The 1010 carbon steel flat washer has a black oxide finish and is made in USA. The flat washer provides a bearing surface for fastener load distribution or is used as a spacer between components. The 1010 carbon steel grade is often used in applications where toughness is the primary consideration. The black oxide finish offers mild corrosion resistance and lubricity.

Washers distribute the load of a fastener across a surface and can also be used as spacers, springs, shims, or locking devices. Several different washer styles fit a variety of application and installation requirements. The most common style is a flat washer. More specialized washers provide additional benefits. A cup washer, for example, helps protect fasteners from electrical currents, while a lock washer offers additional security in an assembled workpiece.