Socket cap, Zinc plated alloy steel

Socket cap diameter is measured on the outside of the threads.

Socket cap diameter

Resources

Diameter and Thread count
Coarse (standard) thread #6-32 #8-32 #10-24 #10-32 * 1/4"-20 5/16"-18 3/8"-16 Fine thread #10-32

* 10-32 is a fine thread, but it is listed under coarse thread because it is very common.