The Timken Company 8976S Radial Shaft Oil Seal

The Timken National 8976S oil seal is a single-lip radial shaft seal engineered to retain lubricants while excluding dirt, dust, moisture, and other contaminants in rotating equipment. Manufactured from nitrile (Buna-N) rubber, it delivers reliable sealing for industrial gearboxes, wheel hubs, axles, pumps, electric motors, agricultural equipment, construction machinery, and power transmission systems. Key specifications include MPN 8976S, Series 8000, Seal Design Type 49, shaft diameter 3.125 in (79.38 mm), housing bore diameter 4.173 in (106.00 mm), outside diameter 4.179 in (106.15 mm), and overall width 0.290 in (7.37 mm). The spring-loaded lip enhances lubricant retention and contaminant exclusion across standard nitrile seal operating temperatures. Common replacements include SKF 8976S Oil Seal, CR (SKF Chicago Rawhide) equivalent, and Federal-Mogul/National 8976S Oil Seal. This seal is used in rotary shaft sealing applications such as industrial gearboxes, wheel-end assemblies, agricultural and construction equipment, pumps, and power transmission systems requiring reliable lubricant containment.