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）
7418BTNDB尼龙保持器 90 225 54 325 364 22.8 DB pairing (P0, P6, P5 levels)
7919ACTNDB尼龙保持器 95 130 18 4.8 6.7 1.194 DB pairing (P0, P6, P5 levels)
7019ATNDB尼龙保持器 95 145 24 3.8 5 2.86 DB pairing (P0, P6, P5 levels)
7019BTNDB尼龙保持器 95 145 24 97 121 2.64 DB pairing (P0, P6, P5 levels)
7219ATNDB尼龙保持器 95 170 32 2.6 3.6 5.36 DB pairing (P0, P6, P5 levels)
7219BTNDB尼龙保持器 95 170 32 1.9 2.6 5.48 DB pairing (P0, P6, P5 levels)
7319CTNDB尼龙保持器 95 200 45 300 319 12.24 DB pairing (P0, P6, P5 levels)
7319ATNDB尼龙保持器 95 200 45 1.9 2.6 11.66 DB pairing (P0, P6, P5 levels)
7319BTNDB尼龙保持器 95 200 45 1.7 2.4 11.96 DB pairing (P0, P6, P5 levels)
7820ATNDB尼龙保持器 100 125 13 34 50.5 0.72 DB pairing (P0, P6, P5 levels)
7920ACTNDB尼龙保持器 100 140 20 4.5 6.3 1.608 DB pairing (P0, P6, P5 levels)
7920ATNDB尼龙保持器 100 140 20 78 105 1.86 DB pairing (P0, P6, P5 levels)
7020ATNDB尼龙保持器 100 150 24 3.6 5 2.96 DB pairing (P0, P6, P5 levels)
7020BTNDB尼龙保持器 100 150 24 99.5 127 2.74 DB pairing (P0, P6, P5 levels)
7220ATNDB尼龙保持器 100 180 34 233 251 6.44 DB pairing (P0, P6, P5 levels)
7220BTNDB尼龙保持器 100 180 34 212 229 6.56 DB pairing (P0, P6, P5 levels)
7320CTNDB尼龙保持器 100 215 47 320 346 15.06 DB pairing (P0, P6, P5 levels)
7320ATNDB尼龙保持器 100 215 47 335 385 14.58 DB pairing (P0, P6, P5 levels)
7320BTNDB尼龙保持器 100 215 47 310 355 14.86 DB pairing (P0, P6, P5 levels)
7821ATNDB尼龙保持器 105 130 13 35 53 0.74 DB pairing (P0, P6, P5 levels)