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Optical Component Threading Adapters with SM3 (3.035"-40) Threads


  • Integrate SM3-Threaded Components with Other Industry Standard Threads
  • Adapters Available with Either Internal or External SM3 Threads

SM3L10

SM3A1

SM1L10

SM3A1 Adapter
Connecting an SM3
Lens Tube to an
SM1 Lens Tube

SM3A2

External SM2 Threads
and Internal SM3 Threads

SM3T2

External SM3 Threads
with Locking Nuts

SM3A95

External M95 x 1.0 Threads
and Internal SM3 Threads,
60 mm Cage Compatible

Related Items


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Interactive Selection Guide

SM3-Threaded Optical Component Adapters

This page contains all of our Optical Component Thread Adapters that feature SM3 (3.035"-40) threading. Adapters that have both internal and external threads are available, as well as adapters with two sets of internal or external threads.

Our SM3 adapters are a subset of our entire line of optical component thread adapters. To view our entire line, please see our Interactive Adapters Selection Guide.

Adapters with Internal SM3 and External Industry-Standard Threads
Item #Typical ApplicationExternal
Threads
Internal
Threads
SM3A1
info
Step Up/Down Lens Tube Size SM1 (1.035"-40) SM3 (3.035"-40)
SM3A2
info
Step Up/Down Lens Tube Size SM2 (2.035"-40) SM3 (3.035"-40)
SM3A95
info
Adapt M95 x 1.0 Components to SM3 Lens Tubes, 60 mm Cage Compatiblea M95 x 1.0 SM3 (3.035"-40)
  • Note: SM3 lens tubes do not fit inside 60 mm cage assemblies.

Adapters with Internal SM3 and Internal Industry-Standard Threads
Item #Typical ApplicationInternal ThreadsInternal Threads
SM3T1 info Mate Two Externally Threaded SM3 Lens Tubes SM3 (3.035"-40) SM3 (3.035"-40)
Adapters with External SM3 and External Industry-Standard Threads
Item #Typical ApplicationExternal ThreadsExternal Threads
SM3T2
info
Mate Two Internally Threaded SM3 Lens Tubes SM3 (3.035"-40) SM3 (3.035"-40)






Adapters with External SM3 and Internal Industry-Standard Threads
Item #Typical ApplicationExternal ThreadsInternal Threads
SM3A3 info Step Up/Down Lens Tube Size SM3 (3.035"-40) SM2 (2.035"-40)

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
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"

Posted Comments:
dikkhairs  (posted 2014-09-17 17:54:11.71)
I several applications that I would like to use but I need a device
jlow  (posted 2014-09-25 09:37:30.0)
Response from Jeremy at Thorlabs: We will contact you directly to discuss about the requirements for your applications.

Adapter with External SM3 (3.035"-40) and Internal Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM3A3 Support Documentation
SM3A3Customer Inspired! Adapter with External SM3 Threads and Internal SM2 Threads
$32.20
Today

Adapters with Internal SM3 (3.035"-40) and External Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM3A1 Support Documentation
SM3A1Adapter with External SM1 Threads and Internal SM3 Threads
$32.20
Today
SM3A2 Support Documentation
SM3A2Adapter with External SM2 Threads and Internal SM3 Threads
$32.20
Today
SM3A95 Support Documentation
SM3A95Customer Inspired! Adapter with External M95 x 1.0 and Internal SM3 Threads, 60 mm Cage System Compatible
$49.78
Today

Adapter with External SM3 (3.035"-40) and External Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM3T2 Support Documentation
SM3T2SM3 (3.035"-40) Lens Tube Coupler, External Threads
$41.12
Today

Adapters with Internal SM3 (3.035"-40) and Internal Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM3T1 Support Documentation
SM3T1Customer Inspired! SM3 (3.035"-40) Coupler, Internal Threads
$30.57
Today
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