Industrial 5751 Oil Seal

The Timken National Oil Seal 5751 is a rotary shaft seal engineered to retain lubricant inside gearboxes, pumps, and other rotating equipment while preventing dirt and moisture from entering bearing housings. With a 3.125 in shaft bore and a 4.567 in outside diameter, this single-lip, leather-lip seal from the 5000 series features a Type 34 cross section and a solid construction that fits a 1.198 in overall width. The lip is without a spring, offering a simple, robust sealing surface suitable for demanding industrial and mobile machinery. Its temperature rating spans -50 to 200 °F (-46 to 93 °C), enabling use across a wide range of operating environments. Typical applications include industrial gearboxes, wheel-end assemblies, heavy-duty axles, pumps, conveyors, agricultural equipment, and other rotating systems requiring reliable lubricant retention and contamination protection. The part is identified by manufacturer part number 5751 and is listed as a Timken (National) oil seal, with common replacements including National 5751, SKF 5751, and CR 5751.