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）
7226BMDB车削铜保持器 130 230 40 278 350 14.2 DB pairing (P0, P6, P5 levels)
BT130-1BDB车削铜保持器 130 250 45 340 435 19.96 DB pairing (P0, P6, P5 levels)
7326CMDB车削铜保持器 130 280 58 478 629 30.8 DB pairing (P0, P6, P5 levels)
7326AMDB车削铜保持器 130 280 58 445 585 35 DB pairing (P0, P6, P5 levels)
7326BMDB车削铜保持器 130 280 58 405 535 35.2 DB pairing (P0, P6, P5 levels)
7828AMDB车削铜保持器 140 175 18 77 130 1.9 DB pairing (P0, P6, P5 levels)
7828BMDB车削铜保持器 140 175 18 68 116 1.9 DB pairing (P0, P6, P5 levels)
7928ACMDB车削铜保持器 140 190 24 122 180 3.26 DB pairing (P0, P6, P5 levels)
7928AMDB车削铜保持器 140 190 24 117 173 3.84 DB pairing (P0, P6, P5 levels)
7928BMDB车削铜保持器 140 190 24 104 155 3.9 DB pairing (P0, P6, P5 levels)
7028AMDB车削铜保持器 140 210 33 194 265 7.8 DB pairing (P0, P6, P5 levels)
7028BMDB车削铜保持器 140 210 33 174 239 7.28 DB pairing (P0, P6, P5 levels)
7228AMDB车削铜保持器 140 250 42 355 470 17.84 DB pairing (P0, P6, P5 levels)
7228BMDB车削铜保持器 140 250 42 320 425 17.88 DB pairing (P0, P6, P5 levels)
7328CMDB车削铜保持器 140 300 62 573 802 37.6 DB pairing (P0, P6, P5 levels)
7328AMDB车削铜保持器 140 300 62 490 670 42.8 DB pairing (P0, P6, P5 levels)
7328BMDB车削铜保持器 140 300 62 445 615 43.2 DB pairing (P0, P6, P5 levels)
BA145-1ADB车削铜保持器 145 220 38 241 315 10.3 DB pairing (P0, P6, P5 levels)
7830AMDB车削铜保持器 150 190 20 87 149 2.64 DB pairing (P0, P6, P5 levels)
7830BMDB车削铜保持器 150 190 20 77 133 2.6 DB pairing (P0, P6, P5 levels)