Clevite TW-458S Engine Crankshaft Thrust Washer Set Thrust washers limit axial movement and provide a bearing surface. Thrust bearings are designed to support axial load. Thrust washers either have multiple tapered ramps and relatively small flat pads or have curved surfaces that follow a sine wave contour around their circumference. Tear-drop or through grooves on the flange faces and wedge shaped ramps at each parting line allow engine oil to enter between the shaft and bearing surfaces. Manufactured to meet or exceed OE specifications