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）
7806BTNDB尼龙保持器 30 42 7 11.2 9.1 0.05 DB pairing (P0, P6, P5 levels)
7906ACTNDB尼龙保持器 30 47 9 12.8 11.9 0.1 DB pairing (P0, P6, P5 levels)
7006ATNDB尼龙保持器 30 55 13 23.6 20.2 0.232 DB pairing (P0, P6, P5 levels)
7006BTNDB尼龙保持器 30 55 13 21.3 18.4 0.266 DB pairing (P0, P6, P5 levels)
7206ATNDB尼龙保持器 30 62 16 36.5 29.5 0.394 DB pairing (P0, P6, P5 levels)
7206BTNDB尼龙保持器 30 62 16 33.5 27 0.404 DB pairing (P0, P6, P5 levels)
7306CTNDB尼龙保持器 30 72 19 52.5 40.5 0.724 DB pairing (P0, P6, P5 levels)
7306ATNDB尼龙保持器 30 72 19 54.5 41.5 0.692 DB pairing (P0, P6, P5 levels)
7306BTNDB尼龙保持器 30 72 19 50.5 38.5 0.708 DB pairing (P0, P6, P5 levels)
7406ATNDB尼龙保持器 30 90 23 77.3 56.9 1.372 DB pairing (P0, P6, P5 levels)
7406BTNDB尼龙保持器 30 90 23 71.8 52.8 1.372 DB pairing (P0, P6, P5 levels)
7807BTNDB尼龙保持器 35 47 7 12 10.6 0.054 DB pairing (P0, P6, P5 levels)
7907ACTNDB尼龙保持器 35 55 10 18.6 17.4 0.15 DB pairing (P0, P6, P5 levels)
7007ATNDB尼龙保持器 35 62 14 29.7 26.8 0.306 DB pairing (P0, P6, P5 levels)
7007BTNDB尼龙保持器 35 62 14 25.7 22.8 0.34 DB pairing (P0, P6, P5 levels)
7207ATNDB尼龙保持器 35 72 17 48.5 40 0.574 DB pairing (P0, P6, P5 levels)
7207BTNDB尼龙保持器 35 72 17 44 36.5 0.588 DB pairing (P0, P6, P5 levels)
7307CTNDB尼龙保持器 35 80 21 61.6 47.2 0.95 DB pairing (P0, P6, P5 levels)
7307ATNDB尼龙保持器 35 80 21 65 52.5 0.928 DB pairing (P0, P6, P5 levels)
7307BTNDB尼龙保持器 35 80 21 59.5 48.5 0.948 DB pairing (P0, P6, P5 levels)