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）
7416BTNDB尼龙保持器 80 200 48 290 307 12 DB pairing (P0, P6, P5 levels)
7917ACTNDB尼龙保持器 85 120 18 5.3 7.5 1.082 DB pairing (P0, P6, P5 levels)
7017ATNDB尼龙保持器 85 130 22 3.4 4.5 1.826 DB pairing (P0, P6, P5 levels)
7017BTNDB尼龙保持器 85 130 22 79.3 96.7 1.94 DB pairing (P0, P6, P5 levels)
7217ATNDB尼龙保持器 85 150 28 3 4.3 3.66 DB pairing (P0, P6, P5 levels)
7217BTNDB尼龙保持器 85 150 28 2.2 3 3.74 DB pairing (P0, P6, P5 levels)
7317CTNDB尼龙保持器 85 180 41 261 261 9.06 DB pairing (P0, P6, P5 levels)
7317ATNDB尼龙保持器 85 180 41 2.2 2.8 8.66 DB pairing (P0, P6, P5 levels)
7317BTNDB尼龙保持器 85 180 41 1.9 2.6 8.84 DB pairing (P0, P6, P5 levels)
7417ATNDB尼龙保持器 85 210 52 331 360 17.08 DB pairing (P0, P6, P5 levels)
7417BTNDB尼龙保持器 85 210 52 307 334 17.08 DB pairing (P0, P6, P5 levels)
7918ACTNDB尼龙保持器 90 125 18 5 7.1 1.12 DB pairing (P0, P6, P5 levels)
7018ATNDB尼龙保持器 90 140 24 3.2 4.3 2.38 DB pairing (P0, P6, P5 levels)
7018BTNDB尼龙保持器 90 140 24 95 114 2.52 DB pairing (P0, P6, P5 levels)
7218ATNDB尼龙保持器 90 160 30 2.8 4 4.5 DB pairing (P0, P6, P5 levels)
7218BTNDB尼龙保持器 90 160 30 2 2.8 4.58 DB pairing (P0, P6, P5 levels)
7318CTNDB尼龙保持器 90 190 43 281 289 10.6 DB pairing (P0, P6, P5 levels)
7318ATNDB尼龙保持器 90 190 43 2 2.8 10.12 DB pairing (P0, P6, P5 levels)
7318BTNDB尼龙保持器 90 190 43 1.8 2.4 10.34 DB pairing (P0, P6, P5 levels)
7418ATNDB尼龙保持器 90 225 54 351 393 22.8 DB pairing (P0, P6, P5 levels)