AXK0821TN SKF Thrust type Needle Roller Bearing 8mm X 21mm X 2mm

What is a Thrust type Needle Roller Bearing?

A thrust-type needle roller bearing is a type of bearing designed to handle high axial loads (thrust) while occupying minimal space. It uses thin, cylindrical needle rollers as the rolling elements, which are much longer than their diameter. This design allows for high load-carrying capacity while minimizing the bearing's overall thickness.

Key Features:

Axial Load Support: It supports loads parallel to the shaft (axial), as opposed to radial loads.

Needle Rollers: The needle rollers are the defining feature. Their small diameter provides a large contact area, spreading the load and allowing for higher load capacity in a smaller package compared to ball or roller bearings.

Compact Design: Thrust-type needle roller bearings are ideal when axial space is limited and a slim bearing is required.

High Load Capacity: Despite their compact size, they can handle heavy axial loads.

Applications: They are often used in automotive transmissions, pumps, and gearboxes where axial space is tight but high load capacities are required. Thrust needle roller bearings generally consist of a thrust cage assembly that holds the needle rollers in place and sometimes, thrust washers that support the rollers.

What are Thrust type Needle Roller Bearings used for?

Thrust-type needle roller bearings are used in applications that require the support of high axial loads (loads along the axis of rotation) within a compact space. These bearings are specifically designed for conditions where space is limited, and they offer a high load-carrying capacity relative to their size.

Common Applications:

Automotive Transmissions: These bearings are widely used in manual and automatic transmissions to manage axial loads on shafts and gears, ensuring smooth gear changes.

Pumps: In hydraulic pumps or water pumps, thrust needle roller bearings help manage axial forces generated by the pump’s impeller or shaft during operation.

Steering Systems: In automotive steering mechanisms, thrust needle roller bearings are used to support axial loads, providing precise control and smooth steering operation.

Machine Tools: In machining equipment, such as milling machines, lathes, or drilling machines, these bearings help reduce axial load friction, which is critical for high-precision and efficient operation.

Gearboxes: Gearboxes in industrial machinery often use thrust-type needle roller bearings to handle the heavy axial loads produced during gear engagement and transmission of torque.

Clutches: Automotive clutches and overrunning clutches use thrust needle roller bearings to handle high axial loads while keeping the overall component design compact.

Construction Equipment: In heavy-duty machinery, such as excavators or cranes, thrust-type needle roller bearings help manage axial loads in rotating parts like swing drives and winches.

Aircraft Components: These bearings are also used in various aviation applications, especially in compact systems requiring efficient load management and space-saving designs.

Their compact form factor and ability to handle significant axial loads make them indispensable in industries where both performance and space savings are critical.

What are the benefits to using a Thrust type Needle Roller Bearing?

Thrust-type needle roller bearings offer several advantages in specific applications, especially where compactness and high axial load capacity are essential. Here are the key benefits:


High Load-Carrying Capacity in Compact Space: Needle roller bearings use thin, long rollers, which allow them to carry heavy axial loads relative to their size. This makes them ideal for applications where space is limited but the load requirements are significant.

Space Efficiency: These bearings are designed with a low-profile, making them a compact solution for handling high axial forces. Their slim design helps reduce the overall size of the system, making them perfect for applications where space is a constraint.

Reduced Friction and Heat Generation: The needle rollers reduce friction between the moving parts, minimizing wear and tear. This leads to lower operating temperatures and improved efficiency in high-speed applications.

Durability and Longevity: Thrust-type needle roller bearings are constructed to handle high loads with minimal deformation. This increases their lifespan, even in demanding conditions, such as heavy machinery or automotive transmissions.

Cost-Effectiveness: Due to their simple design and minimal material use (compared to other types of bearings like ball bearings), needle roller bearings can be a cost-effective solution for high load applications.

Ability to Handle Axial Loads: Unlike many other bearing types that are better suited for radial loads, thrust needle roller bearings are designed specifically to handle axial loads (loads parallel to the shaft), making them ideal for gearboxes, clutches, and other applications where axial forces are present.

Ease of Assembly: Thrust needle roller bearings often come as pre-assembled units or can be easily integrated into systems, simplifying the installation process.

Wide Range of Applications: These bearings are versatile and used across various industries, from automotive and aerospace to heavy machinery, providing reliable axial load handling in both low- and high-speed applications.

Minimal Lubrication Needs: Due to their low friction characteristics, they typically require less lubrication compared to other bearing types, which reduces maintenance demands.


Overall, thrust-type needle roller bearings provide a great balance between performance, durability, and space efficiency, making them an excellent choice for applications where axial loads need to be managed efficiently.