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Thrust Ball Bearings.jpg
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High Efficiency Thrust Ball Bearings Supplier - China Factory for Single and Double-Direction Bearings

Thrust ball bearings are essential components in many industrial applications, and they come in two primary types: single-direction thrust ball bearings and double-direction thrust ball bearings. As a leading manufacturer in China, our factory specializes in producing high-quality thrust ball bearings that meet the diverse needs of our customers. Partnering with reliable suppliers, we ensure that our products are built to last, providing excellent performance and durability. Choose our China-based factory for your thrust ball bearing needs and experience the difference in quality and service
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    Product Details

    Single-Direction Thrust Ball Bearings

    Tapered roller bearings are classified into three types:

    • Single-row
    • Double-row
    • Four-row

    The main parameters of tapered roller bearings have been optimized, increasing the number of rollers and their effective length. The meticulous design of the rollers and raceways significantly improves geometric contact, stress distribution, and lubricant film formation, enhancing roller motion conditions. Consequently, compared to earlier models of the same size, these bearings offer higher load capacity and extended rated service life.

    Double-row tapered roller bearings can withstand combined radial and axial loads (primarily radial) as well as bidirectional axial loads. A spacer is placed between the two inner rings, allowing clearance adjustment and uniform load distribution by varying the spacer thickness. These bearings are suitable for medium to low-speed applications.

    Double-Direction Thrust Ball Bearings

    Double-direction thrust ball bearings are separable bearings. They consist of:

    • One shaft washer with grooves on both sides
    • Two housing washers
    • Two ball and cage assemblies

    These bearings can accommodate bidirectional axial loads but cannot carry any radial load. They provide bidirectional axial positioning for the shaft.

    The housing washers and ball-and-cage assemblies are identical to those used in corresponding single-direction bearings.

    Dimensions

    The basic dimensions of thrust ball bearings listed in the tables comply with ISO 104.

    Tolerances

    Standard thrust ball bearings are manufactured to P0 tolerance grade. Upon request, bearings with higher precision grades such as P6, P5, or even P4 can be provided. Tolerance values for each grade can be referenced in the standards.

    Cages

    Thrust ball bearings use either stamped steel cages or machined brass cages. The cage material for specific specifications is provided in the table below.

    Minimum Load

    During operation, inertial forces may cause sliding between the balls and raceways, leading to increased temperature and damage to working surfaces. To prevent this, a minimum axial load Fa min must be applied:

    Fa min ≥ A × ( nmax / 1000 )²
    Where
    • Fa min: Minimum axial load (kN)
    • A: Minimum load coefficient (provided in bearing dimension tables)
    • nmax: Maximum operating speed (rpm)

    The weight of supported components combined with external forces often exceeds the minimum load. If not, preload must be applied (e.g., using springs).

    Static Equivalent Load

    For single- and double-direction thrust ball bearings:

    P0 = Fa

    Dynamic Equivalent Load

    For single- and double-direction thrust ball bearings:

    P = Fa

    Frequently Asked Questions

    Q What is the difference between single-direction and double-direction thrust ball bearings?
    Single-direction thrust ball bearings can only accommodate axial loads in one direction, while double-direction thrust ball bearings feature a shaft washer with grooves on both sides, allowing them to handle bidirectional axial loads and provide axial positioning in both directions.
    Q Can thrust ball bearings carry radial loads?
    No. Thrust ball bearings — both single- and double-direction types — are designed exclusively for axial loads. They cannot carry any radial load. If combined loading is required, a different bearing type such as a tapered roller bearing should be considered.
    Q What tolerance grades are available for thrust ball bearings?
    Standard thrust ball bearings are produced to P0 tolerance grade. Higher precision grades — P6, P5, and P4 — are available upon request for applications requiring tighter dimensional and running accuracy. Specific tolerance values for each grade are defined in the relevant standards.
    Q Why is a minimum axial load required during operation?
    At high speeds, inertial forces can cause the balls to slide against the raceways rather than roll, generating excessive heat and surface damage. Applying a minimum axial load (Fa min) ensures proper rolling contact is maintained. If the weight of supported components is insufficient, a preload — such as a spring — must be used.
    Q What cage materials are used in thrust ball bearings?
    Thrust ball bearings are available with either stamped steel cages or machined brass cages. The specific cage material used depends on the bearing size and specification, and is indicated in the bearing dimension tables.
    Q How are the dynamic and static equivalent loads calculated for thrust ball bearings?
    For both single- and double-direction thrust ball bearings, the calculation is straightforward: the static equivalent load P0 equals the applied axial load Fa, and the dynamic equivalent load P also equals Fa. This applies because these bearings are designed solely for pure axial loading with no radial component.