DB pairing (P0, P6, P5 levels)

DB pairing is the most commonly used paired installation method for angular contact ball bearings, full name Double Back to Back, also known as back-to-back pairing, code named DB. The core is to install two angular contact ball bearings of the same specification with the outer ring wide edge facing each other and the inner ring narrow edge facing each other, forming an open layout facing both sides, suitable for radial+bidirectional axial load+overturning moment working conditions. It is the mainstream choice for shaft systems such as machine tool spindles, precision motors, reducers, etc. that require rigidity and rotational accuracy, and can also be adapted to angular contact ball bearings such as AC7000 and 7000 series.

Model Basic Dimensions Basic rated dynamic load WeightType
Inner diameter Outer diameter Thickness Dynamic load Static load
[mm] [mm] [mm] (kN) (kN) （kg）
7309AMDB车削铜保持器 45 100 25 103 87 1.696 DB pairing (P0, P6, P5 levels)
7309BMDB车削铜保持器 45 100 25 95 80.5 1.738 DB pairing (P0, P6, P5 levels)
7409AMDB车削铜保持器 45 120 29 138 108 3.1 DB pairing (P0, P6, P5 levels)
7409BMDB车削铜保持器 45 120 29 128 100 3.1 DB pairing (P0, P6, P5 levels)
7010AMDB车削铜保持器 50 80 16 40 42 0.526 DB pairing (P0, P6, P5 levels)
7010BMDB车削铜保持器 50 80 16 34.5 36.2 0.58 DB pairing (P0, P6, P5 levels)
7210AMDB车削铜保持器 50 90 20 67 63 0.932 DB pairing (P0, P6, P5 levels)
7210BMDB车削铜保持器 50 90 20 60.5 57 0.954 DB pairing (P0, P6, P5 levels)
7310CMDB车削铜保持器 50 110 27 122 103 2.28 DB pairing (P0, P6, P5 levels)
7310AMDB车削铜保持器 50 110 27 121 104 2.2 DB pairing (P0, P6, P5 levels)
7310BMDB车削铜保持器 50 110 27 111 96 2.24 DB pairing (P0, P6, P5 levels)
7410AMDB车削铜保持器 50 130 31 158 131 3.84 DB pairing (P0, P6, P5 levels)
7410BMDB车削铜保持器 50 130 31 147 121 3.84 DB pairing (P0, P6, P5 levels)
7011AMDB车削铜保持器 55 90 18 52.5 55.5 0.782 DB pairing (P0, P6, P5 levels)
7011BMDB车削铜保持器 55 90 18 45.4 47.5 0.84 DB pairing (P0, P6, P5 levels)
7211AMDB车削铜保持器 55 100 21 83 79 1.226 DB pairing (P0, P6, P5 levels)
7211BMDB车削铜保持器 55 100 21 75 72 1.254 DB pairing (P0, P6, P5 levels)
7311CMDB车削铜保持器 55 120 29 141 121 2.9 DB pairing (P0, P6, P5 levels)
7311AMDB车削铜保持器 55 120 29 139 123 2.82 DB pairing (P0, P6, P5 levels)
7311BMDB车削铜保持器 55 120 29 128 113 2.9 DB pairing (P0, P6, P5 levels)