Ø1" Lens Tubes


  • Lens Tubes Accept Ø1" (25.4 mm) Optics
  • SM1 Thread Standard Used Throughout Thorlabs' Product Line
  • Designed for Use with Our 30 mm Cage Systems

SM1M10

Internal Threads

SM1S20

External Threads

SM1L05V

Internal and External Threads

SM1L40

Internal and External Threads

SM1L10E

Internal Threads, Optic Retention Lip

SM1L30C

Slotted Lens Tube
(Optic Not Included)

Easily Interfaces with Other Lens
Tube Sizes

SM05

SM1

SM2

SM3

Related Items


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Additional Lens Tube Sizes
Ø1/2"
Ø30 mm
Ø1.5"
Ø2"
Ø3"
Adapters Button

Features

  • Variety of Lens Tubes in Lengths from 0.30" (7.6 mm) to 4.00" (101.6 mm)
    • Standard Lens Tubes
    • Lens Tubes without External Threading
    • Lens Tubes with Optic Retention and No External Threading
    • Lens Tube Spacers without Internal Threading
    • Slotted Lens Tubes for Access to Optics without Disassembly
  • Extension Tube for Optics with Long Focal Lengths
  • Wide Range of SM1 (1.035"-40) Compatible Optomechanical Components
  • Compatible with Our 30 mm Cage Systems
  • Vacuum-Compatible Options Available
  • Lens Tubes Directly Accept Ø1" (Ø25.4 mm) Optics

Lens tubes are ideal for creating compact optical subassemblies with light-tight beam paths. The Ø1" lens tubes sold here can be used to house one or several optical elements, as shown in the diagram of a beam expander below. In addition to the Ø1" lens tubes featured on this page, Thorlabs also offers Ø1/2", Ø30 mm, Ø1.5"Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter. Vacuum-compatible versions of our Ø1/2" and Ø1" stackable lens tubes are available from stock; customers can request vacuum-compatible lens tubes at other lengths and diameters by contacting Tech Support.

Optics are separated and secured by retaining rings at the desired depth within the lens tube using a compatible SM1 spanner wrench, sold below. Each of the lens tubes on this page come with one or two compatible SM-threaded retaining rings with the exception of the internally unthreaded lens tube spacers (Item #'s beginning with SM1S). In addition, Thorlabs offers stress-free and plastic retaining rings for optics which require reduced stress on our Retaining Rings page.

Lens Tube Application Example
Lens Tube Engraving
Click to Enlarge

When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.
Lens Tube Compatible Products
Thread
Adapters
Terminated Fiber
Adapters
Fixed Fiber Collimator
Adapters
Kinematic Fiber Collimator
Adapters
LED Mounts LD Mounts Aspheric Lens Mounts Irises, Apertures, and Shutters Alignment Tools

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"

Posted Comments:
Ian Astley  (posted 2023-12-21 11:14:24.647)
Is it possible to create a SM1L15V? Don't need it for vacuum applications but the non-anodized aluminum is easier to ground in our system and we need 1.5 inches in our lens tube. We've currently been removing the anodized coating from SM1L15 with oven cleaner(NaOH). Would be much easier if we could purchase directly.
ksosnowski  (posted 2023-12-21 03:56:55.0)
Thank you for reaching out to us Ian. The vacuum lens tube models are chemically cleaned and double vacuum-bagged to meet the ratings however we can generally offer lens tubes without the anodization applied as a special item. For custom requests like this you can contact techsupport@thorlabs.com and I have reached out directly to discuss your application further.
Steven Leigh  (posted 2023-09-29 10:41:20.93)
Great product. Could Thorlabs please consider adding two customer-inspired parts -- one is SM1L15C (1.5" thread depth) and the second is SM1L25C (2.5" thread depth)? Thanks!
jdelia  (posted 2023-10-02 02:36:46.0)
Thank you for contacting Thorlabs, and for providing this valuable feedback. I have logged your request in our internal suggestion forum for consideration as a future product line.
Sam Chen  (posted 2023-09-21 19:25:55.067)
what's the spec of following items? what's the standards that you follow? 1. SM1 (Ø1.035-40) SERIES EXTERNAL THREAD 2. SM1 (Ø1.035-40) SERIES INTERNAL THREAD
cdolbashian  (posted 2023-09-25 11:08:16.0)
Thank you for reaching out to us with these inquiries. The standards as well as the threading information can be found above within the "threading specs" tab.
user  (posted 2023-04-13 13:50:37.47)
mech drawing has manual callout for internal thread that is obviously SM05. it's not hard to set up solidworks with preformatted thread forms for all the Thor SM threads; i did it while i was there. it's worth the time, you should try to push mech to do it, it'll prevent errors like this and overall save everyone time and improve accuracy.
jdelia  (posted 2023-04-17 10:18:55.0)
Thank you for contacting Thorlabs. Unfortunately this is not something we provide. The SolidWorks models we provide for our components have cosmetic threads, as real threads consume a large amount of memory within SolidWorks, and are generally not recommended for larger assemblies, as it will slow your computer down drastically. The threading information for our parts can generally be found in the CAD drawings which we offer for download on the website.
Andrey Kuznetsov  (posted 2021-03-22 19:14:15.633)
Could you please make a SM1L03E part as standard offering?
YLohia  (posted 2021-03-23 10:25:02.0)
The SM1L03E is currently a standard/stock offering.
Archie Toribio  (posted 2020-04-01 14:38:06.54)
May I have a RoHS-3 and REACH SVHC-205 CoC for the mfr p/n SM1L03 please? Thanks. Archie Toribio Compliance Analyst Thermofisher Inc.
YLohia  (posted 2020-04-01 03:24:10.0)
Hi Archie, thank you for contacting Thorlabs. We will reach out to you directly.
Colin Stephen  (posted 2020-02-13 04:21:49.513)
Product idea that would be handy. A locking screw on the cover such that once adjusted access requires use of a tool (e.g. Allen key) so that it can be used as part of enclosing a class IIIb or class 4 laser system as class 1.
llamb  (posted 2020-02-13 03:45:24.0)
Thank you for your feedback regarding our SM1L20C slotted lens tube. I will add this to our internal product forum for further discussion.
Timothy Murray  (posted 2019-10-23 06:06:32.77)
Unable to obtain ROHS sheet for this item
YLohia  (posted 2019-10-23 08:40:55.0)
Thank you for contacting Thorlabs. We will reach out to you directly with this information.
ludoangot  (posted 2019-01-03 19:50:53.187)
Would it be possible you offer your SM1Lxx and SM1Mxx tubes without the retaining ring? The ring is mainly useful when an optical element is to be inserted in the tube, but in several optical assemblies the ring isn't used: after several years of using these tubes for various optical assemblies, we have accumulated more than a dozen of these rings for which we have no use. At USD4.50 the ring, it would be a welcome cost reduction to be able to order the tubes without the ring.
YLohia  (posted 2019-01-09 09:26:42.0)
Hello, thank you for your feedback. We do have the ability to sell these lens tube separately, however, these will be offered as "special" items through Tech Support (and have to go through a special quoting process that can incur a 1-2 day lead time). Due to the additional processing involved, the price of the tube without the retaining ring is nearly the same as that of the standard bundle with the retaining ring included. Given that you're not using retaining rings with your lens tubes, it's possible that one of our Ø1" Lens Tube Spacers Without Internal Threads may be suitable (they come without retaining rings). I will reach out to you directly with more information.
user  (posted 2017-02-09 12:22:23.463)
I would like to suggest creation of a new product for 0.5" thick optics without so much excess as using the 1 inch long tube: SM1L075 for a tube with thread depths of either 0.75". Thanks!
tfrisch  (posted 2017-02-16 11:56:59.0)
Hello, thank you for contacting Thorlabs. We can likely offer this as a custom if you reach out to us at TechSupport@Thorlabs.com. I will also post it in our internal engineering forum.
lukasz.dziechciarczyk  (posted 2016-07-25 06:50:31.153)
Dear Sir or Madame, Is there a lens tube like SM1L05 but with a locking screw going through it that could hold a custom piece inside (unthreaded) ? Lukasz
aklossek  (posted 2015-10-29 09:30:05.75)
Dear ladies and gentlemen, I'm interested in using the SM1S10 lens tube. Do I understand auto CAD pdf correctly by seeing that the thread is not complete along to the thread range? This may cause that components with thin thread (e.g. CM1-DCH) rotate freely. Best regards André Klossek
besembeson  (posted 2015-10-29 02:55:33.0)
Response from Bweh at Thorlabs USA: Yes the thread is not complete but it will not cause free rotation. The un-threaded space on the SM1S10 is 0.38mm while the threaded region of the CM1-DCH is about 2.03mm so you should still have at least 2 threads that will lock the two together.
ludoangot  (posted 2015-08-03 14:01:00.307)
Hello, 1.5" long tubes would be much welcomed, I have a 1" thick lens element which doesn't fit in your 1" tubes but 2" is too long for my setup! Could you offer these in both SM1Lxx and SM1Mxx line?
besembeson  (posted 2015-08-19 11:54:55.0)
Response from Bweh at Thorlabs USA: Thanks for your feedback. We can offer this to you as a special item for now. I will follow up by email. We will review this as a possible expansion to the lens tube stock product line.
cbrideau  (posted 2015-07-29 11:45:51.027)
I'd like to see an extension tube like this made available for the SM30 line, and I'd also like to see a 12" length of this in the SM1 and SM30 for really long builds.
besembeson  (posted 2015-09-23 07:32:18.0)
Response from Bweh at Thorlabs USA: We can provide this to you as a special item if needed. For now, you could use various combinations of the SM30 lens tubes to achieve your desired length or two SM1E60 of the SM1 extension.
u.eisenbarth  (posted 2014-02-17 14:55:25.57)
Dear Madam / Sir, We are regularly using the SM tube system and are quite happy with it. However since we also use many custom parts which we want to connect to the SM standard it would be desireable if you would offer a corresponding thread cutter (for both internal and external threads). While our workshop can produce this type of (non-standard) thread on their turning machines it would make life much easier. Regards, Udo Eisenbarth
cdaly  (posted 2014-02-25 05:52:19.0)
Response from Chris at Thorlabs: Thank you for your inquiry. We do have SM05 and SM1 taps to produce internal threads available at the linke below. At the moment, we do not offer these dies as standard items, but we can offer them as customs for the time being. Inquiries for these should be directed to techsupport@thorlabs.com We will contact you directly with this information. http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1189
sharrell  (posted 2012-03-30 14:26:00.0)
A response from Sean at Thorlabs: Thank you again for your feedback on our lens tube covers. Several of our engineers have had sucess cutting the SC1L24 covers with a band saw or a coping saw. We have added this information to the website as a suggestion to future customers. In addition, one of our engineers tried using a pipe cutter and unfortunately, the tube was crushed.
tcohen  (posted 2012-03-29 14:14:00.0)
Response from Tim at Thorlabs: One of our target specifications for this product was for it to be easy to cut. We are grateful to hear your feedback on this so we can improve the design. I am talking to our engineers to see if we can offer this with reduced thickness or if we can provide a tool for clean cutting. Thank you for your feedback!
user  (posted 2012-03-29 10:58:43.0)
The SC1L24 lens tube cover requires a power tool to cut, can you please consider adding a thin tube that could be cut more easily. Alternatively, provide some sort of jig that would allow the tube to be cut, i'm thinking a pipe cutter like gizmo. Thanks for listening, you guys are great!
bdada  (posted 2011-06-24 11:41:00.0)
Response from Buki at Thorlabs: Thank you for your feedback. We have listed more details about our SMx series threads on our website. Please use the link below and click on the "Threading Specs" tab. http://www.thorlabs.com/NewGroupPage9.cfmObjectGroup_ID=3307&pn=SM1L03#3388 If you have any questions, please contact TechSupport@thorlabs.com
jon.hackett  (posted 2011-06-24 10:23:11.0)
I see below that you have emailed the details of the SM1 thread form to others, can you please send me the details of this and the SM05, as I am designing parts to mate with them? Thanks. Customer Email: jon.hackett@ametek.co.uk This customer would like to be contacted.
jjurado  (posted 2011-06-23 18:10:00.0)
Response from Javier at Thorlabs to nkad: Thank you very much for contacting us. We offer a few SM1 couplers which consist of external SM1 threads throughout the entire length of the tube. However, keep in mind that the internal diameter of these couplers is 24.0 mm, as it is not possible to have a tube with both internal and external SM1 threads along the section of the tube. Please take a look at the following link for our SM1 couplers with external threads and our adjustable lens tubes: SM1 lens tube couplers with external threads: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=2704 Adjustable SM1 lens tubes: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=4109 I will contact you directly to get a better understanding of your application.
nkad  (posted 2011-06-22 21:56:14.0)
Do you have an SM1 tube with external threads along the whole length of the tube? This would permit infinite length adjustment for optics fixed at one end, especially when coupled with Lens Tubes Without External Threads. Customer Email: nkad@essex.ac.uk This customer would like to be contacted.
Greg  (posted 2011-01-13 08:31:48.0)
A response from Greg at Thorlabs to mr.keith: Thank you for contacting us! I have e-mailed you the specifications of our SM1 threading.
Thorlabs  (posted 2010-09-02 13:52:28.0)
Response from Javier at Thorlabs to driall: I will send you an e-mail with the complete specifications for the SM1 thread shortly.
driall  (posted 2010-09-02 11:34:31.0)
i have a question on the SM1 threads: 1.035" - 40 does not define thread class, tooth profile. What is the full thread callout? im designing a part to mate with one of these tubes, and id like more info. Thanks, Dan
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Ø1" Stackable Lens Tubes

  • Stackable Design Enables Multi-Element Optical Systems
  • SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Compatible with Our 30 mm Cage Systems
  • 0.30", 0.50", 1.00", and 2.00" Lengths Available in Packs of 5

These stackable Ø1" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM1-threaded (1.035"-40) components provide flexibility for complex optomechanical assemblies. One SM1RR Retaining Ring is included with each lens tube.

For convenience, four of our most popular SM1 lens tube sizes are also available in packs of 5. Each pack of 5 includes one retaining ring per lens tube for a total of five rings.

SM1Lxx Lens Tube Diagram
Item # L Internal Thread Depth
SM1L03 0.33" (8.4 mm) 0.30" (7.6 mm)
SM1L05 0.53" (13.5 mm) 0.50" (12.7 mm)
SM1L10 1.03" (26.2 mm) 1.00" (25.4 mm)
SM1L15 1.53" (38.9 mm) 1.50" (38.1 mm)
SM1L20 2.03" (51.6 mm) 2.00" (50.8 mm)
SM1L25 2.53" (64.3 mm) 2.50" (63.5 mm)
SM1L30 3.03" (77.0 mm) 3.00" (76.2 mm)
SM1L35 3.53" (89.7 mm) 3.50" (88.9 mm)
SM1L40 4.03" (102.4 mm) 4.00" (101.6 mm)

Alternatives Ø1/2", Ø30 mm, Ø1.5"Ø2", and Ø3" Stackable Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1L03 Support Documentation
SM1L03SM1 Lens Tube, 0.30" Thread Depth, One Retaining Ring Included
$13.15
Today
SM1L03-P5 Support Documentation
SM1L03-P5SM1 Lens Tube, 0.30" Thread Depth, SM1RR Retaining Ring, 5 Pack
$62.45
Today
SM1L05 Support Documentation
SM1L05SM1 Lens Tube, 0.50" Thread Depth, One Retaining Ring Included
$13.62
Today
SM1L05-P5 Support Documentation
SM1L05-P5SM1 Lens Tube, 0.50" Thread Depth, SM1RR Retaining Ring, 5 Pack
$64.67
Today
SM1L10 Support Documentation
SM1L10SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
$15.41
Today
SM1L10-P5 Support Documentation
SM1L10-P5SM1 Lens Tube, 1.00" Thread Depth, SM1RR Retaining Ring, 5 Pack
$73.22
Today
SM1L15 Support Documentation
SM1L15SM1 Lens Tube, 1.50" Thread Depth, One Retaining Ring Included
$16.98
Today
SM1L20 Support Documentation
SM1L20SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
$17.85
Today
SM1L20-P5 Support Documentation
SM1L20-P5SM1 Lens Tube, 2.00" Thread Depth, SM1RR Retaining Ring, 5 Pack
$84.79
Today
SM1L25 Support Documentation
SM1L25SM1 Lens Tube, 2.50" Thread Depth, One Retaining Ring Included
$22.83
Today
SM1L30 Support Documentation
SM1L30SM1 Lens Tube, 3.00" Thread Depth, One Retaining Ring Included
$29.23
Today
SM1L35 Support Documentation
SM1L35SM1 Lens Tube, 3.50" Thread Depth, One Retaining Ring Included
$40.54
Today
SM1L40 Support Documentation
SM1L40SM1 Lens Tube, 4.00" Thread Depth, One Retaining Ring Included
$49.64
Today
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Vacuum-Compatible Ø1" Stackable Lens Tubes

Vacuum Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 6061-T6 Aluminum
Preparation and
Packaging
Chemically Cleaned and
Double Vacuum-Bagged
Aluminum Outgassing
Rate at 20 °C
7.6 x 10-9 Torr-Liters/s/cm2
  • This is the pressure at which these components can be used with no additional processing. They can be used at even lower pressures with additional cleaning and processing.
  • Stackable Design Enables Multi-Element Optical Systems
  • SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Compatible with SM1-Threaded Vacuum Components
  • 0.30", 0.50", and 1.00" Lengths Available

These stackable Ø1" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM1-threaded (1.035"-40) components provide flexibility for complex optomechanical assemblies. Made from 6061-T6 aluminum, these lens tubes are vacuum compatible down to 10-6 Torr. One SM1RRV Vacuum-Compatible Retaining Ring is included with each lens tube.

These vacuum-compatible lens tubes feature venting channels along the internal threading and at the ends of each tube. These channels allow air trapped between mounted optics an easy means of escape during pumpdown.

Vent in Vacuum Lens Tubes
Click to Enlarge

Vents along the threading and at the ends of these tubes provide a free path for air to escape when under vacuum.
SM1Lxx Lens Tube Diagram
Item # L Internal Thread Depth
SM1L03V 0.33" (8.4 mm) 0.30" (7.6 mm)
SM1L05V 0.53" (13.5 mm) 0.50" (12.7 mm)
SM1L10V 1.03" (26.2 mm) 1.00" (25.4 mm)
Alternatives Ø1/2" Vacuum-Compatible Stackable Lens Tube
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SM1L03V Support Documentation
SM1L03VVacuum-Compatible SM1 Lens Tube, 0.30" Thread Depth, One Retaining Ring Included
$42.97
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SM1L05V Support Documentation
SM1L05VVacuum-Compatible SM1 Lens Tube, 0.50" Thread Depth, One Retaining Ring Included
$43.54
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SM1L10V Support Documentation
SM1L10VVacuum-Compatible SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
$48.89
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Ø1" Lens Tubes Without External Threads

SM1Mxx Lens Tube Diagram
  • Unlike Stackable Lens Tubes, Optics can be Accessed from Both Ends
  • SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Use Lens Tube Couplers to Stack Multiple Lens Tubes
  • Allows Coupling of Two Externally SM1-Threaded Components

Unlike our Ø1" stackable lens tubes featured above, these internally threaded lens tubes do not feature a lip at one end nor do they have external SM1 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use a Lens Tube Coupler. Two SM1RR Retaining Rings are included with each lens tube.

Alternatives Ø1/2" and Ø2" Lens Tubes Without External Threads
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SM1M05 Support Documentation
SM1M05Customer Inspired! SM1 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
$15.36
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SM1M10 Support Documentation
SM1M10Customer Inspired! SM1 Lens Tube Without External Threads, 1" Long, Two Retaining Rings Included
$16.96
3 weeks
SM1M15 Support Documentation
SM1M15SM1 Lens Tube Without External Threads, 1.5" Long, Two Retaining Rings Included
$19.84
Today
SM1M20 Support Documentation
SM1M20Customer Inspired! SM1 Lens Tube Without External Threads, 2" Long, Two Retaining Rings Included
$19.84
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SM1M25 Support Documentation
SM1M25SM1 Lens Tube Without External Threads, 2.5" Long, Two Retaining Rings Included
$21.33
Today
SM1M30 Support Documentation
SM1M30Customer Inspired! SM1 Lens Tube Without External Threads, 3" Long, Two Retaining Rings Included
$21.33
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SM1M35 Support Documentation
SM1M35SM1 Lens Tube Without External Threads, 3.5" Long, Two Retaining Rings Included
$34.30
Today
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Ø1" Lens Tubes Without External Threads, Optic Retention Lip

SM1LxxE Lens Tube Diagram
Item # L Thread Depth
SM1L05E 0.54"
(13.7 mm)
0.50"
(12.7 mm)
SM1L10E 1.04"
(26.4 mm)
1.00"
(25.4 mm)
  • Internal SM1 Threading (1.035"-40) with Optic Retention Lip at One End
  • Quickly Add and Remove Optics from Ø1" Lens Tube Assemblies
  • 1/2" (12.7 mm) and 1" (25.4 mm) Thread Depths Available
  • Ø0.90" (Ø22.9 mm) Clear Aperture

These lens tubes feature internal SM1 threading on one end and a retaining lip for holding optics on the other. They allow optics to be quickly added to any externally SM1-threaded components. The SM1L05E is 1/2" (12.7 mm) long and can hold optics up to 0.3" (8 mm) thick, while the SM1L10E is 1" (25.4 mm) long and can hold optics up to 0.8" (20 mm) thick. Each segment includes an SM1RR retaining ring for securing the optic into place. The retaining ring provides a clear aperture of Ø0.90" (Ø22.9 mm) through the lens tube.

These lens tubes are engraved with their respective part number at the end, as shown in the image to the left. This engraving is hidden when the lens tubes are combined with other SM1-threaded components. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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SM1L05E Support Documentation
SM1L05ECustomer Inspired! SM1 Lens Tube Without External Threads, Optic Retention Lip, 1/2" Thread Depth, One Retaining Ring Included
$14.62
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SM1L10E Support Documentation
SM1L10ECustomer Inspired! SM1 Lens Tube Without External Threads, Optic Retention Lip, 1" Thread Depth, One Retaining Ring Included
$16.74
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Ø1" Lens Tube Spacers Without Internal Threads

SM1Sxx Lens Tube Diagram
  • Use as Spacers Between Lens Tubes
  • External SM1 Threading (1.035"-40) on Each End
  • Ø0.95" (Ø24.0 mm) Clear Aperture
  • Lengths Ranging from 1.0" (25.4 mm) to 3.5" (88.9 mm)

These Lens Tube Spacers are designed to connect two components with internal SM1 threads at a fixed distance. They are internally unthreaded and have a clear aperture of Ø0.95" (Ø24.0 mm).

Please note that due to the fixed thread depth of 0.12" (3.0 mm), the orientation of the attached components will be arbitrary. For full control over the component orientation, Thorlabs offers Lens Tube Couplers with adjustable locking rings.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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SM1S10 Support Documentation
SM1S10Customer Inspired! SM1 Lens Tube Spacer, 1" Long
$14.62
Today
SM1S15 Support Documentation
SM1S15SM1 Lens Tube Spacer, 1.5" Long
$16.99
Today
SM1S20 Support Documentation
SM1S20Customer Inspired! SM1 Lens Tube Spacer, 2" Long
$16.99
Today
SM1S25 Support Documentation
SM1S25SM1 Lens Tube Spacer, 2.5" Long
$24.23
Today
SM1S30 Support Documentation
SM1S30Customer Inspired! SM1 Lens Tube Spacer, 3" Long
$24.23
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SM1S35 Support Documentation
SM1S35SM1 Lens Tube Spacer, 3.5" Long
$28.03
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Ø1" Slotted Lens Tubes

Slotted Lens Tube
Click to Enlarge

The dust cover can be opened or closed by rotating it in either direction.
  • Easy Access to Optics
  • Rotatable Slip Shield Protects Optics
  • Compatible with SM1-Threaded (1.035"-40) Components
  • Available in 1", 2", and 3" Thread Depths

These stackable Ø1" lens tubes with side slots provide a fast and easy means for building complex optical assemblies and adjusting the optics without disassembling the setup. Optics can be inserted into the tube and locked into position using the included SM1RR retaining rings. Simply thread the first retaining ring to the desired depth, add the optic, and then use a second retaining ring to secure the optic. Optics can be manually adjusted via the side slots without the use of a spanner wrench. The included rotatable slip shield, with an inner diameter of 1.21" (31.0 mm), fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris.

SM1LxxC Lens Tube Diagram
Item # L1 L2 Internal Thread Depth
SM1L10C 1.03" (26.2 mm) 0.80" (20.3 mm) 1.00" (25.4 mm)
SM1L20C 2.03" (51.6 mm) 1.30" (33.0 mm) 2.00" (50.8 mm)
SM1L30C 3.03" (77.0 mm) 2.30" (58.4 mm) 3.00" (76.2 mm)

Alternatives Ø1/2" and Ø2" Slotted Lens Tubes
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SM1L10C Support Documentation
SM1L10CCustomer Inspired! SM1 Slotted Lens Tube, 1" Thread Depth, 2 Retaining Rings Included
$65.87
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SM1L20C Support Documentation
SM1L20CSM1 Slotted Lens Tube, 2" Thread Depth, 2 Retaining Rings Included
$72.77
3 weeks
SM1L30C Support Documentation
SM1L30CSM1 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
$79.00
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Ø1" Extension Tubes

SM1E60 Diagram
  • Extra-Long 6" (152.4 mm) Tube for Optics with Large Focal Lengths
  • 1.00" (25.4 mm) Long, SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Compatible with 30 mm Cage Systems

The SM1E60 6" Long Extension Tube is designed to enable longer distances between optical components in lens tube systems that utilize lenses with large focal lengths. This tube features thicker walls than our standard lens tubes while maintaining the same outer diameter, which leads to greater rigidity. 

Alternatives Ø2" Extension Tubes
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SM1E60 Support Documentation
SM1E60SM1 Extension Tube, 6" Long, 1" Thread Depth, One Retaining Ring Included
$53.47
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Ø1" Retaining Rings and Spanner Wrenches

Retaining Ring Specs
Item # Material Feature Thickness Inner
Diameter
SM1RR Black Anodized Aluminum Standard 0.08"
(2.0 mm)
0.90"
(22.9 mm)
SM1RRV Unanodized Aluminum Vacuum Compatiblea 0.08"
(2.0 mm)
0.90"
(22.9 mm)
SM1LTRR Black Anodized Aluminum Rubber O-Ring
for Stress-Free Mounting
0.16"
(3.9 mm)
0.82"
(20.7 mm)
SM1RRC Black Anodized Aluminum 5 mm Thick for
High-Curvature Lenses
0.20"
(5.0 mm)
0.90"
(22.9 mm)
SM1PRR Plastic Non-Marring 0.11"
(2.8 mm)
0.80"
(20.3 mm)
POLARIS-SM1RR Stainless Steel Vacuum Compatibleb 0.08"
(2.0 mm)
0.90"
(22.9 mm)
  • >10-6 Torr Vacuum Compatibility as Packaged; Lower Pressures with Additional Cleaning and Processing
  • >10-5 Torr at 25 °C Vacuum Compatibility as Packaged without Bake Out; >10-9 Torr at 25 °C with Proper Bake Out
  • Six Types of Retaining Rings for Securing Ø1" Optics
  • Multiple Hollow Spanner Wrenches Providing Unobstructed Beam Path During Adjustment
  • SPW801 Adjustable Spanner Wrench Accommodates Diameters from 0.12" (3.0 mm) to 2.89" (73.4 mm)

The SM1RR is our standard anodized aluminum retaining ring that ships with our Ø1" lens tubes as well as many other Thorlabs components and is available individually and in packs of 10. We offer six different SM1-threaded (1.035"-40) retaining rings, shown in the table to the right, which have unique features and can replace an SM1RR retaining ring. Please keep in mind that due to the increased thickness of some retaining rings, the maximum optic thickness that can be housed inside our standard SM1-compatible mounts will be diminished in some cases.

Spanner Wrench Application
Click to Assemble

Spanner Wrench Usage

Spanner Wrenches
The 1" long SPW606 and the 3.87" long SPW602 have a hollow design that enables retaining rings with inner diameters of 0.90" to be adjusted and installed in our SM01 series of lens tubes without obscuring the beam path, as shown to the right. Their handles are knurled for improved grip. In addition, the SPW602 wrench has graduations along its side to judge lens depth within a lens tube.

Alternatively, the SPW801 Adjustable Spanner Wrench can be used to position any SM1-threaded retaining ring. Please note that the SPW801 wrench can withstand a maximum torque of 80 inch-pounds. We also offer the SPB1 Spanner Bit, which can be used with a standard 1/4" hex driver (sold separately). The SPB1 is included as part of the SPB600 Spanner Wrench Bit Kit.

Alternatives Ø1/2", Ø2", and Ø3" Fixed Diameter Spanner Wrenches Ø1/2", Ø1.5", Ø2", and Ø3" Retaining Rings
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SM1RR Support Documentation
SM1RRSM1 Retaining Ring for Ø1" Lens Tubes and Mounts
$4.87
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SM1RR-P10 Support Documentation
SM1RR-P10SM1 Retaining Ring for Ø1" Lens Tubes and Mounts, 10 Pack
$43.81
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SM1RRV Support Documentation
SM1RRVCustomer Inspired! Unanodized Aluminum SM1 Retaining Ring for Ø1" Lens Tubes and Mounts
$12.01
Today
SM1LTRR Support Documentation
SM1LTRRSM1 (1.035"-40) Stress-Free Retaining Ring
$26.01
Today
SM1RRC Support Documentation
SM1RRCExtra-Thick SM1 (1.035"-40) Threaded Retaining Ring
$12.24
Today
SM1PRR Support Documentation
SM1PRRCustomer Inspired! SM1 (1.035"-40) Plastic Retaining Ring for Ø1" Lens Tubes and Mounts
$6.48
Today
POLARIS-SM1RR Support Documentation
POLARIS-SM1RRCustomer Inspired! Stainless Steel SM1 (1.035"-40) Threaded Retaining Ring
$13.16
Today
SPW606 Support Documentation
SPW606Customer Inspired! Spanner Wrench for SM1-Threaded Retaining Rings, Length = 1.00"
$31.15
Today
SPW602 Support Documentation
SPW602Spanner Wrench for SM1-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"
$31.15
Today
SPW801 Support Documentation
SPW801Adjustable Spanner Wrench
$114.14
Today
SPW102 Support Documentation
SPW102Adjustable Spanner Wrench, Replacement Blade Set
$33.20
Today