External Tooth, Internal Tooth, Lock Washer, Full Washers, Form A
Steel, Ceramic, Vulcanised Fibre, Stainless Steel, Brass
4.51 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
3.2 mm, 6.4 mm, 2.25 mm, 4.36 mm, 6.5 mm
0.16 mm, 3.5 mm, 0.6 mm, 1.6 mm, 0.28 mm
M3 (Form A), M20, M24, M5 (Form A), M16
DIN 7980, DIN 6797A, BS 4320B, DIN 127B, ASME B18.8.1