Manual Rotation Mounts, High Precision

Continuous 360° Rotation
Fully Compatible with Our Lens Tubes and Accessories
Ideal for Ø1/2", Ø1", or Ø2" Polarization Optics

Laser-Engraved
Vernier Scale

PRM1

Precision
Rotation Mount

PRM05

Post Not Included

PRM1 Precision
Rotation Mount with
SM1PM10 Prism
Mounting Hardware

Also Available for
PRM05, See Below

Application Idea

Related Items

Motorized Rotation Stage

Lens Tubes

Polarizers

Wave Plates

Precision Rotation Platform

Cage System

Imperial and Metric Part Differences

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Overview
Vernier Scales
Feedback
Rotation Mounts and Stages

Features

Manual High-Precision Rotation Mounts for Ø1/2", Ø1", or Ø2" Optics
360° of Continuous Coarse Rotation
Fine Rotation over ±7° Rotation Dial is Locked
Vernier Scale with Two Resolution Options

10 arcmin (PRM05 and PRM05GL5)
5 arcmin (PRM1, PRM1GL10, and PRM2)

Fully Compatible with Our Lens Tubes
Motorized Rotation Mount also Available

These high-precision rotation mounts combine 360° of coarse manual rotation with precise, backlash-free fine adjustment. These mounts are compatible with Ø1/2", Ø1", or Ø2" optics, as well as Thorlabs' SM05 (0.535"-40), SM1 (1.035"-40), or SM2 (2.035"-40) lens tubes, respectively. The PRM1 and PRM2 Ø1" and Ø2" mounts are also compatible with our cage systems. The 30 mm cage system can be attached to the PRM1, and the 60 mm cage system can be attached to the PRM2.

The rotation dial features a laser-engraved scale, a knurled edge for smooth coarse rotation, and a locking mechanism. When the locking mechanism is engaged, the mount's rotation can then be adjusted via a fine drive adjuster located at the top of the mount (see below for item-specific rotation and locking information). These rotation mounts can be secured to our Ø1/2" posts via a bottom-located 8-32 (M4) tapped hole.

Please see the Rotation Mounts and Stages tab for our entire selection of rotation mounts and stages.

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 tool measures).

Reading a Vernier Scale

Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scale on Thorlabs' rotation mounts). A vernier scale has found common use in many precision measurement tools, the most common being calipers and micrometers. The direct vernier scale uses two scales side-by-side: the main scale and the vernier scale. The vernier scale has a slightly smaller spacing between its tick marks (10% smaller than the main). 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 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 tool.

The 0 on the vernier scale is the "pointer" (marked by a red arrow in Figs. 1 - 3) 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 vernier 0 lines up with the main scale’s 75.6, the reading from Figure 1 is 75.60 (in whatever units the tool measures in).

That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement tool. To expound, let’s look at Figure 2. Here we see that the pointer is no longer aligned with a scale line, instead it is slightly above 75.6, but 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 the vernier scale is 10% smaller than the main scale, moving 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 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier 7 is very slightly above the main scale mark, and we can see that the vernier 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 tool.

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. All vernier scales, direct or retrograde, are read in the same fashion.

Click to Enlarge
Figure 2: An Example of a vernier scale. The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.

Click to Enlarge
Figure 3: An Example of a vernier scale. 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.

Posted Comments:

user (posted 2021-07-14 05:02:39.57)

I lost the 4-40 set screw for the PRM05/M precision mount. Do you know which of the set screws available at Thorlabs can be used to replace it? Thank you.

YLohia (posted 2021-07-15 11:03:48.0)

Hello, we're sorry to hear that you've lost the component screw in the PRM05/M. The SS4N013 screw can be used to replace this.

user (posted 2018-01-02 18:44:55.69)

The gap between the scale and vernier is too large to permit accurate reading, even when viewed at a glancing angle.

tfrisch (posted 2018-01-03 02:48:47.0)

Thank you for contacting Thorlabs. I have posted your note in our internal engineering forum. Please reach out to us at TechSupport@Thorlabs.com if you would like to elaborate on your feedback.

jacterry40 (posted 2017-03-23 14:33:41.75)

I see you give a figure for resolution for the resolution of the PR1 of 2.4 arcmin. Do you have a similar figure for the PRM05? I'm not bothered about reading the scale, just interested in what the smallest angular movement is likely to be. Looking for around a mrad or better.

jlow (posted 2017-03-24 03:49:05.0)

Response from Jeremy at Thorlabs: This is highly dependent on the person using the mount. An experienced person should be able to move a couple mrad easily.

g.c (posted 2015-07-16 14:38:18.89)

We have one of your manual rotation mounts and for the life of me, I can't figure out if it's working properly. It is my understanding that, if I turn the micrometer head,it's suppose to rotate the graduated dial accordingly. In addition,the spring-loaded locking screw is quite strong and when I try sliding it,it doesn't do anything other than spring back; I can't get it to lock.Even if I did, is it suppose to engage the micrometer? If so, it ain't working. At any rate, I'd appreciate if you could you could provide me with an instruction manual in PDF format so that students and I can be properly informed on how to use it withing damaging it. Thanks George

besembeson (posted 2015-09-23 01:12:35.0)

Response from Bweh at Thorlabs USA: The micrometer head is used for fine adjustment only after the locking screw is engaged. Once locked, the micrometer mechanism provides fine adjustment of locked platform. The slot on the locking screw provides the travel range for the fine adjustment so you should not forcefully slide that or stretch the spring as this will be returned. To use the stage, you manually rotate the mounting platform to desired orientation, lock that position (by screwing the locking knob clockwise), then use the micrometer for fine adjustment. Please feel free to call or contact me at techsupport@thorlabs.com if you need further clarification.

drahmlow (posted 2015-05-11 12:05:56.65)

The PRM1GL10 specifically mentions being used with the Glan-Laser or Glan-Taylor polarizers; is there any reason it wouldn't work with a 10 mm PBS cube?

cdaly (posted 2015-05-12 03:47:03.0)

Response from Chris at Thorlabs: Yes, the 10mm Glan Laser and Glan Taylor polarizers are in housings which make the items have an overall size of 15.9mm. The 10mm unmounted PBS cube would not fit securely in the mount.

cdaly (posted 2012-11-27 08:54:57.98)

Response from Chris at Thorlabs: Thank you for using the feedback feature. The lowest profile rotation mount is going to be the nested optical mount, a combination of both LM1-A and LM1-B, which will give an overall thickness of just over 13 mm. As this is purely manual adjustment, you may want to instead consider using a 2" rotation mount with an SM2A6 adapter. The mount itself would still be of a thickness around 20 mm or so, but the clear aperture would be larger at 45 degrees.

ian.craig (posted 2012-11-15 12:32:52.947)

I have been looking for, but unable to find, a low profile rotation stage. I have a nonlinear crystal in a 1" round mount that I need to be able to hit at an oblique angle while also being to rotate it to hit the optimum crystal orientation. The thinnest rotation mount I've been able to find has been about 16mm thick, and most are closer to 19mm. When trying to pass a beam through at 45 degrees, this leaves almost zero clear aperture. Is it possible to construct a low profile rotation mount that is 10mm thick or less (the thinner the better), more in line with the thickness of an LMR1?

bdada (posted 2012-02-02 19:25:00.0)

Response from Buki at Thorlabs.com Thank you for participating in our feedback forum. This request has come up before so I will check with our design team for a status update and post a response when I have more information. Please contact TechSupport@thorlabs.com if you have any questions.

alexandra.nemeth (posted 2012-02-02 07:39:55.0)

I would need a high precision rotation mount for Ø2" optics. Do you plan to launch such a product in the near future?

jjurado (posted 2011-07-14 14:58:00.0)

Response from Javier at Thorlabs to wallon.nogueira: We offer a variety of gimbal mounts which are designed to allow rotation of an optic about a point. These mounts feature different adjustment ranges, as well as different body types: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=2857 I will contact you directly for further assistance.

wallon.nogueira (posted 2011-07-13 17:57:21.0)

Dear Sr(a). Is there a rotation mount that allows also the control of the horizontal and vertical angles? Thank you in advance. Best regards, Wallon

Tyler (posted 2008-09-30 12:20:08.0)

A response from Tyler at Thorlabs to acable: The pictures on this page have been reshot to maximize their clarity. In addition, the picture of each part on our product page (click on the hyperlinked part number in the table where the price is listed) can now be "zoomed" in on for a larger view. In addition, we can provide even larger resolution images of all of our products by request. Simply use this feedback form or email tech support a list of images that you would like to have. Thank you for taking the time to comment on the photographs on this page.

acable (posted 2007-12-17 19:37:47.0)

It would be nice to have the PRM05 and PRM05GL5 photos that appear with the price boxes enlarged. In general, the large the photo, the easier they are to read and since we all depend a the photos to understand the product it would be great if a little more care would go into this part of the Thorlabs website. See the PRM1, that photo is fairly large, but by airbrushing out a little more post even this photo could be increased by 5%. Now compare the PRM1GL10, with the part number under the part the size of the photo is limited.

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 CT1 Cage Translator Stage and 1/4" Translation Stages^b
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 CT1 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
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)	CRM1(/M)	CRM1L(/M)	CRM1PT(/M)	KS1RS	K6XS
Click Photo to Enlarge
Features	Optic Carriage Rotates Within Mounting Ring	30 mm Cage-Compatible^a	30 mm Cage-Compatible for Thick Optics^a	30 mm Cage-Compatible with Micrometer^a	±4° Kinematic Tip/Tilt Adjustment Plus Rotation	Six-Axis Kinematic Mount^a
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)	LCRM2(/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

Manual Rotation Stages

Manual Rotation Stages
Item #	RP005(/M)	PR005(/M)	MSRP01(/M)	RP01(/M)	RP03(/M)	QRP02(/M)
Click Photo to Enlarge
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)	PDR1(/M)	K10CR1(/M)	PRM1Z8(/M)^a	DDR100(/M)	ELL14	HDR50(/M)
Click Photo to Enlarge
Features	Compatible with SM05 Lens Tubes, 16 mm Cage System, 30 mm Cage System	Compatible with SM05 Lens Tubes, 30 mm Cage System, PD1(/M) and PDX1(/M) Linear Stages	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

Motor Type	Brushless DC Servo	Piezo Inertia Drive	2 Phase Stepper Motor with Worm Gear	DC Servo	Brushless DC Servo	Piezo Resonant Motor	2 Phase Stepper Motor with Worm Gear
Rotation Adjustment Range	360° Continuous
Rotating Platform/Carriage
Diameter	Ø1.14" (Ø29.0 mm)	1.34" (34.0 mm)	Ø1.81" (Ø46.0 mm)	Ø1.97" (Ø50.0 mm)	Ø4.37" (111.0 mm)	-	Ø3.86" (Ø98.0 mm)
Height	1.12" (28.5 mm)	0.71" (18.0 mm)	0.84" (21.5 mm)	0.91" (23.0 mm)	1.57" (39.9 mm)	0.59" (15.1 mm)	1.73" (44.0 mm)
Threaded Mounting Holes	Four 4-40 with 16 mm Spacing	Four 8-32 (M4)	Six 4-40 (M3)	Four 6-32 (M4), Four 8-32 (M4), Four 4-40 with 30 mm Spacing	Eight 8-32 (M4), Four 1/4"-20 (M6), Four 4-40 with 16 mm Spacing, Four 4-40 with 30 mm Spacing	-	Four 8-32 (M4)
Center Aperture	SM05 Internal Threads, 1.2" (28.5 mm) Deep	Ø9.0 mm Clear Aperture with SM05 Internal Threads, 2.5 mm Deep	SM1 Internal Threads, 0.84" (21.5 mm) Deep	SM1 Internal Threads, 0.91" (23.0 mm) Deep	SM1 Internal Threads, 0.82" (21.0 mm) Deep	SM1 Internal Threads, 0.58" (14.7 mm) Deep	Ø50.0 mm Clear Aperture with SM1 Internal Threads, 6.9 mm Deep
Speed (Max)	1800°/s	20°/s	10°/s	25°/s	1080°/s	430°/s	50°/s
Platform Adapter Plate(s)	-	-	K10CR1A2(/M)	PRM1SP1(/M)	NR360SP9(/M) NR360SP4(/M)	-	NR360SP9(/M) NR360SP8 NR360SP4(/M)
Base
Dimensions	2.19" x 2.19" (55.6 mm x 55.6 mm)	1.57" x 1.57" (40.0 mm x 40.0 mm)	4.21" x 2.60" (107.0 mm x 66.0 mm)	5.18" x 3.26" (131.5 mm x 82.8 mm)	4.53" x 4.53" (115 mm x 115 mm)	2.60" x 3.25" (66.0 mm x 82.5 mm)	7.46" x 4.55" (189.4 mm x 115.5 mm)
Stage Adapter Plates	-	-	K10CR1A1 K10CR1A3	PRM1SP2 PRM1SP3	-	-	NR360SP2(/M) NR360SP5(/M)
Bottom Surface Mounting Holes	-	Two 8-32 (M4)	-	Two 1/4" (M6) Counterbores	Four 1/4" (M6) Clearance Holes	-	Four 1/4" (M6) Counterbores
Side Holes for Vertical Mounting	Four 8-32 (M4) Eight 4-40	One 8-32 (M4), Two Sides	Three 8-32 (M4)	Four 8-32 (M4)	Eight 1/4"-20 (M6)	-	Six 1/4"-20 (M6)
Cage System Compatibility	Four 4-40 Holes on Back Side with 16 mm Spacing, Four 4-40 Taps on Front Side with 30 mm Spacing	Ø6 mm Holes for ER Cage Rods with 30 mm Spacing	Four 4-40 Holes on Each Side with 30 mm Spacing	-	Four 4-40 Holes on Back Side with 30 mm Spacing	60 mm Cage using Four 0.12 (3.0 mm) Holes for 4-40 Screws, 30 mm Cage using SR025 Cage Rods to Adapt to ER Cage Rods	-

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.

High-Precision Rotation Mount for Ø1/2" Optics

High-Precision Rotation Mount for Ø1/2in Optics

Zoom

Half Inch Rotation Mount Mechanical Drawing

Click for Details
PRM05(/M) Mechanical Drawing

Accepts Ø1/2" (Ø12.7 mm) Optics up to 0.23" (5.9 mm) Thick
360° Continuous Coarse Rotation
Direct Read 2° Graduations Engraved on the Edge of the Rotation Dial
±7° of Fine Adjuster-Driven Rotation when Locked
Vernier Scale with 10 arcmin Resolution
Ideal for Ø1/2" Polarization Optics
Compatible with our SM05 Lens Tubes
One Retaining Ring (SM05RR) Included
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The PRM05(/M) high-precision rotation mount for Ø1/2" optics combines 360° of continuous coarse manual rotation with precise, backlash-free adjustment. The SM05 (0.535"-40) threaded inner bore accepts Ø1/2" optics up to 0.23" (5.9 mm) thick as well as any of our SM05-threaded components. Optics are secured between the rear lip and one SM05RR retaining ring, which is included with each mount.

The edge of the rotation dial features a laser-engraved scale marked at 2° increments and can be coarsely rotated manually using the knurled ring located on the rear of the mount (see drawing to the right). Values read from the vernier scale can be converted to arcmins by multiplying by a factor of two. The 4-40 setscrew, which is inset into the side of the body of the mount, locks the dial face and engages the adjuster screw for fine rotation. When locked, the adjuster provides ±7° of rotation.

The PRM05(/M) is ideal for mounting our SM05PM5 polarizing prism mount, which features compatible SM05 threading. The cover on the SM05PM5 can be rotated, thereby allowing the user to block the two side ports when they are not required. The PRM05(/M) can be purchased bundled with our SM05PM5 (Item# PRM05GL5(/M) below). Together, they provide 360° of high precision rotation for either our 5 mm Glan-Laser or Glan-Taylor Polarizer.

Ø1/2" High-Precision Rotation Mount with Polarizing Prism Mount

Ø1/2in High-Precision Rotation Mount with Polarizing Prism Mount

Zoom

PRM05(/M) Ø1/2" Rotation Mount Bundled with the SM05PM5 Prism Mount
360° Continuous Coarse Rotation
Direct Read 2° Graduations on Main Dial
±7° of Fine Adjuster-Driven Rotation when Locked
Vernier Scale with 10 arcmin Resolution
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The PRM05GL5(/M) consists of our PRM05 rotation mount (featured above) and an SM05PM5 polarizing prism mount. The SM05PM5, which features external SM05 threading, is directly compatible with the PRM05. Its rotating cover allows the user to block the two side ports when they are not required. The PRM05GL5(/M) provides 360° of high-precision rotation for our either our 5 mm Glan-Laser or Glan-Taylor Polarizer (sold separately).

High-Precision Rotation Mount for Ø1.00" Optics

High-Precision Rotation Mount for Ø1.00in Optics

Zoom

One Inch Rotation Mount Mechanical Drawing

Click for Details

Accepts Ø1" (Ø25.4 mm) Optics up to 0.50" (12.7 mm) Thick
360° Continuous Coarse Rotation
Direct Read 1° Graduations Engraved on Rotation Dial Face
When Locked, Micrometer Driven ±7° of Fine Rotation
Vernier Resolution: 5 arcmin
Compatible with our SM1 Lens Tubes and 30 mm Cage System
One SM1RR Retaining Ring Included
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The PRM1(/M) high-precision rotation mount for Ø1" optics combines 360° of continuous manual rotation with precise, backlash-free micrometer adjustment. The SM1 (1.035"-40) threaded inner bore accepts Ø1" optics up to 0.50" (12.7 mm) thick as well as any of our SM1-threaded components. Optics are secured with one SM1RR retaining ring, which is included with each mount.

The rotation dial face features a laser-engraved scale marked at 1° increments and can be rotated manually using the knurled outer surface (see drawing to the right). The thumbscrew, located on the lower right side of the mount, locks the dial face and engages the micrometer for fine adjustment. When locked, the micrometer provides ±7° of rotation at approximately 2.4 arcmin per micrometer division.

The PRM1(/M) is ideal for mounting either our SM1PM10 or SM1PM15 Polarizing Prism Mounts, both of which feature compatible SM1 threading. It can be purchased bundled with our SM1PM10 (Item# PRM1GL10(/M) below). Together they provide 360° of high precision rotation for either our 10 mm Glan-Laser or Glan-Taylor Polarizer (sold separately).

The PRM1(/M) is also compatible with our 30 mm cage system. The cage system can be mounted to the unit using ER cage assembly rods attached to the four 4-40 tapped holes located on the rotation dial face (there are no 4-40 tapped holes on the back of the mount). When using this product the entire 30 mm cage system will be rotated, not just the optic. Pairing this with our CPU1 Rotating Cage Plate will allow for a rotating cage segment between the PRM1 and a fixed cage system.

Ø1.00" High-Precision Rotation Mount with Polarizing Prism Mount

Ø1.00in High-Precision Rotation Mount with Polarizing Prism Mount

Zoom

PRM1(/M) Ø1" Rotation Mount Bundled with the SM1PM10 Prism Mount
360° Continuous Coarse Rotation
Direct Read 1° Graduations on Main Dial
±7° of Micrometer-Driven Fine Rotation when Locked
Vernier Scale with 5 arcmin Resolution
Compatible with our 30 mm Cage System
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The PRM1GL10(/M) bundles our PRM1(/M) rotation mount featured above with our SM1PM10 polarizing prism mount. The SM1PM10, which features external SM1 threading, is directly compatible with the PRM1(/M). Its rotating cover allows the user to block the two side ports when they are not required. The PRM1GL10(/M) provides 360° of high-precision coarse rotation for either our 10 mm Glan-Laser or Glan-Taylor Polarizer (sold separately).

The PRM1GL10(/M) is also compatible with our 30 mm cage system. The cage system can be mounted to the unit using ER cage assembly rods attached to the four 4-40 tapped holes on the rotation dial face (there are no 4-40 tapped holes on the back of the mount). When using this product, the entire 30 mm cage system will be rotated, not just the optic. Pairing this with our CPU1 Rotating Cage Plate will allow for a rotating cage segment between the PRM1 and a fixed cage system.

High-Precision Rotation Mount for Ø2.00" Optics

High-Precision Rotation Mount for Ø2.00in Optics

Zoom

Two Inch Rotation Mount Mechanical Drawing

Click for Details

Accepts Ø2" (Ø50.8 mm) Optics up to 0.48" (12.2 mm) Thick
360° Continuous Coarse Rotation
Direct Read 1° Graduations Engraved on Rotation Dial Face
±7° of Micrometer-Driven Fine Rotation when Locked
Vernier Scale with 5 arcmin Resolution
Compatible with our SM2 Lens Tubes and 60 mm Cage System
One SM2RR Retaining Ring Included
Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The PRM2(/M) high-precision rotation mount for Ø2" optics combines 360° of continuous coarse manual rotation with precise, backlash-free micrometer adjustment. The SM2-threaded (2.035"-40) inner bore accepts Ø2" optics up to 0.48" (12.2 mm) thick as well as any of our SM2-threaded components. Optics are secured with one SM2RR retaining ring (included with each mount).

The PRM2(/M) is also compatible with our 60 mm cage system. The cage system can be mounted to the unit using ER cage assembly rods attached to the four 4-40 tapped holes located on the rotation dial face or the four 4-40 tapped holes located on the back side of the mount. The cage system attached to the back of the mount does not rotate.

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous			Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°	Manual, 360° Continuous
Optic Mounting	Internally SM05-Threaded Carriage
Maximum Accepted Optic Thickness	0.23" (5.8 mm)	0.23" (5.8 mm)	0.26" (6.5 mm)	0.23" (5.9 mm)	0.24" (6.0 mm)	0.41" (10.4 mm)	0.29" (7.3 mm)
Post Mounting	4-40 (M3) Stud	8-32 (M4) Tap	None	8-32 (M4) Tap	None	Two Counterbores for 8-32 (M4) Cap Screws	Two Counterbores for 4-40 (M3) Cap Screws
Cage System Compatibility	N/A				Four Bores for ∅4 mm Cage Rods with 16 mm Spacing	N/A	N/A^c

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous					Manual, Continuous: 360°; Discrete: 15°	Manual, Continuous: 360°; Discrete: 22.5°	Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°
Optic Mounting	Internally SM1-Threaded Carriage
Maximum Accepted Optic Thickness	0.47" (11.9 mm)	0.34" (8.6 mm)	0.51" (12.9 mm)	0.25" (6.4 mm)	0.27" (6.8 mm)	0.50" (12.7 mm)	0.50" (12.7 mm)	0.50" (12.7 mm)
Post Mounting	8-32 (M4) Tap	N/A	8-32 (M4) Tap
Cage System Compatibility	N/A							Four 4-40 (M3) Taps on Rotation Dial with 30 mm Spacing

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous			Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°	Manual, 360° Continuous
Optic Mounting	Internal SM1 Threads in LM1-A	Internally SM1-Threaded Carriage	Double-Bore with Setscrew	Internally SM1-Threaded Carriage
Accepted Optic Thickness	Max: 0.37" (9.4 mm)	Max: 0.37" (9.4 mm)	Min: 0.31" (7.9 mm)	Max: 0.37" (9.4 mm)	Max: 0.47" (11.9 mm)	Max: 0.55" (14 mm)
Post Mounting	8-32 (M4) Tap in LM1-B	8-32 (M4) Tap			Six Counterbores for 8-32 (M4) Cap Screws
Cage System Compatibility	N/A	Four Bores for ∅6 mm Cage Rods with 30 mm Spacing			N/A

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)	0.51" (13 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

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous
Mounting Platform
Diameter	Ø1.00" (Ø25.4 mm)	Ø1.00" (Ø25.4 mm)	Ø1.40" (Ø35.6 mm)	Ø2.07" (Ø52.8 mm)	Ø4.29" (Ø109.0 mm)	Ø2.00" (Ø50.8 mm)
Height	0.67" (17.0 mm)	0.75" (19.1 mm)	0.51" (13.1 mm)	0.63" (16.1 mm)	0.70" (17.8 mm)	1.00" (25.4 mm)
Taps	Six 4-40 (M3) One 1/4"-20 (M6)	One 8-32 (M4) Eight 4-40 (M3)	Four 4-40 (M3) One 8-32 (M4)	Four 8-32 (M4) One 1/4"-20 (M6)	Eight 6-32 (M4) Sixteen 8-32 (M4) Thirteen 1/4"-20 (M6)	Four 6-32 (M4) Four 8-32 (M4) Five 1/4"-20 (M6)
Additional Holes	Two Ø0.13" (Ø3.2 mm) Holes for FiberBench Accessories	-	Four Clearance Holes for 4-40 (M3) Cap Screws	-	-	-
Platform Adapter Plate(s)	-	-	-	-	-	-
Base
Dimensions	1.50" x 1.50" (38.1 x 38.1 mm)	1.50" x 1.50" (38.1 x 38.1 mm)	1.78" x 1.40" (45.2 x 35.6 mm)	2.45" x 2.45" (62.2 x 62.2 mm)	4.65" x 4.65" (118.1 x 118.1 mm)	2.55" x 2.55" (64.8 x 64.8 mm)
Mounting Holes	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 4-40 (M3) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Counterbores for 1/4"-20 (M6) Cap Screws
Side Taps for Vertical Mounting	-	-	One 4-40 (M3)	One 8-32 (M4)	Three 8-32 (M4)	-
Cage System Compatibility	N/A

Rotation Drive Mechanism and Adjustment Range	Manual: 360° Continuous; Fine: Adjuster Screw, ±5°	Manual: 360° Continuous; Fine: Adjuster Screw, ±5°	Manual: 360° Continuous; Fine: Micrometer, ±5°	Worm Gear, 360° Continuous	Manual, 360° Continuous with 1/2" (13 mm) Linear Travel Along X and Y Axes with Micrometer
Mounting Platform
Diameter	Ø2.21" (Ø56.0 mm)	Ø3.19" (Ø81.0 mm)	Ø2.70" (Ø68.6 mm)	Ø1.70" (Ø43.2 mm)	Ø4.18" (Ø106.0 mm)	Ø4.04" (Ø102.5 mm)
Height	On Breadboard: 0.91" (23.0 mm)^a Dovetail Stacked: 0.83" (21.0 mm)	On Breadboard: 0.91" (23.0 mm)^a Dovetail Stacked: 0.83" (21.1 mm)	1.00" (25.3 mm)	1.00" (25.4 mm)	1.00" (25.4 mm)	1.65" (41.8 mm)
Taps	Thirteen 1/4"-20 (M6) Four 8-32 (M4) Four 6-32 (M4)	Thirteen 1/4"-20 (M6) Four 8-32 (M4) Four 6-32 (M4)	Four 4-40 (M3) Ten 6-32 (M4) Six 1/4"-20 (M6)	Four 4-40 (M3) Eight 6-32 (M4) Four 8-32 (M4)	Eight 4-40 (M3) Twelve 8-32 (M4) Sixteen 1/4"-20 (M6)	-^b
Additional Holes	-	-	Ø0.94" (Ø23.9 mm) Clear Aperture with SM1 Threading	-	Ø0.90" (Ø22.9 mm) Clear Aperture with SM1 Threading	-^b
Platform Adapter Plate(s)	-	-	PR01A(/M) CRA30(/M)	CR1A(/M)	XYR1A	-^b
Base
Dimensions	3.35" x 2.52" (85.0 mm x 63.9 mm)	4.33" x 3.58" (110.0 mm x 91.0 mm)	2.75" x 3.50" (69.9 x 88.9 mm)	2.76" x 2.10" (70.1 x 53.4 mm)	5.50" x 4.42" (139.7 x 112.3 mm) (Not Including Micrometers)
Mounting Holes	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Two Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws
Side Taps for Vertical Mounting	-	-	Two 1/4"-20 (M6)	-	-
Cage System Compatibility	-	N/A	Four 4-40 Taps on Top Surface for 30 mm Cage System	N/A	Four 4-40 Taps on Top Surface for 30 mm Cage System Four 4-40 Taps on Top Surface for 60 mm Cage System Four 4-40 Taps on Bottom Surface for 60 mm Cage System	-^b