Machine post screw is 2" long and has #6-32 threads on both sides. These are commonly used to anchor the plastic posts to the playfield and the playfield plastics
Uses nylon 6-32 acorn, chrome acorn, or nylock nuts. Part numbers HWNT-0010 , HWNT-0011 , HWNT-0001
Data East #530-5012-02
Williams #02-9899