MS17830 Mil-Spec Self Locking Hex Sheet Nut, Regular (Non Metallic Insert) 250 Deg. F and 450 Deg F, 300 Series Corrosion Resistant Steel (S/S by NASM17830 23 FEB 1998) Military Standard Self Locking Nuts are available in several sizes and types; other standards include: MS14145, MS14164, MS14182, MS14222, MS14491, MS16228, MS17829, MS17830, MS21042, MS21043, MS21044, MS21045, MS21046, MS21083, MS21084, MS21085, MS21133, MS21224, MS21225, MS21245, NAS1291, NAS577, NAS578: MS17830 MS17830E, MILITARY SPECIFICATION SHEET, NUT, SELF-LOCKING, HEXAGON-REGULAR, 250 °F, AND 450 °F (NON-METALLIC INSERT), 300 SERIES CORROSION RESISTANT STEEL (23 FEB 1998)