External Tooth, Lock Washer, Mudguard, Full Washers, Form A
Steel, Stainless Steel, Ceramic, Copper, Brass
28 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
3.2 mm, 4.85 mm, 2.1 mm, 13 mm, 6.5 mm
5.8 mm, 0.3 mm, 1.8 mm, 1.1 mm, 0.28 mm
M24, M5 (Form A), M16, M2.5, M3
BS 4320:1968, BS 4320G, DIN 127B, BS 4320, BS 4320B