Stemco 448‑4864 Pro‑Torq® Spindle Nut – 2″‑12 TPI (Mack Steer Axle)

High‑Performance Axle Spindle Nut for Heavy‑Duty Commercial Trucks

🔧 Key Features:

• Thread Size: 2″‑12 thread (2" diameter, 12 threads per inch)

• Axle Fitment: Designed for Mack steer axles (FA18, FAW18, FA616, FAW616, FA20, FAW20, FA617, FAW617, etc.)

• Bearing Cone Compatibility: 555S / 552A series

• Tool Socket: Uses 3″, 6‑point OTC‑1906/1906M socke

• Keeper Included: Ships complete with keeper / retaining ring (part #450‑4864)

🔄 Cross-Reference & Interchangeability:

• Stemco Keeper (replacement): 450‑4864

• Zip‑Torq® Equivalent: 400‑4864

• Euclid Equivalent: EUCLID E‑1906

These cross-references ensure compatibility with Zip‑Torq systems and alternative OEM brands—making part sourcing and inventory management simpler.

⚙️ Why Choose the Pro‑Torq Nut?

1. Precision Bearing Adjustment: Fine-tune bearing end-play in 0.001″ increments—dramatically improving tire life and wheel seal integrity

2. Single-Nut Efficiency: Eliminates jam-nut variability, reducing assembly time and the risk of over tightening

3. ABS Reliability: Tight end-play control ensures accurate wheel-speed sensing for ABS systems

4. Extended Component Life: Induction-hardened contact surface aligns bearing cups/cones for extended durability

📏 Technical Summary: