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Flat washer

Flat cushion, mainly stamped with iron plate, is generally a flat washer in shape, with a hole in the middle. There are formulas for calculating the quality of standard fasteners published by China Standard Press. The formulas are as follows: 1000 pieces weight M = 0.00785 * {3.1416/4 * * gasket height * [square of outer diameter - square of inner hole diameter]]