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）
7821BTNDB尼龙保持器 105 130 13 49.4 60 0.74 DB pairing (P0, P6, P5 levels)
7921ACTNDB尼龙保持器 105 145 20 78.5 108 1.64 DB pairing (P0, P6, P5 levels)
7921ATNDB尼龙保持器 105 145 20 79 109 1.94 DB pairing (P0, P6, P5 levels)
7021ATNDB尼龙保持器 105 160 26 130 163 3.68 DB pairing (P0, P6, P5 levels)
7021BTNDB尼龙保持器 105 160 26 116 147 3.46 DB pairing (P0, P6, P5 levels)
7221ATNDB尼龙保持器 105 190 36 254 283 7.68 DB pairing (P0, P6, P5 levels)
7221BTNDB尼龙保持器 105 190 36 231 258 7.84 DB pairing (P0, P6, P5 levels)
7321CTNDB尼龙保持器 105 225 49 362 413 17.24 DB pairing (P0, P6, P5 levels)
7321ATNDB尼龙保持器 105 225 49 335 385 18.68 DB pairing (P0, P6, P5 levels)
7321BTNDB尼龙保持器 105 225 49 310 355 18.86 DB pairing (P0, P6, P5 levels)
7822ATNDB尼龙保持器 110 140 16 50.5 76 1.16 DB pairing (P0, P6, P5 levels)
7922ACTNDB尼龙保持器 110 150 20 79.5 112 1.754 DB pairing (P0, P6, P5 levels)
7922ATNDB尼龙保持器 110 150 20 80 112 2.02 DB pairing (P0, P6, P5 levels)
7022ATNDB尼龙保持器 110 170 28 157 191 4.56 DB pairing (P0, P6, P5 levels)
7022BTNDB尼龙保持器 110 170 28 141 172 4.28 DB pairing (P0, P6, P5 levels)
7222ATNDB尼龙保持器 110 200 38 276 315 8.98 DB pairing (P0, P6, P5 levels)
7222BTNDB尼龙保持器 110 200 38 250 289 9.16 DB pairing (P0, P6, P5 levels)
7322CTNDB尼龙保持器 110 240 50 404 484 20.2 DB pairing (P0, P6, P5 levels)
7322ATNDB尼龙保持器 110 240 50 360 430 22.2 DB pairing (P0, P6, P5 levels)
7322BTNDB尼龙保持器 110 240 50 325 395 22.4 DB pairing (P0, P6, P5 levels)