Internal Tooth, External Tooth, Plain Washer, Full Washers, Form A
TPE, Ceramic, Stainless Steel, Copper, Brass
4.51 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
17 mm, 2.1 mm, 6.4 mm, 5.36 mm, 6.5 mm
0.7 mm, 3.5 mm, 0.28 mm, 1.6 mm, 2.5 mm
M3, M12, M24, M5 (Form A), M2
BS 4320, BS 4320G, DIN 125A, DIN 7603A, BS 4320B