Library › Cameras & lenses › T-mount (T2): M42 × 0.75 thread, 55 mm flange, thread rings

M42 × 0.75 (T2) external thread ring section

M42 × 0.75 (T2) external thread ring section: ISO 68-1 basic profile, major Ø42, pitch Ø41.513, minor Ø41.188, pitch 0.75; 6 long (8 turns), bore Ø37.188 (wall is a 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	M42 × 0.75
from	standard

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From the full sheet

T-mount (T2): M42 × 0.75 thread, 55 mm flange, thread rings: every size, notes, mating features and sources. What is the T-mount (T2) flange focal distance?

Other sizes

M42 × 0.75 (T2) internal thread ring section