22.Size: #6 X 5/16 inch ODMost commonly used and versatile washerIncreases bearing surface and distributes load over a larger areaCan be used to prevent a screw or bolt from going into a hole too farCan also be used as spacers by stacking more than oneSpecification(s) Met: ASME B18.Flat Washer, Fits Bolt Size #6 ,Stainless Steel Plain Finish, 100 PK They distribute the force from the bolt head & nut over a larger area which serves to protect the surface of the material you are working with.1.