External Tooth, Cup, Lock Washer, Full Washers, Form A
Brass, Copper, Steel, Ceramic, TPE
4 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
3.2 mm, 12.2 mm, 6.4 mm, 21 mm, 6.5 mm
0.6 mm, 0.4 mm, 8.1 mm, 2 mm, 3.5 mm
M10, M16, M5 (Form A), M12, M2.5
ASME B18.21.1, BS 4320B, BS 4320, DIN 6797J, DIN 7603A