The WS locating washer is mounted on the shaft and serves as a raceway surface for the rolling elements with recommended operating temperatures from -20 degrees C to 120 C (-4 degrees F to 248 F) it is suited for a variety of applications. The WS series is manufactured in a low alloy and through-hardened chromium steel for durability with a high heat tolerance this range is manufactured to PN (normal) tolerances in accordance with DIN 620.