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）
7407ATNDB尼龙保持器 35 100 25 98.2 73.9 1.9 DB pairing (P0, P6, P5 levels)
7407BTNDB尼龙保持器 35 100 25 91.3 68.6 1.9 DB pairing (P0, P6, P5 levels)
7808BTNDB尼龙保持器 40 52 7 12.6 11.7 0.058 DB pairing (P0, P6, P5 levels)
7908ACTNDB尼龙保持器 40 62 12 23.3 22.3 0.22 DB pairing (P0, P6, P5 levels)
7008ATNDB尼龙保持器 40 68 15 31.5 31 0.38 DB pairing (P0, P6, P5 levels)
7008BTNDB尼龙保持器 40 68 15 27.4 26.4 0.42 DB pairing (P0, P6, P5 levels)
7208ATNDB尼龙保持器 40 80 18 57.5 50.5 0.75 DB pairing (P0, P6, P5 levels)
7208BTNDB尼龙保持器 40 80 18 52 46 0.766 DB pairing (P0, P6, P5 levels)
7308CTNDB尼龙保持器 40 90 23 75.3 58.8 1.314 DB pairing (P0, P6, P5 levels)
7308ATNDB尼龙保持器 40 90 23 79.5 66 1.266 DB pairing (P0, P6, P5 levels)
7308BTNDB尼龙保持器 40 90 23 73 60.5 1.296 DB pairing (P0, P6, P5 levels)
7408ATNDB尼龙保持器 40 110 27 114 87.1 2.46 DB pairing (P0, P6, P5 levels)
7408BTNDB尼龙保持器 40 110 27 105 80.8 2.46 DB pairing (P0, P6, P5 levels)
7809BTNDB尼龙保持器 45 58 7 13.1 13.1 0.066 DB pairing (P0, P6, P5 levels)
7909ACTNDB尼龙保持器 45 68 12 24.6 25.4 0.26 DB pairing (P0, P6, P5 levels)
7009ATNDB尼龙保持器 45 75 16 37.5 37.5 0.5 DB pairing (P0, P6, P5 levels)
7009BTNDB尼龙保持器 45 75 16 32.5 32 0.52 DB pairing (P0, P6, P5 levels)
7209ATNDB尼龙保持器 45 85 19 64.5 57.5 0.822 DB pairing (P0, P6, P5 levels)
7209BTNDB尼龙保持器 45 85 19 58.5 52.5 0.842 DB pairing (P0, P6, P5 levels)
7309CTNDB尼龙保持器 45 100 25 96.1 79.5 1.75 DB pairing (P0, P6, P5 levels)