Socket-Head Cap Screws (Grade 8) are used in all of our modular-fixturing systems for fastening non-locating components. In Mini-size modular systems, these cap screws are also used with Locating Bushings to mount locators. Available for Mini (5/16-18), Standard (1/2-13, and Heavy (5/8-11) modular systems, each in a choice of several lengths. Socket-Head Cap Screws are also available in thread sizes #6-32, #10-32, 1/4-20, 3/4-10, and 1″-8 (also M16 in metric). These sizes are used for fastening non-modular components to modular adaptors. The M16 size is used to fasten modular plates and blocks to machine pallets.