NBC Wheel Hub BearingsNN3013KM C3 to OH3048

A wheel hub bearing (also called a hub unit or hub assembly) is an integrated bearing system that connects the wheel to the vehicle’s axle. It allows smooth rotation of the wheel while supporting the vehicle’s weight and maintaining alignment.

2. Construction:
A typical wheel hub bearing unit consists of:

• Inner and outer rings (races): Precision ground steel rings that house the rolling elements.

• Rolling elements: Usually balls or rollers (depending on design).

• Cage: Keeps the rolling elements evenly spaced.

• Seals: Protect against dust, dirt, and moisture.

• Flange / Hub: The mounting face that connects directly to the wheel and brake disc.

Modern hub units (Gen 2 or Gen 3 designs) may also include:

• ABS speed sensors (for anti-lock braking systems).

• Pre-lubrication and pre-adjusted clearance, eliminating the need for maintenance.