The flat pad is mainly stamped out of an iron plate. The shape is generally a flat gasket with a hole in the middle. There is a calculation formula in the "Quality Encyclopedia of Standard Fasteners" published by China Standard Publishing House. The formula is: weight of one thousand pieces m = 0.00785 × {3.1416/4 × Washer height × [square of outer diameter - square of inner hole diameter]

The role of flat pads

1. Increase the contact area between the screw and the machine.
2. Eliminate the damage to the surface of the machine by the spring pad when unloading the screws. When using it, it must be a spring pad and a flat pad. The flat pad is next to the surface of the machine, and the spring pad is between the flat pad and the nut.