Agular contact ball bearing contact Angle

        A fundamental part of the angular contact bearings is the contact angle. These bearings can only take axial load in one direction unless they are used in sets (see universal sets).

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Popular Contact Angles:

Standard Precision 15°

                                25°


High-Speed            18°

                                25°


Thrust                      30°

                                40°


Ball Screw Support  60°

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As the contact angle increases, the axial load capacity increases but the speed and life decrease. Angular contact bearings with small contact angles are more suitable for high-speeds and radial loads.


Effect of Contact Angle – Standard Designations

For high-speed products; 18° has been adopted as the lowest standard contact angle. This has been shown to be more effective at high-speeds in terms of bending stiffness compared to 15°. An 18° contact angle provides better axial stiffness than 15°, but less radial stiffness. However, as seen from the spindle diagram, bending stiffness is more important.

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For high-speed applications using motorised spindles, the internal heat generation can be much higher than belt driven spindles; this can reduce the bearing internal clearance and sometimes cause failure at high-speed. For these applications it is more beneficial to select a 25° contact angle because this has a greater radial internal clearance compared to the 18° contact angle and can more easily accommodate a reduction in internal clearance due to thermal movement.


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Examples of Contact Angle – High-Speed and Thrust Designations

25BGR10STDUELP2 = 15° Robust High-Speed Grinding Applications

30BNR10STDBELP = 18° Robust High-Speed

30BER10STDBELP3 = 25° Robust High-Speed

30BAR10STYNDBELP3 = 30° Robust Thrust

30BTR10STYNDBELP3 = 40° Robust Thrust

30TAC62BDFC9PN7A = 60° Ball Screw Support


2020-06-16