Internal Tooth, Cup, Plain Washer, Full Washers, Form A
Brass, Fibre, Steel, Vulcanised Fibre, TPE
28 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
3.2 mm, 6 mm, 2.25 mm, 8 mm, 6.5 mm
2.5 mm, 0.7 mm, 1.5 mm, 0.5 mm, 0.28 mm
M16, M2, M5 (Form A), M3, M10
BS 4463, BS 4320G, ASME B18.22.1
ASTM F844, BS 4320B, DIN 7603A