SM05-Threaded Optical Component Adapters
This page contains all of our Optical Component Thread Adapters that feature SM05 (0.535"-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 SM05 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 External SM05 and Internal Industry-Standard Threads
Item #
Typical Application
External Threads
Internal Threads
SM1A1 Step Up/Down Lens Tube Size
SM05 (0.535"-40)SM1 (1.035"-40)
Adapters with Internal SM05 and External Industry-Standard Threads
Item #
Typical Application
External Threads
Internal Threads
SM05RMS Create Objective from Lens Tube
RMS (0.800"-36)
SM05 (0.535"-40)
SM05A2 Mount an Externally Threaded SM05 Lens Tube to a C-Mount Camera Body
C-Mount (1.00"-32)
SM05 (0.535"-40)
SM1A6 Step Up/Down Lens Tube Size
SM1 (1.035"-40)SM05 (0.535"-40)
SM1A6T Mount Thin Ø1/2" Optics in SM1 Lens Tube
SM1 (1.035"-40)SM05 (0.535"-40)
SM1A6FW
Mount SM05 Lens Tube to an SM1-Threaded Filter Wheel
SM1 (1.035"-40)SM05 (0.535"-40)
Adapters with External SM05 and External Industry-Standard Threads
Item #
Typical Application
External Threads
External Threads
SM05T2 Mate Two Internally Threaded SM05 Lens Tubes
SM05 (0.535"-40)SM05 (0.535"-40)
SM05A1 Mount an Internally Threaded SM05 Lens Tube to a C-Mount Camera Body
SM05 (0.535"-40)C-Mount (1.00"-32)
SM05A3
Mate an SM05 Lens Tube to an SM1 Lens Tube
SM05 (0.535"-40)SM1 (1.035"-40)
Adapters with Internal SM05 and Internal Industry-Standard Threads
Item #
Typical Application
Internal Threads
Internal Threads
SM05T1 Mate Two Externally Threaded SM05 Lens Tubes
SM05 (0.535"-40)SM05 (0.535"-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 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, M30.5x0.5
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"
SM4 Threading: Ø4" Fixed Lens Mounts
External Thread, 4.035"-40.0, 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"
Additional Optical Component Thread Adapters
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SM05-Threaded Adapters