Machine Screw 8-32 x 3/4 inch p-ph-sems

Basic diameters and threads of Standard SAE (Society of American Engineers) numeric system small machine screws are shown below.

The diameters of machine screws are indicated with the number of threads per inch. Here is a list of common sizes in inches:

2-56: 0.0860" or 43/500" in diameter; 56 threads per inch
4-40: 0.1120" or 14/125" in diameter; 40 threads per inch
5-40: 0.1250" or 1/8" in diameter; 40 threads per inch
6-32: 0.1380" or 69/500" in diameter; 32 threads per inch
8-32: 0.1640" or 41/250" in diameter; 32 threads per inch
10-32: 0.1900" or 19/100" in diameter; 32 threads per inch
10-24: 0.1900" or 19/100" in diameter; 24 threads per inch
12-24: 0.2160" or 27/125" in diameter; 24 threads per inch 

Reference:

4008-01003-12