American National Thread Formulas  
THREAD PITCH = 1/N Depth of Thread

D = .6495/N 

or P x .6495

 WIDTH OF FLAT

F = .125/N 

or P/8
10-24      
1/4-20      
5/16-18      
3/8-24      
7/16-14      
1/2-13      
9/16-27      
11/16-16      
15/16-9      
1-8      
1.125-7      
4-4      

Last Updated on 2/10/2001
By Errol Groff