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）
7302CMDB车削铜保持器 15 42 13 21.7 13.7 0.17 DB pairing (P0, P6, P5 levels)
7302AMDB车削铜保持器 15 42 13 21.8 14.2 0.168 DB pairing (P0, P6, P5 levels)
7302BMDB车削铜保持器 15 42 13 20.2 13.2 0.172 DB pairing (P0, P6, P5 levels)
7003AMDB车削铜保持器 17 35 10 10.4 7.65 0.08 DB pairing (P0, P6, P5 levels)
7003BMDB车削铜保持器 17 35 10 9.9 7.5 0.09 DB pairing (P0, P6, P5 levels)
7203AMDB车削铜保持器 17 40 12 17.6 12 0.134 DB pairing (P0, P6, P5 levels)
7203BMDB车削铜保持器 17 40 12 16.1 11 0.136 DB pairing (P0, P6, P5 levels)
7303CMDB车削铜保持器 17 47 14 25.7 16.8 0.24 DB pairing (P0, P6, P5 levels)
7303AMDB车削铜保持器 17 47 14 25.9 17.3 0.232 DB pairing (P0, P6, P5 levels)
7303BMDB车削铜保持器 17 47 14 24 16 0.236 DB pairing (P0, P6, P5 levels)
7004AMDB车削铜保持器 20 42 12 17.6 13.2 0.136 DB pairing (P0, P6, P5 levels)
7004BMDB车削铜保持器 20 42 12 15.2 11.1 0.158 DB pairing (P0, P6, P5 levels)
7204AMDB车削铜保持器 20 47 14 23.5 16.6 0.212 DB pairing (P0, P6, P5 levels)
7204BMDB车削铜保持器 20 47 14 21.6 15.3 0.218 DB pairing (P0, P6, P5 levels)
7304CMDB车削铜保持器 20 52 15 30.1 19.9 0.3 DB pairing (P0, P6, P5 levels)
7304AMDB车削铜保持器 20 52 15 30.5 20.8 0.292 DB pairing (P0, P6, P5 levels)
7304BMDB车削铜保持器 20 52 15 28.2 19.3 0.3 DB pairing (P0, P6, P5 levels)
7404AMDB车削铜保持器 20 72 19 57.8 38.2 0.79 DB pairing (P0, P6, P5 levels)
7404BMDB车削铜保持器 20 72 19 54.4 35.9 0.79 DB pairing (P0, P6, P5 levels)
7005AMDB车削铜保持器 25 47 12 18.3 14.8 0.158 DB pairing (P0, P6, P5 levels)