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）
7004ATNDB尼龙保持器 20 42 12 17.6 13.2 0.136 DB pairing (P0, P6, P5 levels)
7004BTNDB尼龙保持器 20 42 12 15.2 11.1 0.158 DB pairing (P0, P6, P5 levels)
7204ATNDB尼龙保持器 20 47 14 23.5 16.6 0.212 DB pairing (P0, P6, P5 levels)
7204BTNDB尼龙保持器 20 47 14 21.6 15.3 0.218 DB pairing (P0, P6, P5 levels)
7304CTNDB尼龙保持器 20 52 15 30.1 19.9 0.3 DB pairing (P0, P6, P5 levels)
7304ATNDB尼龙保持器 20 52 15 30.5 20.8 0.292 DB pairing (P0, P6, P5 levels)
7304BTNDB尼龙保持器 20 52 15 28.2 19.3 0.3 DB pairing (P0, P6, P5 levels)
7404ATNDB尼龙保持器 20 72 19 57.8 38.2 0.79 DB pairing (P0, P6, P5 levels)
7404BTNDB尼龙保持器 20 72 19 54.4 35.9 0.79 DB pairing (P0, P6, P5 levels)
7805BTNDB尼龙保持器 25 37 7 7.8 6.1 0.042 DB pairing (P0, P6, P5 levels)
7905ACTNDB尼龙保持器 25 42 9 12.1 10.3 0.086 DB pairing (P0, P6, P5 levels)
7005ATNDB尼龙保持器 25 47 12 18.3 14.8 0.158 DB pairing (P0, P6, P5 levels)
7005BTNDB尼龙保持器 25 47 12 16.6 13.4 0.182 DB pairing (P0, P6, P5 levels)
7205ATNDB尼龙保持器 25 52 15 26.3 20.5 0.26 DB pairing (P0, P6, P5 levels)
7205BTNDB尼龙保持器 25 52 15 24 18.8 0.266 DB pairing (P0, P6, P5 levels)
7305CTNDB尼龙保持器 25 62 17 42.8 30.6 0.486 DB pairing (P0, P6, P5 levels)
7305ATNDB尼龙保持器 25 62 17 43 31.5 0.47 DB pairing (P0, P6, P5 levels)
7305BTNDB尼龙保持器 25 62 17 39.5 29.3 0.482 DB pairing (P0, P6, P5 levels)
7405ATNDB尼龙保持器 25 80 21 64.5 46.3 1.054 DB pairing (P0, P6, P5 levels)
7405BTNDB尼龙保持器 25 80 21 60 43 1.054 DB pairing (P0, P6, P5 levels)