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）
7318CMDB车削铜保持器 90 190 43 281 289 10.6 DB pairing (P0, P6, P5 levels)
7318AMDB车削铜保持器 90 190 43 2 2.8 10.12 DB pairing (P0, P6, P5 levels)
7318BMDB车削铜保持器 90 190 43 1.8 2.4 10.34 DB pairing (P0, P6, P5 levels)
7418AMDB车削铜保持器 90 225 54 351 393 22.8 DB pairing (P0, P6, P5 levels)
7418BMDB车削铜保持器 90 225 54 325 364 22.8 DB pairing (P0, P6, P5 levels)
7019AMDB车削铜保持器 95 145 24 3.8 5 2.86 DB pairing (P0, P6, P5 levels)
7019BMDB车削铜保持器 95 145 24 97 121 2.64 DB pairing (P0, P6, P5 levels)
7219AMDB车削铜保持器 95 170 32 2.6 3.6 5.36 DB pairing (P0, P6, P5 levels)
7219BMDB车削铜保持器 95 170 32 1.9 2.6 5.48 DB pairing (P0, P6, P5 levels)
7319CMDB车削铜保持器 95 200 45 300 319 12.24 DB pairing (P0, P6, P5 levels)
7319AMDB车削铜保持器 95 200 45 1.9 2.6 11.66 DB pairing (P0, P6, P5 levels)
7319BMDB车削铜保持器 95 200 45 1.7 2.4 11.96 DB pairing (P0, P6, P5 levels)
7820AMDB车削铜保持器 100 125 13 34 50.5 0.72 DB pairing (P0, P6, P5 levels)
7920AMDB车削铜保持器 100 140 20 78 105 1.86 DB pairing (P0, P6, P5 levels)
7020AMDB车削铜保持器 100 150 24 3.6 5 2.96 DB pairing (P0, P6, P5 levels)
7020BMDB车削铜保持器 100 150 24 99.5 127 2.74 DB pairing (P0, P6, P5 levels)
7220AMDB车削铜保持器 100 180 34 233 251 6.44 DB pairing (P0, P6, P5 levels)
7220BMDB车削铜保持器 100 180 34 212 229 6.56 DB pairing (P0, P6, P5 levels)
7320CMDB车削铜保持器 100 215 47 320 346 15.06 DB pairing (P0, P6, P5 levels)
7320AMDB车削铜保持器 100 215 47 335 385 14.58 DB pairing (P0, P6, P5 levels)