Machine Screw 4-40 x 1/2" p-ph-sems

#4 machine screw used in Williams/Bally games. Used to secure pop bumper cap on A-12854 flange and stud assembly or rod and ring assembly.

Reference:

Williams 4004-01003-08Capcom SC-00120-04

Machine screw with 4-40 thread and 1/2" long with phillips pan head and integrated external tooth lockwasher.

Basic diameters and threads of Standard SAE numeric system small machine screws are shown below.

The diameters of machine screws are indicated with the number of threads per inch count.

Here is a list of common sizes in inches:

2-56: 0.0860" or 43/500" in diameter; 56 threads per inch4-40: 0.1120" or 14/125" in diameter; 40 threads per inch5-40: 0.1250" or 1/8" in diameter; 40 threads per inch6-32: 0.1380" or 69/500" in diameter; 32 threads per inch8-32: 0.1640" or 41/250" in diameter; 32 threads per inch10-32: 0.1900" or 19/100" in diameter; 32 threads per inch10-24: 0.1900" or 19/100" in diameter; 24 threads per inch12-24: 0.2160" or 27/125" in diameter; 24 threads per inch