Item # |
Internal Threads |
External Threads |
M32RMSS |
RMS (0.800"-36) |
M32 x 0.75 |
M32M25S |
M25 x 0.75a |
M32SM1S |
SM1 (1.035"-40) |
M32M26S |
M26 x 0.706 |
M32M27S |
M27 x 0.75 |
M32M271S |
M27 x 1.0 |
M32M34S |
M34 x 1.0b |
M32M40S |
M40 x 0.706 |
M2M32S |
M32 x 0.75 |
SM2 (2.035"-40) |
M2M34S |
M34 x 1.0b |
M2M40S |
M40 x 0.706 |
Features
- Externally M32 x 0.75-Threaded Adapters Compatible with Bergamo® and Cerna® Microscope Systems
- Externally SM2-Threaded Adapters Compatible with the CSA2100 Cerna Mounting Arm
- Internal Threading Compatible with Olympus, Nikon, Zeiss, and Leica Objectives
- Lip Prevents Over-Threading into Microscope Nosepieces
- Solid Brass Construction
These Brass Microscope Adapters can mate an externally threaded microscope objective to an internally M32 x 0.75- or SM2-threaded nosepiece. The design includes a flange to prevent over-threading the adapter or the objective into a microscope nosepiece, keeping the objective at the proper position and preventing damage to the optics inside the housing. In addition, the brass construction is harder than aluminum which reduces thread binding. Each adapter has spanner wrench holes or slots for compatibility with our SPW801 Adjustable Spanner Wrench to help thread the adapters into a microscope nosepiece.
To view our entire line of thread adapters, please see our Interactive Adapters Selection Guide.
Item # |
Typical Application |
External Threads |
Internal Threads |
M32RMSS |
 |
Integrate RMS Objective with M32 x 0.75 Mount |
M32 x 0.75 |
RMS (0.800"-36) |
M32M25S |
 |
Integrate M25 x 0.75 Objective with M32 x 0.75 Mount |
M32 x 0.75 |
M25 x 0.75 |
M32SM1S |
 |
Integrate SM1 Lens Tube with M32 x 0.75 Mount |
M32 x 0.75 |
SM1 (1.035"-40) |
M32M26S |
 |
Integrate M26 x 0.706 Objective with M32 x 0.75 Mount |
M32 x 0.75 |
M26 x 0.706 |
M32M27S |
 |
Integrate M27 x 0.75 Objective with M32 x 0.75 Mount |
M32 x 0.75 |
M27 x 0.75 |
M32M271S |
 |
Integrate M27 x 1.0 Objective with M32 x 0.75 Mount |
M32 x 0.75 |
M27 x 1.0 |
M32M34S |
 |
Integrate M34 x 1.0 Objective with M32 x 0.75 Mount |
M32 x 0.75 |
M34 x 1.0 |
M32M40S |
 |
Integrate M40 x 0.706 Objective with M32 x 0.75 Mount |
M32 x 0.75 |
M40 x 0.706 |
M2M32S |
 |
Integrate M32 x 0.75 Objective with SM2 Mount |
SM2 (2.035"-40) |
M32 x 0.75 |
M2M34S |
 |
Integrate M34 x 1.0 Objective with SM2 Mount |
SM2 (2.035"-40) |
M34 x 1.0 |
M2M40S |
 |
Integrate M40 x 0.706 Objective with SM2 Mount |
SM2 (2.035"-40) |
M40 x 0.706 |
Thorlabs' Threading Specifications
Threading specifications are given below for our adapters so that you can machine mating components to suit your application. 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.
RMS Threading |
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" |
M25 x 0.75 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
24.977 mm |
Min Major Diameter |
25.000 mm |
Min Major Diameter |
24.837 mm |
Min Pitch Diameter |
24.513 mm |
Max Pitch Diameter |
24.49 mm |
Max Pitch Diameter |
24.659 mm |
Min Pitch Diameter |
24.379 mm |
Min Minor Diameter (and 83.3% of thread) |
24.188 mm |
Max Minor Diameter |
24.165 mm |
Max Minor Diameter (and 64.9% of thread) |
24.378 mm |
SM1 Threading |
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" |
M26 x 0.706 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
25.977 mm |
Min Major Diameter |
26.0 mm |
Min Major Diameter |
25.838 mm |
Min Pitch Diameter |
25.541 mm |
Max Pitch Diameter |
25.519 mm |
Max Pitch Diameter |
25.685 mm |
Min Pitch Diameter |
25.41 mm |
Min Minor Diameter (and 83.3% of thread) |
25.236 mm |
Max Minor Diameter |
25.213 mm |
Max Minor Diameter (and 64.9% of thread) |
25.417 mm |
M27 x 0.75 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
26.977 mm |
Min Major Diameter |
27.000 mm |
Min Major Diameter |
26.837 mm |
Min Pitch Diameter |
26.513 mm |
Max Pitch Diameter |
26.49 mm |
Max Pitch Diameter |
26.660 mm |
Min Pitch Diameter |
26.378 mm |
Min Minor Diameter (and 83.3% of thread) |
26.188 mm |
Max Minor Diameter |
26.165 mm |
Max Minor Diameter (and 64.9% of thread) |
26.378 mm |
M27 x 1.0 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
26.95 mm |
Min Major Diameter |
27.0 mm |
Min Major Diameter |
26.58 mm |
Min Pitch Diameter |
26.35 mm |
Max Pitch Diameter |
25.0 mm |
Max Pitch Diameter |
26.52 mm |
Min Pitch Diameter |
24.8 mm |
Min Minor Diameter (and 83.3% of thread) |
25.917 mm |
Max Minor Diameter |
23.704 mm |
Max Minor Diameter (and 64.9% of thread) |
26.153 mm |
M32 x 0.75 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
31.977 mm |
Min Major Diameter |
32.000 mm |
Min Major Diameter |
31.837 mm |
Min Pitch Diameter |
31.513 mm |
Max Pitch Diameter |
31.49 mm |
Max Pitch Diameter |
31.663 mm |
Min Pitch Diameter |
31.376 mm |
Min Minor Diameter (and 83.3% of thread) |
31.188 mm |
Max Minor Diameter |
31.165 mm |
Max Minor Diameter (and 64.9% of thread) |
31.378 mm |
M34 x 1.0 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
33.974 mm |
Min Major Diameter |
34.000 mm |
Min Major Diameter |
33.794 mm |
Min Pitch Diameter |
33.350 mm |
Max Pitch Diameter |
33.324 mm |
Max Pitch Diameter |
33.520 mm |
Min Pitch Diameter |
33.199 mm |
Min Minor Diameter (and 83.3% of thread) |
32.917 mm |
Max Minor Diameter |
32.891 mm |
Max Minor Diameter (and 64.9% of thread) |
33.153 mm |
M40 x 0.706 Threading |
External Thread |
Internal Thread |
Max Major Diameter |
39.969 mm |
Min Major Diameter |
40.000 mm |
Min Major Diameter |
39.830 mm |
Min Pitch Diameter |
39.542 mm |
Max Pitch Diameter |
39.511 mm |
Max Pitch Diameter |
39.670 mm |
Min Pitch Diameter |
39.414 mm |
Min Minor Diameter (and 83.3% of thread) |
39.236 mm |
Max Minor Diameter |
39.206 mm |
Max Minor Diameter (and 64.9% of thread) |
39.405 mm |
SM2 Threading |
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" |