CRW5 (fig 1) and CRWA5 (fig 2) seals (CR539036, HMSA7SP SEAL 39.7*54.23*12.29 VITON) are designed to withstand moderate pressure differentials. They have an SKF WAVE lip to reduce heat generation and a metal outside diameter for easy installation and a firm and accurate fit in the housing bore. For additional information, refer to the section Sealing lip design. Most of them have SKF Bore Tite Coating on the outside diameter. The CRWA5 seals have an auxiliary lip, providing additional contaminant exclusion ability. A shoulder or retaining ring should be used at the low-pressure side of the seal to prevent it from being pressed out of the housing bore.
 
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