Internal Tooth, Plain Washer, Flat Washers, Full Washers, Form A
Fibre, Steel, Brass, TPE, Nylon
9.09 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
4.85 mm, 2.1 mm, 5.36 mm, 13 mm, 6.5 mm
1.2 mm, 1.8 mm, 0.28 mm, 8.1 mm, 0.5 mm
M6, M3 (Form A), M12, M16, M5 (Form A)
DIN 7603, BS 4463, BS 4320, DIN 7980, BS 4320B