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）
7828ATNDB尼龙保持器 140 175 18 77 130 1.9 DB pairing (P0, P6, P5 levels)
7828BTNDB尼龙保持器 140 175 18 68 116 1.9 DB pairing (P0, P6, P5 levels)
7928ACTNDB尼龙保持器 140 190 24 122 180 3.26 DB pairing (P0, P6, P5 levels)
7928ATNDB尼龙保持器 140 190 24 117 173 3.84 DB pairing (P0, P6, P5 levels)
7928BTNDB尼龙保持器 140 190 24 104 155 3.9 DB pairing (P0, P6, P5 levels)
7028ATNDB尼龙保持器 140 210 33 194 265 7.8 DB pairing (P0, P6, P5 levels)
7028BTNDB尼龙保持器 140 210 33 174 239 7.28 DB pairing (P0, P6, P5 levels)
7228ATNDB尼龙保持器 140 250 42 355 470 17.84 DB pairing (P0, P6, P5 levels)
7228BTNDB尼龙保持器 140 250 42 320 425 17.88 DB pairing (P0, P6, P5 levels)
7328CTNDB尼龙保持器 140 300 62 573 802 37.6 DB pairing (P0, P6, P5 levels)
7328ATNDB尼龙保持器 140 300 62 490 670 42.8 DB pairing (P0, P6, P5 levels)
7328BTNDB尼龙保持器 140 300 62 445 615 43.2 DB pairing (P0, P6, P5 levels)
7830ATNDB尼龙保持器 150 190 20 87 149 2.64 DB pairing (P0, P6, P5 levels)
7830BTNDB尼龙保持器 150 190 20 77 133 2.6 DB pairing (P0, P6, P5 levels)
7930ACTNDB尼龙保持器 150 210 28 157 231 5.94 DB pairing (P0, P6, P5 levels)
7930ATNDB尼龙保持器 150 210 28 150 222 5.98 DB pairing (P0, P6, P5 levels)
7930BTNDB尼龙保持器 150 210 28 134 199 5.9 DB pairing (P0, P6, P5 levels)
7030ATNDB尼龙保持器 150 225 35 222 305 9.5 DB pairing (P0, P6, P5 levels)
7030BTNDB尼龙保持器 150 225 35 199 277 8.86 DB pairing (P0, P6, P5 levels)
7230ATNDB尼龙保持器 150 270 45 405 560 22.4 DB pairing (P0, P6, P5 levels)