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PTFE (Polytetrafluoroethylene) Flat Washer, 1/2' Hole Size, 0.505' ID, 0.750' OD, 0.031' Nominal Thickness, Made in US (Pack of 25): Industrial & Scientific. PTFE (Polytetrafluoroethylene) Flat Washer, 1/2" Hole Size, 0.505" ID, 0.750" OD, 0.031" Nominal Thickness, Made in US (Pack of 25): Industrial & Scientific. The PTFE flat washer is made in USA. 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. 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.。 。 。 。