External Tooth, Internal Tooth, Lock Washer, Full Washers, Form A
Steel, Ceramic, Copper, TPE, Nylon
12 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
6 mm, 2.1 mm, 21 mm, 12.2 mm, 6.5 mm
1 mm, 8.1 mm, 0.4 mm, 3 mm, 0.28 mm
M3, M12, M5 (Form A), M6, M5
DIN 7980, DIN 127B, BS 4320G, DIN 7603, DIN 125A