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Ø1/2" Lens Tubes


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Ø1/2 Lens Tubes

Additional Lens Tube Sizes
Ø1"
Ø30 mm
Ø2"
Ø3"
Cross Section of SM-Series Lens Tube

Features

  • Easily Construct Multi-Element Optical Systems
  • Wide Range of SM05-Compatible Optomechanical Components Available
  • Directly Accepts Ø1/2" (12.7 mm) Optics
  • Compatible with Our 16 mm Cage Systems
  • Available With or Without External SM05 Threads
  • Can be Used with Ø5 - Ø9 mm Optics by Purchasing a Small Optic Adapter

Lens tubes are ideal for creating compact optical subassemblies. The Ø1/2" lens tubes sold here can be used to house one or several optical elements. Optics are separated and secured by retaining rings that are positioned at the desired depth within the lens tube using our SPW603 spanner wrench. Depending on the item purchased, one or two retaining rings will be included (see below for details). Additional retaining rings can be purchased separately. In addition to the Ø1/2" lens tubes featured on this page, Thorlabs also offers Ø1", Ø30 mm, Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter.

Lens Tube Application Example
Lens Tube Compatible Products
Thread AdaptersTerminated Fiber AdaptersCollimation Package AdaptersLED and LD MountsAspheric Lens MountsIrises, Apertures, and ShuttersAlignment Tools

SM Series Threading Specifications

Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. For threading specifications other than what is listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0, UNS-2AInternal Thread, 0.535"-40.0, UNS-2B
Max Major Diameter0.5340"Min Major Diameter0.5350"
Min Major Diameter0.5289"Min Pitch Diameter0.5188"
Max Pitch Diameter0.5178"Max Pitch Diameter0.5230"
Min Pitch Diameter0.5146"Min Minor Diameter (and 83.3% of thread)0.508"
Max Minor Diameter0.5069"Max Minor Diameter (and 64.9% of thread)0.514"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0, UNS-2AInternal Thread, 1.035"-40.0, UNS-2B
Max Major Diameter1.0339"Min Major Diameter1.0350"
Min Major Diameter1.0288"Min Pitch Diameter1.0188"
Max Pitch Diameter1.0177"Max Pitch Diameter1.0234"
Min Pitch Diameter1.0142"Min Minor Diameter (and 83.3% of thread)1.008"
Max Minor Diameter1.0068"Max Minor Diameter (and 64.9% of thread)1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5x0.5Internal Thread, M30.5x0.5
Max Major Diameter30.480 mmMin Major Diameter30.500 mm
Min Major Diameter30.371 mmMin Pitch Diameter30.175 mm
Max Pitch Diameter30.155 mmMax Pitch Diameter30.302 mm
Min Pitch Diameter30.059 mmMin Minor Diameter (and 83.3% of thread)29.959 mm
Max Minor Diameter29.938 mmMax Minor Diameter (and 64.9% of thread)30.094 mm
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0, UNS-2AInternal Thread, 2.035"-40.0, UNS-2B
Max Major Diameter2.0338"Min Major Diameter2.0350"
Min Major Diameter2.0287"Min Pitch Diameter2.0188"
Max Pitch Diameter2.0176"Max Pitch Diameter2.0239"
Min Pitch Diameter2.0137"Min Minor Diameter (and 83.3% of thread)2.008"
Max Minor Diameter2.0067"Max Minor Diameter (and 64.9% of thread)2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0, UNS-2AInternal Thread, 3.035"-40.0, UNS-2B
Max Major Diameter3.0337"Min Major Diameter3.0350"
Min Major Diameter3.0286"Min Pitch Diameter3.0188"
Max Pitch Diameter3.0175"Max Pitch Diameter3.0242"
Min Pitch Diameter3.0133"Min Minor Diameter (and 83.3% of thread)3.008"
Max Minor Diameter3.0066"Max Minor Diameter (and 64.9% of thread)3.014"
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Posted Comments:
Poster: s13d504
Posted Date: 2013-05-30 22:34:59.403
Hello,this is Wei Qi,from Kagawa Unv. Japan. We want to buy SM05L05,but we don't know that the lens(Diameter:12.7mm or smaller)can be used in the lens tubes? If the lens(Diameter:12.7mm or smaller)can be used in this lens tubes, the other parts is necessary? You can contact me by e-mail s13d504@stmail.eng.kagawa-u.ac.jp Thank you very much. Regards,
Poster: tcohen
Posted Date: 2013-05-30 12:39:00.0
Response from Tim at Thorlabs to Wei: The retention lip is .450” and lenses with a diameter larger than that will be restricted. A 12.7mm lens will pass through the SM05 threads to the retention lip and be held in with a retaining ring (included). Smaller optics can be adapted to the SM05 standard with adapters such as our LMRA series: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=59.
Poster: jlow
Posted Date: 2012-07-31 12:19:00.0
A response from Jeremy at Thorlabs. Thank you for your feedback. I have forwarded your feedback to our engineering group to be added. The inner diameter for the part you referenced is Ø0.450".
Poster:
Posted Date: 2012-07-31 09:36:49.0
The dimension of the ID of the externally threaded end is missing from the SM05L05 lens tube drawing. As this diameter defines the maximum aperture of the back end of the lens tube i would consdier it an important number to provide. Please be kind enough to add this dimension.
Poster: jjurado
Posted Date: 2011-02-15 08:39:00.0
Response from Javier at Thorlabs to sivan.jonathan: Thank you very much for submitting your request. I will send you the specs for our SM05 threads to your e-mail. We will also post this information on the web shortly.
Poster: sivan.jonathan
Posted Date: 2011-02-14 13:36:51.0
Hello, I need to interface with this product, both to external and internal threading. Can I recieve the engineering specs for these threads (they are not standard). Specifically tap, diameters etc...
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amy   Beam expander   Collimator Adapters for Lens Tubes   Dust Cover   Filter mount   lens holder   lens mount   lens tube   lens tube slots   optical construction   Shortpass filters   slip shield   SM05 Slotted Lens Tube   SM05RR   SM1A1   SM1A6   stackable lens tube  
Ø1/2" Stackable Lens Tubes
  • Stackable Design Enables Multi-Element Optical Systems
  • SM05-Threaded (0.535"-40) Bore Directly Accepts Ø1/2" (12.7 mm) Optics
  • Accommodates Ø5 - Ø9 mm Optics by Purchasing a Small Optic Adapter
  • Directly Compatible with Our 16 mm Cage Assembly Systems

These stackable Ø1/2" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM05-threaded (0.535"-40) components provide flexibility for complex optomechanical assemblies. One SM05RR retaining ring is included with each lens tube.

SM05Lxx Lens Tube Diagram
Item #L1L2Thread Depth
SM05L03 0.41" 0.08" 0.3"
SM05L05 0.61" 0.08" 0.5"
SM05L10 1.11" 0.08" 1.0"
SM05L20 2.11" 0.08" 2.0"
SM05L30 3.11" 0.08" 3.0"
Alternatives Ø1", Ø2", and Ø3" Stackable Lens Tubes Ø1" and Ø2" Lens Tube Extensions Ø1" and Ø2" Lens Tubes with Side Access Ports
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
SM05L03 Support Documentation
SM05L03 SM05 Lens Tube, 0.3" Thread Depth, One Retaining Ring Included
$13.50
Today
SM05L05 Support Documentation
SM05L05 SM05 Lens Tube, 0.5" Thread Depth, One Retaining Ring Included
$13.75
Today
SM05L10 Support Documentation
SM05L10 SM05 Lens Tube, 1" Thread Depth, One Retaining Ring Included
$14.75
Today
SM05L20 Support Documentation
SM05L20 SM05 Lens Tube, 2" Thread Depth, One Retaining Ring Included
$19.75
Today
SM05L30 Support Documentation
SM05L30 SM05 Lens Tube, 3" Thread Depth, One Retaining Ring Included
$23.75
Today
Ø1/2" Lens Tubes Without External Threads
  • SM05-Threaded (0.535"-40) Bore Directly Accepts Ø1/2" (12.7 mm) Optics
  • Accommodates Ø5 - Ø9 mm Optics by Purchasing a Small Optic Adapter
  • Unlike Stackable Lens Tubes, Optics can be Accessed from Both Ends
  • Use Lens Tube Couplers to Stack Multiple Lens Tubes
  • Allows Coupling of Two Externally SM05-Threaded Components

Unlike our Ø1/2" stackable lens tubes featured above, these internally threaded lens tubes do not feature a lip at one end nor do they have external SM05 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use an SM05T2 Lens Tube Coupler. Two SM05RR retaining rings are included with each lens tube.

Alternatives Ø1" and Ø2" Lens Tubes Without External Threads
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available / Ships
SM05M05 Support Documentation
SM05M05 Customer Inspired! SM05 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
$13.50
Today
SM05M10 Support Documentation
SM05M10 Customer Inspired! SM05 Lens Tube Without External Threads, 1" Long, Two Retaining Rings Included
$14.75
Today
SM05M20 Support Documentation
SM05M20 Customer Inspired! SM05 Lens Tube Without External Threads, 2" Long, Two Retaining Rings Included
$16.50
Today
SM05M30 Support Documentation
SM05M30 Customer Inspired! SM05 Lens Tube Without External Threads, 3" Long, Two Retaining Rings Included
$18.00
Today
Ø1/2" Slotted Lens Tube
  Easy Access to Optics
  Rotatable Slip Shield Protects Optics
  Compatible with SM05-Threaded Components

This stackable Ø1/2" lens tube with side slots provides a fast and easy means for building complex optical assemblies and adjusting the optics without disassembling the setup. Several optics can be inserted into a single tube using multiple SM05RR 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 rotatable slip shield included with the lens tube fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris. Two retaining rings and one black plastic dust cover are included with each lens tube.

Alternatives Ø1" and Ø2" Slotted Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
SM05L30C Support Documentation
SM05L30C SM05 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
$50.00
Today
Ø1/2" Retaining Rings and Spanner Wrenches
  • SM05RR Retaining Rings Secure Ø1/2" Optics
  • SM05LTRR Retaining Rings Provide Stress-Free, Light-Tight Mounting of Ø1/2" Components
  • Spanner Wrenches Provide One-Handed Adjustment of SM05RR Retaining Rings
  • SPW801 Adjustable Spanner Wrench can Accommodate Diameters from 0.15" (3.8 mm) to 3.0" (75 mm)

Thorlabs offers two different kinds of SM05 retaining rings. The SM05RR is our standard retaining ring that ships with our Ø1/2" lens tubes as well as many other Thorlabs components. If desirable, the SM05RR can be swapped out for a SM05LTRR, which is a retaining ring equipped with a Buna-N O-ring designed to reduce stress on the optical component and to produce a light-tight seal.

To position and adjust these retaining rings, choose one of our two spanner wrench options. The SPW603 Spanner Wrench has a hollow design that enables retaining rings for our SM05 series of lens tubes to be adjusted and installed without obscuring the beam path. The handle is knurled for improved grip. For use with longer lens tubes, multiple SPW603 spanning wrenches can be stacked to extend the wrench's maximum reach. Alternatively, the SPW801 Adjustable Spanner Wrench can also be used to position SM05RR or SM05LTRR retaining rings. Please note that the SPW801 wrench can withstand a maximum torque of 80 inch pounds. As an additional option, we also offer the SPB600 Spanner Wrench Bit Kit.

Alternatives Ø1", Ø2", and Ø3" Fixed Diameter Spanner Wrenches Ø1", Ø2", and Ø3" Retaining Rings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
SM05RR Support Documentation
SM05RR SM05 Retaining Ring for Ø1/2" Lens Tubes and Mounts
$4.00
Today
SM05LTRR Support Documentation
SM05LTRR SM05 Series Stress-Free Retaining Ring
$18.40
Today
SPW603 Support Documentation
SPW603 SM05 Spanner Wrench, Length = 1"
$24.00
Today
SPW801 Support Documentation
SPW801 Adjustable Spanner Wrench
$95.90
Today
SPW102 Support Documentation
SPW102 Replacement Blade Set
$27.90
Today
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