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）
7072AMDB车削铜保持器 360 540 82 865 1920 124.8 DB pairing (P0, P6, P5 levels)
7072BMDB车削铜保持器 360 540 82 775 1730 127.2 DB pairing (P0, P6, P5 levels)
7272AMDB车削铜保持器 360 650 95 1090 2550 288 DB pairing (P0, P6, P5 levels)
7272BMDB车削铜保持器 360 650 95 975 2310 280 DB pairing (P0, P6, P5 levels)
7876AMDB车削铜保持器 380 480 46 455 955 39 DB pairing (P0, P6, P5 levels)
BT380-3BDB车削铜保持器 380 519.5 65 565 1220 82.6 DB pairing (P0, P6, P5 levels)
7976AMDB车削铜保持器 380 520 65 635 1450 79.6 DB pairing (P0, P6, P5 levels)
7976BMDB车削铜保持器 380 520 65 565 1300 81.4 DB pairing (P0, P6, P5 levels)
7076AMDB车削铜保持器 380 560 82 800 1750 135.8 DB pairing (P0, P6, P5 levels)
7076BMDB车削铜保持器 380 560 82 720 1580 133.4 DB pairing (P0, P6, P5 levels)
BA381-1ADB车削铜保持器 381 540 82 680 1500 228 DB pairing (P0, P6, P5 levels)
7880AMDB车削铜保持器 400 500 46 465 1000 40.8 DB pairing (P0, P6, P5 levels)
7980AMDB车削铜保持器 400 540 65 640 1500 84.2 DB pairing (P0, P6, P5 levels)
7980BMDB车削铜保持器 400 540 65 570 1350 84.6 DB pairing (P0, P6, P5 levels)
7080AMDB车削铜保持器 400 600 90 905 2030 171.8 DB pairing (P0, P6, P5 levels)
7080BMDB车削铜保持器 400 600 90 810 1830 172.4 DB pairing (P0, P6, P5 levels)
7884AMDB车削铜保持器 420 520 46 505 1110 42.2 DB pairing (P0, P6, P5 levels)
BA420-1ADB车削铜保持器 420 560 53 605 1470 72.4 DB pairing (P0, P6, P5 levels)
7984AMDB车削铜保持器 420 560 65 665 1610 88 DB pairing (P0, P6, P5 levels)
7984BMDB车削铜保持器 420 560 65 590 1440 88.8 DB pairing (P0, P6, P5 levels)