Wheel Bearings

Verified by Mel Sykes, Industrial Supply Chain Specialist - April 2026

Specification	Details
Types	Taper roller (most common), double row angular contact, hub bearing units
Standards	ISO 355
Application	Automotive front and rear wheels, trailers, industrial trolleys

What are Wheel Bearings?

Wheel Bearings are precision components that facilitate smooth rotation and support radial loads on wheel hubs. They consist of inner and outer rings with rolling elements-typically balls or rollers-that reduce friction.

Types and variants

The most common type is the taper roller bearing, followed by double row angular contact bearings and hub bearing units. Taper roller bearings feature tapered raceways and are typically used in automotive applications due to their high radial and axial load capacity. Double row angular contact bearings are preferred for applications requiring precise alignment and higher speeds, such as industrial machinery. Hub bearing units integrate the wheel hub with the bearing assembly, simplifying installation.

• Taper Roller Bearing: Fits ISO 355 standards, available in sizes from 40 to 210 mm.
• Double Row Angular Contact Ball Bearing: Commonly used for front-wheel drive applications, rated at speeds up to 8,000 rpm.
• Hub Bearing Unit: Integrated design simplifies assembly and maintenance.

Materials and specifications

Wheel Bearings are typically made from high-strength steel alloys like EN8 carbon steel or stainless steels such as A2-70. They adhere to international standards including ISO 355 for taper roller bearings, ensuring interchangeability and performance consistency across manufacturers. Load ratings range from 10 kN to over 100 kN depending on the bearing size and type.

ISO 355 sets out dimensional tolerances and material grades for taper roller bearings, guaranteeing reliable operation under various conditions. EN8 carbon steel is suitable for standard applications requiring moderate durability and wear resistance, while A2-70 stainless provides corrosion resistance in harsh environments.

Selection criteria

Selecting the right Wheel Bearing involves assessing load requirements, rotational speed, and environmental factors. For high-load applications like truck axles, taper roller bearings are ideal due to their strong design. Angular contact ball bearings excel at high speeds but require careful alignment to avoid premature wear. Hub bearing units offer convenience in fit-and-forget installations for automotive use.

Consider factors such as the operating temperature range (typically -40°C to 120°C) and lubrication needs when choosing a Wheel Bearing. Compatibility with existing systems, including mounting dimensions and shaft sizes, is important for smooth integration.

UK suppliers

MLC lists verified suppliers from Companies House that provide high-quality Wheel Bearings across various industries. Major trade bodies like the British Industrial Fasteners Association (BIAFD) and the British Lubricating Oil Distributors' Association (BTMA) ensure suppliers meet stringent quality standards. Suppliers are rigorously vetted to guarantee reliable products and services.

Common applications

Wheel Bearings find extensive use in automotive front and rear wheels, industrial machinery such as conveyor systems, and trailers. In vehicles, they support wheel hubs under constant stress from acceleration, braking, and cornering forces. Industrial trolleys rely on Wheel Bearings for smooth movement and durability in heavy-duty environments. For instance, a typical truck trailer axle uses taper roller bearings rated at 70 kN to handle the combined radial and axial loads during long hauls.

Maintenance engineers often replace worn-out Wheel Bearings to prevent catastrophic failures that can lead to costly downtime and repairs. Regular inspection and lubrication are important for extending bearing life in demanding applications.