Quantity: 120pcs per pack. Size: 1/2" ID x 1" OD, exactly ID about 13mm. Thickness: 1mm. Type: Flat washer, easy to use, high usability, more convenient to use. Material: Made of quality 304 stainless steel, corrosion resistant ductility at high temperatures, low magnetic permeability, last long service life. Function: Flat washer provides a bearing surface for fastener load, disperse the pressure of the bearing surface of the fastener such as bolts to protect the surface of the connected part. Common in auto-body repair, sheet metal, plumbing, and electrical applications.

Washers refer to the parts that are placed between the connected part and the nut. It is generally a flat metal ring, which is used to protect the surface of the connected piece from being scratched by the nut, and to disperse the pressure of the nut on the connected piece. 

Function of stainless steel flat washer is to increase the contact (bearing) area, disperse and reduce the compressive stress between the nut and the fastened parts, prevent local compression and deformation due to the action of the fastening force, and generally enhance the fastening effect.