Cup, Internal Tooth, Plain Washer, Full Washers, Form A
Brass, Nylon, Stainless Steel, Steel, Copper
4.51 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
2.1 mm, 10.5 mm, 12.5 mm, 5.3 mm, 6.5 mm
1 mm, 0.9 mm, 8.1 mm, 1.2 mm, 1.1 mm
M20, M5 (Form A), M5, M3, M6
DIN 127B, DIN 6797A, BS 4320B, BS 4320:1968, BS 4463