I doubt that you will be able to find a US thread that will work in a Whitworth threaded hole. The US threads are cut with a 60 degree angle and a sharp vee top and bottom, while the
Whitworth is cut with a 55 degree angle, and the tops and bottoms of the threads are rounded. You probably can find taps and dies to cut Whitworths on the internet. A good investment for anyone who works on mechanical things is a book called "Machinery's Handbook". For your purposes, a used one several years old is good enough, as the basic info you need has not changed in the last 50 or more years.
Last edited by Tom Martin; 12/16/16 10:41 PM.
