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）
7844BMDB车削铜保持器 220 270 24 122 241 5.64 DB pairing (P0, P6, P5 levels)
7944AMDB车削铜保持器 220 300 38 279 465 15.2 DB pairing (P0, P6, P5 levels)
7944BMDB车削铜保持器 220 300 38 248 415 15.18 DB pairing (P0, P6, P5 levels)
BT220-6BDB车削铜保持器 220 300 38 243 380 14.5 DB pairing (P0, P6, P5 levels)
BT220-2BDB车削铜保持器 220 309.5 38 310 490 17.8 DB pairing (P0, P6, P5 levels)
7044AMDB车削铜保持器 220 340 56 460 785 37 DB pairing (P0, P6, P5 levels)
7044BMDB车削铜保持器 220 340 56 410 710 36.8 DB pairing (P0, P6, P5 levels)
7244AMDB车削铜保持器 220 400 65 665 1170 73 DB pairing (P0, P6, P5 levels)
7244BMDB车削铜保持器 220 400 65 600 1060 72.2 DB pairing (P0, P6, P5 levels)
7344AMDB车削铜保持器 220 460 88 805 1450 146.4 DB pairing (P0, P6, P5 levels)
7344BMDB车削铜保持器 220 460 88 730 1330 145.8 DB pairing (P0, P6, P5 levels)
BT230-5BDB车削铜保持器 230 329.5 40 251 405 22 DB pairing (P0, P6, P5 levels)
7848AMDB车削铜保持器 240 300 28 179 350 8.7 DB pairing (P0, P6, P5 levels)
7848BMDB车削铜保持器 240 300 28 159 315 8.7 DB pairing (P0, P6, P5 levels)
7948AMDB车削铜保持器 240 320 38 293 520 16.74 DB pairing (P0, P6, P5 levels)
7948BMDB车削铜保持器 240 320 38 261 465 16.86 DB pairing (P0, P6, P5 levels)
BT240BDB车削铜保持器 240 329.5 40 320 530 20.2 DB pairing (P0, P6, P5 levels)
BT240-2BDB车削铜保持器 240 329.5 40 320 530 20.2 DB pairing (P0, P6, P5 levels)
BA240-1ADB车削铜保持器 240 340 40 345 575 23 DB pairing (P0, P6, P5 levels)
7048AMDB车削铜保持器 240 360 56 485 865 38.6 DB pairing (P0, P6, P5 levels)