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Ø2" Lens Tubes


  • Directly Accepts Ø2" (50.8 mm) Optics
  • Compatible with SM2-Threaded Components
  • Designed for use with Our 60 mm Cage Systems

SM2L30C

SM2L30

SM2M10

SPW604

Spanner Wrench

SM05L10

SM1L10

SM2L10

SM3L10

SM1A1

SM1A2

SM3A2

Easily Interface with Other Lens Tube Sizes

Related Items


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SM2 Lens Tube Engravings
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When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.
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Features

  • Easily Construct Multi-Element Optical Systems
  • Wide Range of SM2 (2.035"-40) Compatible Optomechanical Components Available
  • Compatible with Our 60 mm Cage Systems
  • Directly Accepts Ø2" (50.8 mm) Optics

Lens tubes are ideal for creating compact optical subassemblies. The Ø2" lens tubes sold here can be used to house one or several optical elements, as shown in the diagram of a beam expander below. Optics are separated and secured by retaining rings that are positioned at the desired depth within the lens tube using our SPW604 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 Ø2" lens tubes featured on this page, Thorlabs also offers Ø1/2", Ø1", Ø30 mm, 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 Adapters Terminated Fiber Adapters Collimation Package Adapters LED and LD Mounts Aspheric Lens Mounts Irises, Apertures, and Shutters Alignment Tools

Thorlabs' 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. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these 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 LensesCCD/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, M30.5x0.5 Internal Thread, M30.5x0.5
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
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"

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Posted Comments:
Poster:ger.folkersma
Posted Date:2016-06-30 04:53:01.43
Hi, the Solidowrks model of the SM2L15 seems to be corrupted. All other tube models work fine.
Poster:s.kovalev
Posted Date:2015-10-13 20:29:52.873
Hello. Do you have 2'' tubes with 6'' length or can you make it for us. Thanks Sergey.
Poster:besembeson
Posted Date:2015-10-13 03:57:52.0
Response from Bweh at Thorlabs USA: Yes we do. It seems the SM2E60 may be suitable for you - http://www.thorlabs.com/thorproduct.cfm?partnumber=SM2E60
Poster:cqtttv
Posted Date:2013-07-22 17:48:37.463
What is the tolerance on the diameter and sphericity?
Poster:jlow
Posted Date:2013-07-22 15:58:00.0
Response from Jeremy at Thorlabs: I will contact you directly to discuss about your application and provide this information.

Ø2" Stackable Lens Tubes

  • SM2-Threaded (2.035"-40) Bore Accepts Ø2" (Ø50.8 mm) Optics
  • Stackable Design Enables Multi-Element Optical Systems
  • Compatible with Our 60 mm Cage Assembly Systems

These stackable Ø2" Lens Tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with all SM2-threaded (2.035"-40) components provide flexibility for complex optomechanical assemblies. One SM2RR Retaining Ring is included with each lens tube.  

Scaled SOLIS Spectra
Click to Enlarge

An SM2L15 lens tube used to mount a SOLIS-1A high-powered LED.
SM2Lxx Lens Tube Diagram
Item # L1 L2 Thread Depth
SM2L03 0.45" (11.4 mm) 0.12"
(3.0 mm)
0.30" (7.6 mm)
SM2L05 0.65" (16.5 mm) 0.50" (12.7 mm)
SM2L10 1.15" (29.2 mm) 1.00" (25.4 mm)
SM2L15 1.65" (41.9 mm) 1.50" (38.1 mm)
SM2L20 2.15" (54.6 mm) 2.00" (50.8 mm)
SM2L30 3.15" (80.0 mm) 3.00" (76.2 mm)
Alternatives Ø1/2" and Ø1" Stackable Lens Tubes Ø1" Lens Tube Extensions Ø1" 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 Price Available / Ships
SM2L03 Support Documentation
SM2L03SM2 Lens Tube, 0.3" Thread Depth, One Retaining Ring Included
$22.90
Today
SM2L05 Support Documentation
SM2L05SM2 Lens Tube, 0.5" Thread Depth, One Retaining Ring Included
$25.25
Today
SM2L10 Support Documentation
SM2L10SM2 Lens Tube, 1" Thread Depth, One Retaining Ring Included
$29.50
Today
SM2L15 Support Documentation
SM2L15SM2 Lens Tube, 1.5" Thread Depth, One Retaining Ring Included
$30.25
Today
SM2L20 Support Documentation
SM2L20SM2 Lens Tube, 2" Thread Depth, One Retaining Ring Included
$30.75
Today
SM2L30 Support Documentation
SM2L30SM2 Lens Tube, 3" Thread Depth, One Retaining Ring Included
$36.25
Today

Ø2" Lens Tubes Without External Threads

  • SM2-Threaded (2.035"-40) Bore Accepts Ø2" (Ø50.8 mm) Optics
  • Unlike Stackable Lens Tubes, Optics can be Accessed from Both Ends
  • Use Lens Tube Couplers to Stack Multiple Lens Tubes
  • Allows Coupling of Two Components with External SM2 Threading
  • Directly Compatible with Our 60 mm Cage Assembly Systems

Unlike our Ø2" stackable lens tubes featured above, these Internally Threaded Lens Tubes do not feature a lip at one end nor do they have external SM2 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use an SM2T2 Lens Tube Coupler. Two SM2RR Retaining Rings are included with each lens tube.

Alternatives Ø1/2" and Ø1" Lens Tubes Without External Threads
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM2M05 Support Documentation
SM2M05Customer Inspired!SM2 Lens Tube Without External Threads, 0.5" Thread Depth, Two Retaining Rings Included
$25.00
Today
SM2M10 Support Documentation
SM2M10Customer Inspired!SM2 Lens Tube Without External Threads, 1" Thread Depth, Two Retaining Rings Included
$27.75
Today
SM2M15 Support Documentation
SM2M15SM2 Lens Tube Without External Threads, 1.5" Thread Depth, Two Retaining Rings Included
$28.50
Today
SM2M20 Support Documentation
SM2M20Customer Inspired!SM2 Lens Tube Without External Threads, 2" Thread Depth, Two Retaining Rings Included
$30.25
Today
SM2M25 Support Documentation
SM2M25SM2 Lens Tube Without External Threads, 2.5" Thread Depth, Two Retaining Rings Included
$31.00
Today
SM2M30 Support Documentation
SM2M30Customer Inspired!SM2 Lens Tube Without External Threads, 3" Thread Depth, Two Retaining Rings Included
$32.75
Today
SM2M35 Support Documentation
SM2M35SM2 Lens Tube Without External Threads, 3.5" Thread Depth, Two Retaining Rings Included
$34.00
Today

Slotted Lens Tubes

  • Easy Access to Optics
  • Rotatable Slip Shield Protects Optics
  • Compatible with SM2-Threaded Components

These stackable Ø2" Lens Tubes with side slots provide 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 SM2RR 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 Ø1/2" and Ø1" Slotted Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM2L20C Support Documentation
SM2L20CSM2 Slotted Lens Tube, 2" Thread Depth, 2 Retaining Rings Included
$78.75
Today
SM2L30C Support Documentation
SM2L30CSM2 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
$90.00
Today

SM2 Extension Tubes

The SM2E60 6" Long Extension Tube is designed to enable longer distances between optical components in lens tube systems that utilize lenses with large focal lengths. Although the ends of these extension tubes are threaded to accept our SM2 series stackable lens tubes, they feature thicker walls than our standard lens tubes, which leads to greater rigidity.

Alternatives Ø1" Lens Tube Extensions
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM2E60 Support Documentation
SM2E60SM2 Series Extension Tube, 6"
$61.25
Today

Ø2" Retaining Rings and Spanner Wrenches

  • SM2RR Retaining Rings Secure Ø2" Optics
  • SM2LTRR Retaining Rings Provide Stress-Free, Light-Tight Mounting of Ø2" Components
  • Spanner Wrenches Provide One-Handed Adjustment of SM2RR Retaining Rings
  • SPW801 Adjustable Spanner Wrench can Accommodate Diameters from 0.12" (3.0 mm) to 2.89" (73.4 mm)

Thorlabs offers two different kinds of SM2 (2.035"-40) Retaining Rings. The SM2RR is our Standard Retaining Ring that ships with our Ø2" lens tubes as well as many other Thorlabs components, and is available individually and in packs of 5. If desirable, the SM2RR can be swapped out for a SM2LTRR, 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.

There are also two spanner wrench choices that can be used with these retaining rings. The SPW604 Spanner Wrench has a hollow design that enables retaining rings for our SM2 series of lens tubes to be adjusted and installed without obscuring the beam path. The handle is knurled for improved grip. Alternatively, the SPW801 Adjustable Spanner Wrench can also be used to position SM2RR or SM2LTRR retaining rings. Please note that the SPW801 wrench can withstand a maximum torque of 80 inch pounds.

Alternatives Ø1/2"Ø1", and Ø3" Fixed Spanner Wrenches Ø1/2", Ø1", and Ø3" Retaining Rings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM2RR Support Documentation
SM2RRSM2 Retaining Ring for Ø2" Lens Tubes and Mounts
$6.90
Today
SM2RR-P5 Support Documentation
SM2RR-P5SM2 Retaining Ring for Ø2" Lens Tubes and Mounts, 5 Pack
$31.06
Today
SM2LTRR Support Documentation
SM2LTRRSM2 Series Stress-Free Retaining Ring
$23.50
Today
SPW604 Support Documentation
SPW604Customer Inspired!SM2 Spanner Wrench, Length = 4.35"
$44.50
Today
SPW801 Support Documentation
SPW801Adjustable Spanner Wrench
$98.00
Today
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