Miniature, lightweight, Non-locking , Self-locking, Keylocking Threaded Inserts A286 S/S; 303 S/S; 4140 Alloy Steel solid wall inserts also see NAS1394 perfomance specification is Mil-I-45914A ; For all Solid Wall insert styles and materials try MS51830, MS51831, :MS51830E, MILITARY SPECIFICATION SHEET, INSERT, SCREW-THREAD, LOCKED IN, KEY LOCKED, MINIATURE AND LIGHTWEIGHT (9 MAR 1992)