The Timken Company 471391 National Oil Seal

The Timken National Oil Seal 471391 is a double-lip, spring-loaded oil seal from Timken’s National 470000 series designed to retain lubricants and block dirt, moisture, and other contaminants in rotating shaft assemblies. It features nitrile (NBR) lip material in a solid, inner‑case‑less construction with an inch‑based ID of 1.937 in (49.20 mm), OD of 3.130 in (79.50 mm), housing bore of 3.125 in (79.38 mm), and overall width of 0.375 in (9.525 mm), with Redi‑Coat available. Rated for up to 3000 ft/min shaft surface speed and a misalignment tolerance of 0.015 in at 800 rpm (0.010 in at 4200 rpm), it operates from -40°F to 225°F (-40°C to 107°C) and is commonly used in general purpose rotating equipment such as industrial gearboxes, pumps, electric motors, and conveyor systems, making it a typical replacement for SKF and CR (Chicago Rawhide) equivalents in the National 470000 series.