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）
7309ATNDB尼龙保持器 45 100 25 103 87 1.696 DB pairing (P0, P6, P5 levels)
7309BTNDB尼龙保持器 45 100 25 95 80.5 1.738 DB pairing (P0, P6, P5 levels)
7409ATNDB尼龙保持器 45 120 29 138 108 3.1 DB pairing (P0, P6, P5 levels)
7409BTNDB尼龙保持器 45 120 29 128 100 3.1 DB pairing (P0, P6, P5 levels)
7810BTNDB尼龙保持器 50 65 7 13.9 14.7 0.086 DB pairing (P0, P6, P5 levels)
7910ACTNDB尼龙保持器 50 72 12 25.9 28.4 0.264 DB pairing (P0, P6, P5 levels)
7010ATNDB尼龙保持器 50 80 16 40 42 0.526 DB pairing (P0, P6, P5 levels)
7010BTNDB尼龙保持器 50 80 16 34.5 36.2 0.58 DB pairing (P0, P6, P5 levels)
7210ATNDB尼龙保持器 50 90 20 67 63 0.932 DB pairing (P0, P6, P5 levels)
7210BTNDB尼龙保持器 50 90 20 60.5 57 0.954 DB pairing (P0, P6, P5 levels)
7310CTNDB尼龙保持器 50 110 27 122 103 2.28 DB pairing (P0, P6, P5 levels)
7310ATNDB尼龙保持器 50 110 27 121 104 2.2 DB pairing (P0, P6, P5 levels)
7310BTNDB尼龙保持器 50 110 27 111 96 2.24 DB pairing (P0, P6, P5 levels)
7410ATNDB尼龙保持器 50 130 31 158 131 3.84 DB pairing (P0, P6, P5 levels)
7410BTNDB尼龙保持器 50 130 31 147 121 3.84 DB pairing (P0, P6, P5 levels)
7811BTNDB尼龙保持器 55 72 9 23.6 23.6 0.116 DB pairing (P0, P6, P5 levels)
7911ACTNDB尼龙保持器 55 80 13 29.3 33.5 0.368 DB pairing (P0, P6, P5 levels)
7011ATNDB尼龙保持器 55 90 18 52.5 55.5 0.782 DB pairing (P0, P6, P5 levels)
7011BTNDB尼龙保持器 55 90 18 45.4 47.5 0.84 DB pairing (P0, P6, P5 levels)
7211ATNDB尼龙保持器 55 100 21 83 79 1.226 DB pairing (P0, P6, P5 levels)