Timken National 417278 Radial Shaft Oil Seal

The Timken National 417278 is a radial shaft oil seal designed to retain lubricants and prevent contaminants from entering rotating equipment, making it suitable for general‑purpose industrial sealing in gearboxes, pumps, electric motors, conveyors, and compressors. Its Type 41, 410000‑series construction uses a spring‑loaded multi‑lip seal with a nitrile (NBR) element to minimize leakage while resisting dirt and moisture. Key dimensions include a 5.000 in (127.000 mm) shaft diameter, 6.381 in (162.077 mm) outside diameter, 6.375 in (161.925 mm) housing bore, and 0.500 in (12.700 mm) overall width, housed in a steel case with inner case and Redi‑Coat. It supports up to 3000 ft/min shaft speed, with misalignment tolerance of 0.015 in at 800 rpm and 0.010 in at 4200 rpm, a 7 psi pressure rating, and an operating temperature range of -40°F to 225°F (-40°C to 107°C). Common replacements include SKF 50130, CR 417278, and National 417278.