Stemco Pro-Torq Axle Spindle Nut Thread

The Stemco Pro-Torq axle spindle nut (also called a wheel bearing adjusting nut or axle fastener) is a single-nut wheel-end system for heavy-duty truck and trailer axles. It sets wheel bearing adjustment precisely and repeatably. Nuts in this line come with an integrated keeper/lock.

Key Features:

• Precise bearing adjustment: Adjusts in increments as fine as 0.001 in. and keeps the bearing cup and cone aligned on the spindle.
• Controlled end play: The Pro-Torq procedure gives consistent, repeatable end play of 0.001 to 0.003 in. This limits axial motion and takes the guesswork out of bearing adjustment.
• Single-nut design: Replaces a two-nut jam-nut setup. It removes the risk of over-tightening a jam nut and pushing the outer bearing cone out of position, which creates a pre-load condition. It is also faster to install and easier to lock.
• Longer tire and seal life: Tight control of end play helps extend radial tire life and reduces premature seal failure from excessive end play or over-torqued adjustments.
• ABS support: Low, reliable end play helps keep wheel-speed monitoring accurate on anti-lock braking systems.
• Standardized maintenance: Supports seal, bearing, and axle manufacturers' specifications and gives mechanics one consistent procedure.

Stemco offers Pro-Torq spindle nuts in several thread sizes and drive styles for different axle and wheel-end applications. Choose the option that matches your spindle thread and bearing set. Pro-Torq helps fleets and owner-operators keep wheel ends running accurately and reduce maintenance costs per mile.