Countersunk Washer, Cup, Plain Washer, Full Washers, Form A
Steel, TPE, Stainless Steel, Copper, Brass
4.51 mm, 3/4" X 3" X 1/4", 15.5 mm, 6.9 mm, 11.88 mm
4.36 mm, 4.85 mm, 12.5 mm, 13 mm, 6.5 mm
0.28 mm, 8.1 mm, 0.4 mm, 0.16 mm, 2.5 mm
M3, M24, M5 (Form A), M20, M4
DIN 6797J, ASTM F436, DIN 125A, BS 4320B, BS 4463