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）
7308AWDB冲压钢保持器 40 90 23 79.5 66 1.266 DB pairing (P0, P6, P5 levels)
7308BWDB冲压钢保持器 40 90 23 73 60.5 1.296 DB pairing (P0, P6, P5 levels)
7408AWDB冲压钢保持器 40 110 27 114 87.1 2.46 DB pairing (P0, P6, P5 levels)
7408BWDB冲压钢保持器 40 110 27 105 80.8 2.46 DB pairing (P0, P6, P5 levels)
7009AWDB冲压钢保持器 45 75 16 37.5 37.5 0.5 DB pairing (P0, P6, P5 levels)
7009BWDB冲压钢保持器 45 75 16 32.5 32 0.52 DB pairing (P0, P6, P5 levels)
7209AWDB冲压钢保持器 45 85 19 64.5 57.5 0.822 DB pairing (P0, P6, P5 levels)
7209BWDB冲压钢保持器 45 85 19 58.5 52.5 0.842 DB pairing (P0, P6, P5 levels)
7309AWDB冲压钢保持器 45 100 25 103 87 1.696 DB pairing (P0, P6, P5 levels)
7309BWDB冲压钢保持器 45 100 25 95 80.5 1.738 DB pairing (P0, P6, P5 levels)
7409AWDB冲压钢保持器 45 120 29 138 108 3.1 DB pairing (P0, P6, P5 levels)
7409BWDB冲压钢保持器 45 120 29 128 100 3.1 DB pairing (P0, P6, P5 levels)
7010AWDB冲压钢保持器 50 80 16 40 42 0.526 DB pairing (P0, P6, P5 levels)
7010BWDB冲压钢保持器 50 80 16 34.5 36.2 0.58 DB pairing (P0, P6, P5 levels)
7210AWDB冲压钢保持器 50 90 20 67 63 0.932 DB pairing (P0, P6, P5 levels)
7210BWDB冲压钢保持器 50 90 20 60.5 57 0.954 DB pairing (P0, P6, P5 levels)
7310AWDB冲压钢保持器 50 110 27 121 104 2.2 DB pairing (P0, P6, P5 levels)
7310BWDB冲压钢保持器 50 110 27 111 96 2.24 DB pairing (P0, P6, P5 levels)
7410AWDB冲压钢保持器 50 130 31 158 131 3.84 DB pairing (P0, P6, P5 levels)
7410BWDB冲压钢保持器 50 130 31 147 121 3.84 DB pairing (P0, P6, P5 levels)