A T2 thread, also written T-2, has a diameter of 42mm and a thread pitch of 0.75mm. It is also sometimes written as M42x0.75.
The low pitch distinguishes it from other M42 threads.
Omegon
C-mount male to T2 adapter female
$ 24.90
ready for shipping in 24
h
Omegon
Adapter M48 male to T2-thead ring female
$ 24.90
ready for shipping in 24
h
Omegon
Adapter T2 male to c-mount male
$ 34.90
ready for shipping in 24
h
Omegon
Adapter T2 male to T2 male
$ 19.90
ready for shipping in 24
h