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）
7211BTNDB尼龙保持器 55 100 21 75 72 1.254 DB pairing (P0, P6, P5 levels)
7311CTNDB尼龙保持器 55 120 29 141 121 2.9 DB pairing (P0, P6, P5 levels)
7311ATNDB尼龙保持器 55 120 29 139 123 2.82 DB pairing (P0, P6, P5 levels)
7311BTNDB尼龙保持器 55 120 29 128 113 2.9 DB pairing (P0, P6, P5 levels)
7411ATNDB尼龙保持器 55 140 33 192 165 4.72 DB pairing (P0, P6, P5 levels)
7411BTNDB尼龙保持器 55 140 33 179 153 4.72 DB pairing (P0, P6, P5 levels)
7812BTNDB尼龙保持器 60 78 10 24.4 25.8 0.14 DB pairing (P0, P6, P5 levels)
7912ACTNDB尼龙保持器 60 85 13 29.8 35.5 0.394 DB pairing (P0, P6, P5 levels)
7012ATNDB尼龙保持器 60 95 18 53.5 59 0.834 DB pairing (P0, P6, P5 levels)
7012BTNDB尼龙保持器 60 95 18 46.4 50.7 0.9 DB pairing (P0, P6, P5 levels)
7212ATNDB尼龙保持器 60 110 22 100 97.5 1.596 DB pairing (P0, P6, P5 levels)
7212BTNDB尼龙保持器 60 110 22 91 89 1.63 DB pairing (P0, P6, P5 levels)
7312CTNDB尼龙保持器 60 130 31 161 141 3.62 DB pairing (P0, P6, P5 levels)
7312ATNDB尼龙保持器 60 130 31 159 143 3.48 DB pairing (P0, P6, P5 levels)
7312BTNDB尼龙保持器 60 130 31 146 131 3.56 DB pairing (P0, P6, P5 levels)
7412ATNDB尼龙保持器 60 150 35 209 187 5.7 DB pairing (P0, P6, P5 levels)
7412BTNDB尼龙保持器 60 150 35 194 173 5.7 DB pairing (P0, P6, P5 levels)
7813BTNDB尼龙保持器 65 85 10 30.6 32 0.17 DB pairing (P0, P6, P5 levels)
7913ACTNDB尼龙保持器 65 90 13 31 39 0.422 DB pairing (P0, P6, P5 levels)
7013ATNDB尼龙保持器 65 100 18 56.5 65.5 0.91 DB pairing (P0, P6, P5 levels)