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Double Direction Thrust Ball Bearings

Double direction thrust ball bearings are engineered to handle axial loads in both directions simultaneously.

These bearings are ideal for applications requiring high load capacity and stability, such as automotive transmissions and heavy machinery.

Their robust design ensures optimal performance, making them a reliable choice for demanding industrial environments.

Unique Bidirectional Load-Carrying Capacity

The structure of a double direction thrust ball bearing is unique, consisting of two opposing rows of balls. These rows share the same cage and bearing housing washer (also known as the seat washer).

This sandwich-like design is the key difference between double direction and single direction thrust ball bearings. Unlike the single direction type, the shaft washers and housing washers of a double direction thrust ball bearing each have their own raceways, allowing the bearing to support pure axial loads from both directions.

Therefore, if your main requirement is to handle axial forces coming from both directions, this type is your ideal choice.

The Ideal Choice for Pure Axial Loads

Unlike angular contact bearings, which are designed to handle combined loads, double direction thrust ball bearings are almost exclusively engineered to support axial loads.

Free from the influence of radial forces, they manage axial loads with high efficiency, ensuring smooth and precise machine performance. This makes them a popular choice in applications such as machine tool spindles, screw drive systems, and high-precision rotary mechanisms.

If your equipment demands accurate positioning without the need for high-speed operation, double direction thrust ball bearings are an excellent solution.

Minimum Load Requirements

To ensure proper operation, double direction thrust ball bearings—like ball and roller bearings—must be bear a minimum load, especially under high speeds, rapid acceleration, or rapid changes in load direction.

In such conditions, the inertia of the balls and cage, along with internal lubricant friction, can negatively affect bearing performance. This may result in harmful sliding between the balls and raceways.

When starting at low temperatures or using high-viscosity lubricants, a higher minimum load may be required. In most cases, the weight supported by the bearing and any external forces—particularly in vertical shaft applications—already exceed the minimum load requirement. If not, a preload should be applied, such as using a spring mechanism.

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FREQUENTLY ASKED QUESTIONS

Can I use double direction thrust ball bearings if my equipment needs to support very light radial loads?

No, double direction thrust ball bearings are designed exclusively for axial loads(thrust load). If subjected to radial loads, the bearing may be damaged. Even very light radial forces can negatively impact the bearing’s service life. Therefore, if both radial and axial loads are present, it's recommended to use a suitable type of angular contact bearing.

Are double direction thrust ball bearings suitable for high-speed operation?

No, they are not suitable for high-speed operation.

Due to the influence of centrifugal force, the rotational speed of thrust ball bearings is generally lower than that of radial bearings. Excessive speed can lead to slippage or increased wear. You can find detailed information about max speeds on the product detail pages of our catalog.