|Coating||Black, Electro Galvanized, Hot Dip Galvanized, PTFE, Yellow|
|Grade||125, F436, F436M|
|Standard||DIN, ASTM in Metric and Imperial Size|
|Dia Range||M03 to M100 and 3/16” to 4”|
A Flat washer is a thin plate (typically disk-shaped) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener. High quality cap screws require hardened steel washers to prevent the loss of pre-load. These washers are also important for preventing galvanic corrosion, particularly by insulating steel screws from aluminum surfaces.