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）
7340BTNDB尼龙保持器 200 420 80 700 1200 110.6 DB pairing (P0, P6, P5 levels)
7844ATNDB尼龙保持器 220 270 24 138 270 5.68 DB pairing (P0, P6, P5 levels)
7844BTNDB尼龙保持器 220 270 24 122 241 5.64 DB pairing (P0, P6, P5 levels)
7944ATNDB尼龙保持器 220 300 38 279 465 15.2 DB pairing (P0, P6, P5 levels)
7944BTNDB尼龙保持器 220 300 38 248 415 15.18 DB pairing (P0, P6, P5 levels)
7044ATNDB尼龙保持器 220 340 56 460 785 37 DB pairing (P0, P6, P5 levels)
7044BTNDB尼龙保持器 220 340 56 410 710 36.8 DB pairing (P0, P6, P5 levels)
7244ATNDB尼龙保持器 220 400 65 665 1170 73 DB pairing (P0, P6, P5 levels)
7244BTNDB尼龙保持器 220 400 65 600 1060 72.2 DB pairing (P0, P6, P5 levels)
7344ATNDB尼龙保持器 220 460 88 805 1450 146.4 DB pairing (P0, P6, P5 levels)
7344BTNDB尼龙保持器 220 460 88 730 1330 145.8 DB pairing (P0, P6, P5 levels)
7848ATNDB尼龙保持器 240 300 28 179 350 8.7 DB pairing (P0, P6, P5 levels)
7848BTNDB尼龙保持器 240 300 28 159 315 8.7 DB pairing (P0, P6, P5 levels)
7948ATNDB尼龙保持器 240 320 38 293 520 16.74 DB pairing (P0, P6, P5 levels)
7948BTNDB尼龙保持器 240 320 38 261 465 16.86 DB pairing (P0, P6, P5 levels)
7048ATNDB尼龙保持器 240 360 56 485 865 38.6 DB pairing (P0, P6, P5 levels)
7048BTNDB尼龙保持器 240 360 56 435 780 39.8 DB pairing (P0, P6, P5 levels)
7248ATNDB尼龙保持器 240 440 72 705 1330 101.8 DB pairing (P0, P6, P5 levels)
7248BTNDB尼龙保持器 240 440 72 635 1200 100.6 DB pairing (P0, P6, P5 levels)
7348ATNDB尼龙保持器 240 500 95 920 1760 185 DB pairing (P0, P6, P5 levels)