Description
Ensure perfect bearing alignment and friction-free rotation for your commercial car transporter with this premium inner wheel bearing cup.
The Traction Part Number 3920 (interchanging with Dexter factory code 031-019-01) is a precision-ground tapered roller bearing cup (race) engineered specifically for maximum-duty commercial utility trailer hubs. Serving as the outer ring for the inner wheel assembly, this cup is pressed tightly into the hub casting to provide a perfectly smooth, hardened surface for the roller cone. Its highly specialized taper angle is designed to handle extreme radial loads and axial thrust forces, keeping your heavy-haul wheel ends completely stabilized during long-distance vehicle transport.
Fleet Application:
Sun Country Trailers: This inner bearing race is the exact factory-spec fitment pressed into the hubs of Sun Country multi-car carriers and low-profile transport trailers running heavy-capacity axles.
Technical Specifications & Fitment:
Industry Part Number: 3920 (Cup / Race)
Outer Diameter (OD): 4.4375 Inches
Axle Position: Inner Hub Assembly
Axle Weight Capacities: Engineered for 12,000 lbs. to 15,000 lbs. commercial trailer axles.
Hub Compatibility: Designed to press directly into industry-standard low-profile 9281X commercial brake drums and Dexter 12K–15K hub castings.
Performance Features:
Premium High-Alloy Steel: Manufactured from case-hardened structural steel to resist structural deformation, scoring, and pitting under heavy-haul payload stress.
Precision Machined Tolerance: Features a flawless micro-finish surface to promote constant lubrication film thickness, significantly lowering operating friction and wheel-end heat build-up.
Perfect Companion Fit: Engineered to mate seamlessly with the matching 3984 inner bearing cone to form a complete, high-capacity inner wheel bearing assembly.