Thread Decoder

Enter the callout the way it's written on the print, the bin label, or the bolt head. The decoder identifies the thread and answers from verified standards data — it never computes a spec for a thread it can't verify.

Accepts 1/4-20 1/4 28 UNF #10-32 M8×1.25 M6 and similar variants.

Have an unmarked bolt instead of a callout?

Two measurements identify almost any thread. Measure the outside diameter — it reads just under the nominal size — then determine the pitch, and enter the result above (e.g. 1/4-20 or M8x1.25).