HK0808 Metric Drawn Cup Needle Roller Bearing Budget Brand

Inner Diameter / Bore – 8mm

Outer Diameter – 12mm

Width – 8mm

Needle Roller Bearings

Needle roller bearings are a specialist type of roller bearing designed to provide high radial load capacity within a compact and space-saving design. Instead of using conventional steel balls, needle roller bearings incorporate long, slender cylindrical rollers. These rollers have a much greater length-to-diameter ratio than standard cylindrical rollers, allowing the bearing to support significant loads while maintaining a relatively small cross-sectional area.

Needle roller bearings are widely used throughout engineering, manufacturing, automotive, agricultural and industrial machinery. Their combination of high load capacity, compact dimensions and reliable operation makes them an excellent choice where installation space is restricted or where a conventional ball bearing may not provide the required performance.

Compact Bearing Design

One of the principal advantages of a needle roller bearing is its compact construction. The diameter of the rollers is relatively small, allowing the overall bearing size to be reduced without sacrificing radial load-carrying ability. This makes needle roller bearings particularly useful for machinery where reducing the size or weight of a component is important.

The needle rollers provide a relatively large contact area with the raceways. This enables the bearing to distribute radial loads effectively and provides good load-carrying capacity in relation to its physical size.

Needle roller bearings are available in a variety of designs to suit different applications. These include drawn cup needle roller bearings, machined-ring needle roller bearings, needle roller assemblies and bearings incorporating an inner ring. Different designs can provide solutions for varying requirements concerning load, speed, lubrication and available installation space.

Drawn Cup Needle Roller Bearings

Drawn cup needle roller bearings are among the most commonly used types. They feature a thin-walled outer ring formed from high-strength steel, containing a set of precision needle rollers. The drawn cup construction provides a compact outside diameter and allows the bearing to be installed directly into a suitable housing.

Many drawn cup bearings are supplied with an open design, while sealed versions are also available for applications where protection against contamination or retention of lubricant is required.

Performance and Reliability

Correct specification and installation are important for achieving reliable performance from a needle roller bearing. The shaft, housing and bearing must be compatible in terms of dimensions, tolerances, hardness and surface finish.

In some applications, the shaft itself can act as the inner raceway, eliminating the need for a separate inner ring and allowing an even more compact bearing arrangement. Where this configuration is used, the shaft must have an appropriate hardened and accurately finished surface to withstand contact with the needle rollers.

Lubrication is also essential for reducing friction and wear. Depending on the operating conditions, needle roller bearings may be lubricated with grease or oil. The appropriate lubricant should be selected according to operating speed, load, temperature and environmental conditions.

Applications

Needle roller bearings are used across a wide range of mechanical and industrial equipment. Typical applications include automotive transmissions, gearboxes, pumps, electric motors, machine tools, printing machinery, textile equipment, agricultural machinery and industrial automation systems.

They are particularly suitable for rotating components, shafts, gears, pulleys and other mechanisms where radial loads need to be supported within a restricted space.

Selecting a Needle Roller Bearing

When choosing a needle roller bearing, several factors should be considered. These include bore diameter, outside diameter, bearing width, radial load, rotational speed and operating temperature. The available housing space and shaft dimensions should also be checked carefully.

For replacement applications, matching the original bearing designation and dimensions is usually the simplest way to identify a suitable replacement. However, it is important to verify the specification before ordering, particularly where the bearing forms part of critical machinery.

Needle Roller Bearings from Unicorn Industrial Products

Unicorn Industrial Products Ltd supplies a range of bearings and engineering components for industrial, maintenance and mechanical applications. Our needle roller bearings offer a practical solution where high radial load capacity and compact dimensions are required.

Whether you are replacing a bearing in existing machinery or specifying components for a new application, needle roller bearings provide an efficient and reliable bearing solution. If you are unsure which type or size of needle roller bearing you require, contact our sales team for assistance with bearing identification and selection.