Or you can revert to the simple but demanding process of measuring how many threads are in an inch. 3. Determine size. There are two methods for sizing threads: one for pipe threads and one for ...

For example, drill size for a 3/8-16 thread is 0.375 0.0625 (pitch) = 0.312 in. in diameter, and for a 10-32 thread, the drill diameter is 0.190 0.032 = 0.159 in. (a #21 drill). This formula works for ...