Panel screws come pre-assembled with Split L, Internal Tooth L, or External Tooth L washers, and are available in nine head styles. Four come slotted or Phillips: pan head, fillister, round head, and flat head; binding head comes slotted only. Other styles include socket head cap, hex head machine, hex socket flat captive head, and hex socket low head. The panel screw assembly comes with silicon-bronze split-lock washers, copper alloy No. 651 or 655, internal or external phosphor bronze lock washers, copper alloy No. 510, and brass flat washers No. 260.
Accurate Machine Screw Co., 10 Audrey Place, Fairfield, NJ 07004.