Description: The flat washer provides a bearing surface for fastener load distribution or is used as a spacer between components. PTFE (polytetrafluoroethylene) provides a low-friction surface and offers resistance to corrosion and most chemicals. 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.