Unitized axle spindle nut. Six sides, 3-1/4 inch-12 thread, 4.375 inch outside diameter, 1.000 inch thickness. For use Eaton, Ford, Freightliner, IHC, Kenworth, Mack 50,000 lb Axles, Meritor, Peterbilt, Spicer 34,000-46,000 lb, Volvo, Western Star 30,000 - 46,000 lb tandem axles. Replaces Stemco numbers 4494973 nd 449-4973.