Figuring out suppressor thread

[P38]

raumati01

For a Metric thread measure the outside diameter of the threads.

Then measure the pitch from top of one thread to top of next.

i.e. a M8x1.0 thread will be 8mm in diameter and 1mm from one thread top to the next.

Or maybe it's an Imperial thread then measure the outside diameter and count threads per inch.

i.e. .3/8 x16unc = 3/8ths of and inch in diameter by 16 threads per inch.

THREAD IDENTIFICATION CHART

or take it into an engineering shop and ask them to identify it for you.

Cheers
Pete