Internal Tooth, Cup, Crinkle, Full Washers, Form A
TPE, Vulcanised Fibre, Copper, Brass, Steel
12 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
3.2 mm, 2.25 mm, 13 mm, 4.36 mm, 6.5 mm
1.6 mm, 1.4 mm, 5.8 mm, 0.3 mm, 0.28 mm
M2.5, M16, M3 (Form A), M12, M5 (Form A)
DIN 6797A, BS 4320B, DIN 7980, BS 4320, BS 4463