Library › Cameras & lenses › C-mount (1-32 UN): 17.526 mm flange, thread rings; CS-mount

1-32 UN (C-mount) internal thread ring section

1-32 UN (C-mount) internal thread ring section: ISO 68-1 basic profile, minor Ø24.541, pitch Ø24.884, major Ø25.4, pitch 0.79375; 6.35 long (8 turns), outside Ø29.4 (design choice); exact nominal, no tolerance

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

parameter	thread
value	1-32 UN (2A)
from	standard

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From the full sheet

C-mount (1-32 UN): 17.526 mm flange, thread rings; CS-mount: every size, notes, mating features and sources. What is the C-mount flange focal distance?

Other sizes

1-32 UN (C-mount) external thread ring section