mounted using the screw slots rather than stacked on another stage or accessory with mating dovetails.
  • The OCT-XYR1(/M) stage includes the XYR1A solid sample plate. This plate can be detached from the stage to reveal the same mounting features present on the XYR1(/M) stage.

Motorized Rotation Mounts and Stages

Motorized Rotation Mounts and Stages with Central Clear Apertures
Item # DDR25(/M) PDR1C(/M) PDR1(/M) PDR1V(/M) PDXR1(/M)
Click Photo
to Enlarge
DDR25 PDR1C PDR1 PDR1V PDXR1
Features Compatible with
SM05 Lens Tubes,
16 mm Cage System, &
30 mm Cage System
Compatible with
16 mm Cage System
Compatible with
SM05 Lens Tubes &
30 mm Cage System
Vacuum-Compatible;
Also Compatible with
SM05 Lens Tubes &
30 mm Cage System
Compatible with
SM05 Lens Tubes &
30 mm Cage System
Additional Details

Motorized Rotation Mounts and Stages with Central Clear Apertures
Item # K10CR1(/M) PRM1Z8(/M)a DDR100(/M) ELL14 HDR50(/M)
Click Photo
to Enlarge
ELL14
Features Compatible with SM1 Lens Tubes & 30 mm Cage System Compatible with
SM1 Lens Tubes,
16 mm Cage System,
30 mm Cage System
Compatible with
SM1 Lens Tubes,
Open Frame Design for
OEM Applications
Compatible with
SM2 Lens Tubes
Additional Details
  • This stage is available in the KPRMTE(/M), which includes the PRMTZ8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
Motorized Rotation Mounts and Stages with Tapped Platforms
Item # PRMTZ8(/M)a ELL18(/M)b
Click Photo
to Enlarge
Features Tapped Mounting Platform for Mounting Prisms or Other Optics Tapped Mounting Platform, Open Frame Design for OEM Applications
Additional Details
  • This stage is available in the KPRM1E(/M), which includes the PRMT1Z8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
  • This stage is available in the ELL18K(/M), which includes an interface board, mounting brackets, and connectors for PC control.
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Mini-Series Continuous Rotation Mount for Ø1/2" Optics

Mini-Series Rotation MountClick to Enlarge
View Imperial Product List
Item #QtyDescription
MRM051Mini-Series Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, 4-40 Mounting Stud
LPVISE050-A1Ø1/2" Linear Polarizer with N-BK7 Windows, 400-700 nm
MS1R1Mini-Series Optical Post, Ø6 mm, L = 1"
View Metric Product List
Item #QtyDescription
MRM05/M1Mini-Series Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, M3 Mounting Stud
LPVISE050-A1Ø1/2" Linear Polarizer with N-BK7 Windows, 400-700 nm
MS1R/M1Mini-Series Optical Post, Ø6 mm, L = 25 mm
Linear Polarizer Mounted into the MRM05(/M)
  • Mount Ø1/2" Optics up to 5.8 mm Thick
  • Compact Size: 0.81" x 0.78" x 0.44" (20.7 mm x 19.8 mm x 11 mm) [L x W x H]
  • Internal SM05 (0.535"-40) Threading for Compatiblity with SM05 Lens Tubes
  • One SM05RR Retaining Ring Included
  • Post Mountable via 4-40 (M3) Factory-Installed Stud

The MRM05(/M) mount is a lockable, continuous rotation mount for Ø1/2" optics. The mount features full 360° rotation of the mounting carriage, with a marking at every 2° engraved on the circumference of the carriage. The back of the mounting carriage has a knurled edge for easy grip. A setscrew with a 0.05" (1.3 mm) hex is located on top for locking the rotational position. The center aperture is SM05-threaded (0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 5.8 mm thick. Optics are held in the mount with an included SM05RR retaining ring, which can be adjusted with an SPW603, SPW603L, or SPW801 spanner wrench. These mounts are designed to provide a 10 mm optic axis height when measured from the bottom of the mount to match our Mini-Series Kinematic Mounts.

The MRM05(/M) has a 4-40 (M3 x 0.5) mounting stud for post mounting, making this mount compatible with our Mini-Series Optical Post Assemblies. The mounting stud has a length that is optimal for mounting into posts, but can be removed if desired. The mounting hole has a depth of 0.09" (2.3 mm); caution should be taken in choosing a setscrew with the correct length, as damage to the part can occur.

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MRM05 Support Documentation
MRM05Mini-Series Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, 4-40 Mounting Stud
$101.77
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MRM05/M Support Documentation
MRM05/MMini-Series Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, M3 Mounting Stud
$101.77
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Continuous Rotation Mount for Ø1/2" Optics

  • Mount Ø1/2" Optics up to 0.23" (5.8 mm) Thick
  • Compact: 1.00" x 0.87" x 0.45" (25.4 mm x 22.1 mm x 11.4 mm) [L x W x H]
  • Internal SM05 (0.535"-40) Threading for Compatability with SM05 Lens Tubes
  • One SM05RR Retaining Ring Included
  • Post Mountable via 8-32 (M4) Mounting Tap

With a 1.00" (25.4 mm) height and a 0.45" (11.4 mm) thickness, the RSP05(/M) Ø1/2" rotation mount is an ideal solution for compact optical assemblies. The center aperture accepts Ø1/2" optics up to 0.23" thick (5.8 mm), held in place with a SM05RR retaining ring (one included with RSP05). The knurled edge of the RSP05(/M) and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. A convenient top-located setscrew can be tightened with a 1/16" (1.5 mm) hex key or balldriver to secure the rotational position of the mount.

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RSP05 Support Documentation
RSP05Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, 8-32 Tap
$83.85
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RSP05/M Support Documentation
RSP05/MRotation Mount for Ø1/2" (Ø12.7 mm) Optics, M4 Tap
$83.85
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SM1-Threaded Continuous Rotation Mount for Ø1/2" Optics


Click to Enlarge

View Imperial Product List
Item #QtyDescription
CRM051Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, External SM1 Threads
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
SM1L201SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
CP331SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
View Metric Product List
Item #QtyDescription
CRM051Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, External SM1 Threads
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
SM1L201SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
CP33/M1SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
CRM05 Mount in a 30 mm Cage System

The CRM05 is a lockable, continuous-rotation mount for Ø1/2" optics. The mount features full 360° rotation of the front dial face and a setscrew for locking the rotational position into place. External SM1 threads (1.035"-40) allow the mount to be threaded directly onto any internally SM1-threaded device such as SM1 lens tubes or 30 mm cage cubes. The center aperture is SM05-threaded (0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 0.26" (6.5 mm) thick. Optics are held in the mount with an included SM05RR retaining ring. Two notches along the mount's circumference accommodate the SPW801 adjustable spanner wrench to aid in securing the mount into place.

The knurled edge of the CRM05 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. Four equally spaced witness lines are engraved into the mount's perimeter, ensuring there is always a witness line in a convenient and easily readable position. The mount can be locked into position using the 0.035" hex setscrew on the outer edge.

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CRM05 Support Documentation
CRM05Customer Inspired! Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, External SM1 Threads
$79.00
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SM1-Threaded Continuous Rotation Mount for Ø1" Optics

LRM1 Ø1
Click to Enlarge
View Imperial Product List
Item #QtyDescription
LRM11Rotation Mount for Ø1" (25.4 mm) Optics, External SM1 Threads
LMR11Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
LPNIRE100-B1Ø1" Linear Polarizer with N-BK7 Windows, 600-1100 nm
TR21Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
View Metric Product List
Item #QtyDescription
LRM11Rotation Mount for Ø1" (25.4 mm) Optics, External SM1 Threads
LMR1/M1Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
LPNIRE100-B1Ø1" Linear Polarizer with N-BK7 Windows, 600-1100 nm
TR50/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
A linear polarizer is mounted in the LRM1 continuous rotation mount. This rotation mount can be post mounted by attaching its external SM1 threads to the LMR1(/M) lens mount.
  • Mount Ø1" Optics up to 0.34" (8.6 mm) Thick
  • Internal Bore is SM1 (1.035"-40) Threaded for Compatibility with SM1 Lens Tubes
  • External SM1 Threads for Mounting in SM1 Lens Tubes or 30 mm Cage Cubes
  • One SM1RR Retaining Ring Included
  • Not Post Mountable

The LRM1 is a lockable, continuous-rotation mount for Ø1" optics. The mount features full 360° rotation of the front dial face and a setscrew for locking the rotational position into place. External SM1 threads (1.035"-40) allow the mount to be threaded directly onto any internally SM1-threaded device such as SM1 lens tubes or 30 mm cage cubes. Please note that the LRM1 will not fit inside our 30 mm cage systems. The center aperture is also SM1-threaded and accepts Ø1" (Ø25.4 mm) optics up to 0.34” (8.6 mm) thick. Optics are held in the mount with an included SM1RR retaining ring. We recommend using a spanner wrench for the SM1RR retaining ring to help secure the optic into place. In addition, two notches along the mount's circumference accommodate the SPW801 adjustable spanner wrench to aid in securing the mount into place.

The knurled edge of the LRM1 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. Four equally spaced witness lines are engraved into the mount's perimeter, ensuring there is always a witness line in a convenient and easily readable position. The mount can be locked into position using the 8-32 nylon-tipped setscrew on the outer edge. The setscrew can be adjusted using a 5/64" (2.0 mm) hex key or ball driver.

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LRM1 Support Documentation
LRM1Rotation Mount for Ø1" (25.4 mm) Optics, External SM1 Threads
$102.48
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Continuous Rotation Mount for Ø1" Optics

  • Mount Ø1" Optics up to 0.47" (11.9 mm) Thick
  • Compatible with SM1 Lens Tubes
  • One SM1RR Retaining Ring Included
  • Post Mountable via an 8-32 (M4) Tapped Hole

The RSP1(/M) Continuous Rotation Mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.47" (11.9 mm) thick. Secure the optic with the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

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RSP1 Support Documentation
RSP1Rotation Mount for Ø1" (25.4 mm) Optics, 8-32 Tap
$98.42
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RSP1/M Support Documentation
RSP1/MRotation Mount for Ø1" (25.4 mm) Optics, M4 Tap
$98.42
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Dual, Continuous Rotation Mount for Ø1" Optics


Click to Enlarge

View Imperial Product List
Item #QtyDescription
DLM11Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, 8-32 Tap
TR11Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1"
CPTS201Cage Plate to Ø1/2" Post Adapter, 20 mm Post Offset, Imperial Thumbscrew
ER2-P41Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
CP08FP1FiberPort Adapter for 30 mm Cage System, Enhanced Clamping
PAFA-X-4-A1Achromatic FiberPort, FC/PC & FC/APC, f = 4.00 mm, 400 - 700 nm, Ø0.65 mm Waist
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH2E1Ø1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=2.19"
View Metric Product List
Item #QtyDescription
DLM1/M1Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, M4 Tap
TR20/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 20 mm
CPTS20/M1Cage Plate to Ø1/2" Post Adapter, 20 mm Post Offset, Metric Thumbscrew
ER2-P41Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
CP08FP/M1FiberPort Adapter for 30 mm Cage System, Enhanced Clamping, Metric
PAFA-X-4-A1Achromatic FiberPort, FC/PC & FC/APC, f = 4.00 mm, 400 - 700 nm, Ø0.65 mm Waist
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH50E/M1Ø12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=54.7 mm
Dual Rotation Mount Integrated in a 30 mm Cage System using CPTS20 Adapter

Click to Enlarge

The rotating optic carriages can be easily removed from the main body of the mount.
  • Mount Two Ø1" Optics up to 0.25" (6.4 mm) Thick
  • Each Optic Carriage Rotates Independently
  • Rotating Optic Carriages are Interchangeable for Quick Swapping
  • SM1-Threaded Optic Bore in Each Rotating Optic Carriage
  • Two SM1RR Retaining Rings Included
  • Post Mountable via 8-32 (M4) Tap

The DLM1(/M) Dual Rotation Mount includes two independently rotating carriages (item # DLM1-A) for Ø1" optics that offer 360° of continuous rotation. The optic bore of each carriage features internal SM1 (1.035"-40) threading and can hold an optic up to 0.25" (6.4 mm) thick with the included SM1RR retaining ring. The carriages magnetically attach to the main body of the mount. To remove a carriage from the mount, simply pull the carriage off the main body. Another carriage can then be snapped on in its place. Extra DLM1-A interchangeable rotating carriages are available to allow optics to be swapped out quickly and easily.

Each carriage has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments for precise, repeatable positioning. Two top-located setscrews can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the optic carriages independently. When the rotation is locked, the double bore on the mount maintains a stable, three-point contact to hold the optic carriage.

The DLM1 mount is designed to put the optic axis 1.00" above the top of the post. The DLM1/M puts the optic axis 25.0 mm above the top of the post. When two optics are mounted, the separation between them is 0.30" (7.6 mm). The dual rotation mount is ideal for creating variable polarizers and attenuators by mounting linear polarizers and wave plates in close proximity without having to align the optic axes of two separate rotation mounts. We do not recommend using this mount with lens tubes, as the torque applied to the optic bore may overcome the magnetic attachment. Optics in SM1-threaded housings can be mounted to the carriage.

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DLM1 Support Documentation
DLM1Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, 8-32 Tap
$145.58
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DLM1-A Support Documentation
DLM1-AInterchangeable Rotating Carriage for DLM1(/M), One SM1RR Retaining Ring
$34.95
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DLM1/M Support Documentation
DLM1/MDual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, M4 Tap
$145.58
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Continuous Rotation Mount for Ø1" Optics with Adjustable Zero


This animation shows the movable scale of the Ø2" RSP2D Mount being rotated to align with the fast axis of a wave plate.
  • Mount Ø1" Optics up to 0.51" (12.9 mm) Thick
  • Dial Face Can Be Rotated Independently of Mounted Optics
  • 5 arcmin Vernier Scale
  • Compatible with SM1 Lens Tubes
  • One SM1RR Retaining Ring Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP1D(/M) Ø1" Continuous Rotation Mount offers the same features as the RSP1(/M) featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP1 above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.51" (12.9 mm) thick. Secure the optic's position using the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. The front dial scale can be unlocked and rotated using a 5/64" (2.0 mm) hex key so that the scale can be aligned to the axis of an optic for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

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RSP1D Support Documentation
RSP1DRotation Mount for Ø1" (Ø25.4 mm) Optics with Adjustable Zero, 8-32 Tap
$110.18
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RSP1D/M Support Documentation
RSP1D/MRotation Mount for Ø1" (Ø25.4 mm) Optics with Adjustable Zero, M4 Tap
$110.18
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Lens Tube Continuous Rotation Mount for Ø1" Optics

This animation shows the CLR1 being installed in an SM1 lens tube setup. The wave plate installed in the CLR1 rotates, while the lens tubes remain stationary.

Click to Enlarge

The CLR1 allows an optic to rotate between two fixed SM1 lens tubes.
  • Holds Ø1" Optics up to 0.50" (12.7 mm) Thick
  • Ideal for Round Cylindrical Lenses
  • Rotationally Align Optics Within a Lens Tube System
  • Post Mountable via 8-32 (M4) Tapped Hole
  • Features SM1 Quick Release Adapter on Back of Mount

The CLR1(/M) is a rotation mount designed for use with Ø1" round cylindrical lenses and other rotationally sensitive optics within a lens tube system. As round cylindrical lenses only focus or expand light in one dimension, they are not easily aligned within a standard lens mount or lens tube. This rotation mount can be sandwiched between two lens tubes to provide rotation of the mounted optic without disturbing the attached lens tubes.

The back side of this mount utilizes an SM1 (1.035"-40) quick release adapter, which allows the mount to be quickly disconnected and reconnected to a lens tube setup. Please note that this adapter must be removed while inserting an optic in the mount, but once the optic is mounted, the adapter can be reattached. A convenient top-located setscrew can be tightened with a 0.05" (1.3 mm) hex key or balldriver to secure the rotational position of the mount.

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CLR1 Support Documentation
CLR1Rotatable Ø1" (Ø25.4 mm) Lens Mount, 8-32 Tap
$112.46
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CLR1/M Support Documentation
CLR1/MRotatable Ø1" (Ø25.4 mm) Lens Mount, M4 Tap
$112.46
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Indexing Rotation Mounts for Ø1" Optics

This animation shows the movable scale of the RSP1X15 being rotated to align with the fast axis of a wave plate; it also shows the engagement of the indexing mechanism.
  • Directly Mounts Ø1" Optics up to 0.50" (12.7 mm) Thick
  • Scale can be Rotated Independently of Mounted Optic for Alignment
  • Switch Between Continuous and Discrete Rotation
    • RSP1X15(/M): Discrete Rotation in 15° Increments
    • RSP1X225(/M): Discrete Rotation in 22.5° Increments
  • 5 arcmin Vernier Scale is Ideal for Polarization Optics
  • One SM1RR Retaining Ring Included
  • Post Mountable via 8-32 (M4) Tap

The RSP1X15(/M) and RSP1X225(/M) rotation mounts for Ø1" optics feature both continuous 360° rotation and stepped rotation in increments of 15° for the RSP1X15(/M) or 22.5° for the RSP1X225(/M). The top of each mount has a setscrew that, when loosened with a 5/64" (2.0 mm) hex key or balldriver, allows for smooth, continuous, 360° rotation. Tightening the setscrew engages a detent mechanism that forces the mount to rotate in discrete increments. The mounted optic is retained in the central SM1-threaded (1.035"-40) bore using the included SM1RR retaining ring.

In addition, the engraved scale can be unlocked and rotated independently of the optic so that the markings can be aligned with respect to the mounted optic. For example, the zero of the engraved scale can be aligned with the fast axis of a wave plate or the polarization axis of a linear polarizer. To help with the alignment, an engraved arrow extends the zero mark all the way to the outside edge of the SM1-threaded bore used to mount the optic. This animation to the right details the operation of the RSP1X15.

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RSP1X15 Support Documentation
RSP1X15Rotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 15° Indexed Rotation, 8-32 Tap
$155.62
3 weeks
RSP1X225 Support Documentation
RSP1X225Rotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 22.5° Indexed Rotation, 8-32 Tap
$155.62
Today
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RSP1X15/M Support Documentation
RSP1X15/MRotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 15° Indexed Rotation, M4 Tap
$155.62
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RSP1X225/M Support Documentation
RSP1X225/MRotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 22.5° Indexed Rotation, M4 Tap
$155.62
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Continuous Rotation Mount for Ø2" Optics

  • Mount Ø2" Optics up to 0.51" (13 mm) Thick
  • Compatible with SM2 Lens Tubes
  • One SM2RR Retaining Ring Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP2(/M) Continuous Rotation Mount utilizes two precision bearings for smooth rotation. The aperture features internal SM2 (2.035"-40) threading and accepts Ø2" optics up to 0.51" (13 mm) thick as well as any SM2-threaded component. Secure the optic using the included SM2RR retaining ring.

The mount has a knurled edge for rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RSP2 Support Documentation
RSP2Rotation Mount for Ø2" (Ø50.8 mm) Optics, 8-32 Tap
$187.68
Today
+1 Qty Docs Part Number - Metric Price Available
RSP2/M Support Documentation
RSP2/MRotation Mount for Ø2" (Ø50.8 mm) Optics, M4 Tap
$187.68
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Continuous Rotation Mount for Ø2" Optics with Adjustable Zero


This animation shows the movable scale of the RSP2D Mount being rotated to align with the fast axis of a wave plate.
  • Mount Ø2" Optics up to 0.54" (13.7 mm) Thick
  • Dial Face can be Rotated Independently of Mounted Optics
  • 5 arcmin Vernier Scale
  • Compatible with SM2 Lens Tubes
  • One SM2RR Retaining Ring Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP2D(/M) Ø2" Continuous Rotation Mount offers the same features as the RSP2 featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP2(/M) above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM2 threading (2.035"-40) and accepts Ø2" optics up to 0.54" (13.7 mm) thick. Secure the optic's position using the included SM2RR retaining ring. The SM2 threading also provides a means to connect SM2 lens tubes and other Thorlabs components to the mount.

This mount has a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. The front dial scale can be unlocked and rotated using a 5/64" (2.0 mm) hex key so that the scale can be aligned to the axis of an optic for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RSP2D Support Documentation
RSP2DRotation Mount for Ø2" (Ø50.8 mm) Optics with Adjustable Zero, 8-32 Tap
$168.70
Today
+1 Qty Docs Part Number - Metric Price Available
RSP2D/M Support Documentation
RSP2D/MRotation Mount for Ø2" (Ø50.8 mm) Optics with Adjustable Zero, M4 Tap
$168.70
Today
Last Edited: Sep 11, 2013 Author: Dave Gardner