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Stemco · Hardware & Fasteners
449-4973-NL
In stock · ships from Knoxville
The Stemco Pro-Torq spindle nut (part number 449-4973) is a one-piece, locking axle nut designed for drive axles on heavy-duty trucks.
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Fits 3-1/4-12 spindle threads. Requires 4-3/8 inch 8-point socket (OTC# 1917). Verify outer bearing cup/cone (580/572) and thread size before ordering. The -NL suffix may be an internal dealer code; the actual part matches Stemco 449-4973.
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It uses an integrated keeper to provide precise and controlled bearing adjustment, which helps extend the life of wheel seals and bearings while reducing maintenance intervals. This nut replaces conventional jam nut and lock washer systems, and is typically installed when servicing wheel bearings or upgrading to a Pro-Torq wheel-end system. The -NL suffix is likely an internal dealer code, and the actual part is identical to the standard Stemco 449-4973.
Part Number: 449-4973-NL
PRO TORQUE AXLE NUT
Dealer: Knox Trailers
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