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）
78/670BTNDB尼龙保持器 670 820 69 680 1890 152.6 DB pairing (P0, P6, P5 levels)
78/1060ATNDB尼龙保持器 1060 1280 100 1430 5350 510 DB pairing (P0, P6, P5 levels)
7000AMDB车削铜保持器 10 26 8 8.75 5.2 0.038 DB pairing (P0, P6, P5 levels)
7000BMDB车削铜保持器 10 26 8 7.55 4.35 0.042 DB pairing (P0, P6, P5 levels)
7200AMDB车削铜保持器 10 30 9 8.8 5.4 0.064 DB pairing (P0, P6, P5 levels)
7200BMDB车削铜保持器 10 30 9 8.1 5 0.064 DB pairing (P0, P6, P5 levels)
7300CMDB车削铜保持器 10 35 11 16 9.25 0.11 DB pairing (P0, P6, P5 levels)
7300AMDB车削铜保持器 10 35 11 15.1 8.6 0.106 DB pairing (P0, P6, P5 levels)
7300BMDB车削铜保持器 10 35 11 14.2 8.1 0.108 DB pairing (P0, P6, P5 levels)
7001AMDB车削铜保持器 12 28 8 9.4 5.95 0.042 DB pairing (P0, P6, P5 levels)
7001BMDB车削铜保持器 12 28 8 8.1 5.05 0.048 DB pairing (P0, P6, P5 levels)
7201AMDB车削铜保持器 12 32 10 13 8.05 0.074 DB pairing (P0, P6, P5 levels)
7201BMDB车削铜保持器 12 32 10 12.1 7.5 0.076 DB pairing (P0, P6, P5 levels)
7301CMDB车削铜保持器 12 37 12 17.5 9.8 0.126 DB pairing (P0, P6, P5 levels)
7301AMDB车削铜保持器 12 37 12 15.4 9 0.12 DB pairing (P0, P6, P5 levels)
7301BMDB车削铜保持器 12 37 12 14.4 8.4 0.124 DB pairing (P0, P6, P5 levels)
7002AMDB车削铜保持器 15 32 9 9.95 6.85 0.06 DB pairing (P0, P6, P5 levels)
7002BMDB车削铜保持器 15 32 9 9.05 6.3 0.07 DB pairing (P0, P6, P5 levels)
7202AMDB车削铜保持器 15 35 11 14 9.3 0.09 DB pairing (P0, P6, P5 levels)
7202BMDB车削铜保持器 15 35 11 12.9 8.6 0.092 DB pairing (P0, P6, P5 levels)