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Angular Contact Ball Bearings

Angular contact ball bearings are ball bearings in which the line connecting the contact points between the balls and the inner and outer raceways is inclined at a contact angle to the radial direction, allowing them to carry radial and axial loads simultaneously. Single-row types can only support axial load in one direction, so they are normally used as two or more units in back-to-back (DB), face-to-face (DF), or tandem (DT) arrangements, or as double-row types. Applying preload (an internal load applied in advance) to these combinations increases rigidity and rotational accuracy, so they are used to support machine tool spindles, ball screw supports, and shafts in pumps and compressors that are high-speed, high-precision, and subject to axial load.

How to choose Angular Contact Ball Bearings

  1. 1. Determine Axial Load Capacity by Contact Angle

    A larger contact angle increases axial load capacity and axial rigidity, while a smaller contact angle is better suited to high-speed rotation. Listed products have contact angles of 15° to 60°, with 15°, 30°, and 40° being common. Large contact angles are used for ball screw support applications. Select based on the load ratio and rotational speed.

  2. 2. Select a Combination Configuration Suited to the Load Direction

    DB arrangements withstand moment loads well and easily increase shaft rigidity, while DF arrangements readily tolerate tilt caused by mounting errors. DT arrangements share large one-directional axial loads across multiple rows. If axial loads act in both directions, DB or DF arrangements or double-row types are required.

  3. 3. Check Main Dimensions Matching the Shaft and Housing

    Match the bore to the shaft diameter and the outside diameter to the housing bore diameter. Listed products have bore diameters of 30 to 670 mm and outside diameters of 55 to 900 mm. Confirm that the width, including the total width of combined units, fits the available axial space.

  4. 4. Verify Life Using Basic Dynamic Load Rating

    The basic dynamic load rating Cr is the reference value for rated life calculations, and listed products range from 18.9 to 191 kN. Calculate the dynamic equivalent load from radial and axial loads and confirm that the required life is met. If impact or large loads during stops are present, also check the basic static load rating.

  5. 5. Permissible Rotational Speed by Lubrication Method

    The permissible rotational speed differs between grease lubrication and oil lubrication, with oil lubrication set higher. Larger combinations or preloads increase heat generation and reduce practical speed, so confirm that there is sufficient margin in the operating speed together with the lubrication method.

  6. 6. Precision Class and Cage Selection by Application

    General industrial machinery uses JIS Class 0, while locations requiring rotational accuracy, such as machine tool spindles, use high-precision grades such as Class 5 or Class 4. Cages are available in steel plate, resin, and machined brass types; confirm the material against the required high-speed capability, heat resistance, and lubrication conditions.

This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.