10-32 strings are generally the first rack screw type. The term 10-32 comes from Unified and American Screw Threads for Bolts, Nuts, and Machine Rack Screws principles distributed by ANSI B1.1-1974. The number "10" is just a size designator with no mathematical significance. The number "32" alludes to 32 strings for every inch. You can recognize a 10-32 Rack bolt screw by estimating the measurement with a ruler at precisely 3/16″ (0.190″).
