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）
7207BMDB车削铜保持器 35 72 17 44 36.5 0.588 DB pairing (P0, P6, P5 levels)
7307CMDB车削铜保持器 35 80 21 61.6 47.2 0.95 DB pairing (P0, P6, P5 levels)
7307AMDB车削铜保持器 35 80 21 65 52.5 0.928 DB pairing (P0, P6, P5 levels)
7307BMDB车削铜保持器 35 80 21 59.5 48.5 0.948 DB pairing (P0, P6, P5 levels)
7407AMDB车削铜保持器 35 100 25 98.2 73.9 1.9 DB pairing (P0, P6, P5 levels)
7407BMDB车削铜保持器 35 100 25 91.3 68.6 1.9 DB pairing (P0, P6, P5 levels)
7008AMDB车削铜保持器 40 68 15 31.5 31 0.38 DB pairing (P0, P6, P5 levels)
7008BMDB车削铜保持器 40 68 15 27.4 26.4 0.42 DB pairing (P0, P6, P5 levels)
7208AMDB车削铜保持器 40 80 18 57.5 50.5 0.75 DB pairing (P0, P6, P5 levels)
7208BMDB车削铜保持器 40 80 18 52 46 0.766 DB pairing (P0, P6, P5 levels)
7308CMDB车削铜保持器 40 90 23 75.3 58.8 1.314 DB pairing (P0, P6, P5 levels)
7308AMDB车削铜保持器 40 90 23 79.5 66 1.266 DB pairing (P0, P6, P5 levels)
7308BMDB车削铜保持器 40 90 23 73 60.5 1.296 DB pairing (P0, P6, P5 levels)
7408AMDB车削铜保持器 40 110 27 114 87.1 2.46 DB pairing (P0, P6, P5 levels)
7408BMDB车削铜保持器 40 110 27 105 80.8 2.46 DB pairing (P0, P6, P5 levels)
7009AMDB车削铜保持器 45 75 16 37.5 37.5 0.5 DB pairing (P0, P6, P5 levels)
7009BMDB车削铜保持器 45 75 16 32.5 32 0.52 DB pairing (P0, P6, P5 levels)
7209AMDB车削铜保持器 45 85 19 64.5 57.5 0.822 DB pairing (P0, P6, P5 levels)
7209BMDB车削铜保持器 45 85 19 58.5 52.5 0.842 DB pairing (P0, P6, P5 levels)
7309CMDB车削铜保持器 45 100 25 96.1 79.5 1.75 DB pairing (P0, P6, P5 levels)