The Timken Company 8521S Radial Shaft Oil Seal

The Timken National 8521S oil seal is a nitrile (Buna-N) radial shaft seal with a springless multi-lip design (Type 200E) that seals in lubricants while excluding dirt and moisture in rotating equipment. This 8000 Series seal fits a 1.872 in (47.55 mm) shaft, with a 2.684 in (68.17 mm) housing bore and a 2.701 in (68.61 mm) outside diameter, and it is 0.544 in (13.82 mm) wide. Operating from -40°F to 225°F (-40°C to 107°C) and rated at 60–80 Shore A, it weighs about 0.105 lb (0.048 kg). Common applications include industrial gearboxes, wheel hubs, axles, pumps, compressors, electric motors, agricultural equipment, and power transmission systems, with SKF 18510 and Federal-Mogul National 8521S as typical replacements.