Cup, Mudguard, Internal Tooth, Full Washers, Form A
TPE, Copper, Steel, Nylon, Brass
12 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
21 mm, 10.5 mm, 5.3 mm, 2.25 mm, 6.5 mm
2.5 mm, 0.9 mm, 1.8 mm, 0.28 mm, 8.1 mm
M8, M3 (Form A), M24, M2, M5 (Form A)
DIN 127B, ASME B18.22.1
ASTM F844, BS 4320G, DIN 7980, BS 4320B