Single-row angular contact ball bearings: 718, 719, 70, 72 series bearings

Angular contact ball bearings have a high limit speed and can bear radial loads and axial loads at the same time, or pure axial loads. Their axial load capacity is determined by the contact angle and increases with the increase of the contact angle.

Single-row angular contact ball bearings can bear radial loads and axial loads in one direction at the same time, or pure axial loads in a single direction. When bearing radial loads, axial force components will be caused. Therefore, single-row angular contact ball bearings often need to be matched and installed with other bearings that bear axial loads in the opposite direction. In other words, angular contact ball bearings are usually used in duplex, triplex, quadruple or even quintuple combinations. Angular contact ball bearings have a high limit speed. Precision angular contact ball bearings for spindles are available in four sizes: 718, 719, 70 and 72. Bearings with the same inner diameter have their outer diameters and widths increasing in sequence. The contact angles of precision angular contact ball bearings are 15° (code C) and 25° (code AC). For angular contact ball bearings, the larger the contact angle, the greater the axial load capacity, but the lower the bearing's limit speed. Therefore, the main shaft support with high speed and small axial load should use a bearing with a contact angle of 15°, otherwise, an angular contact ball bearing with a contact angle of 25° should be used.