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）
7838BTNDB尼龙保持器 190 240 24 118 214 4.94 DB pairing (P0, P6, P5 levels)
7938CTNDB尼龙保持器 190 260 33 239 385 9.96 DB pairing (P0, P6, P5 levels)
7938ATNDB尼龙保持器 190 260 33 216 350 10.04 DB pairing (P0, P6, P5 levels)
7938BTNDB尼龙保持器 190 260 33 192 315 10.14 DB pairing (P0, P6, P5 levels)
7038ATNDB尼龙保持器 190 290 46 365 560 22.6 DB pairing (P0, P6, P5 levels)
7038BTNDB尼龙保持器 190 290 46 325 505 21.6 DB pairing (P0, P6, P5 levels)
7238ATNDB尼龙保持器 190 340 55 510 825 44.8 DB pairing (P0, P6, P5 levels)
7238BTNDB尼龙保持器 190 340 55 460 750 45 DB pairing (P0, P6, P5 levels)
7338ATNDB尼龙保持器 190 400 78 730 1200 95 DB pairing (P0, P6, P5 levels)
7338BTNDB尼龙保持器 190 400 78 670 1100 94.4 DB pairing (P0, P6, P5 levels)
7840ATNDB尼龙保持器 200 250 24 134 247 5.22 DB pairing (P0, P6, P5 levels)
7840BTNDB尼龙保持器 200 250 24 119 221 5.18 DB pairing (P0, P6, P5 levels)
7940ATNDB尼龙保持器 200 280 38 278 445 14 DB pairing (P0, P6, P5 levels)
7940CTNDB尼龙保持器 200 280 38 305 490 13.7 DB pairing (P0, P6, P5 levels)
7940BTNDB尼龙保持器 200 280 38 247 400 13.98 DB pairing (P0, P6, P5 levels)
7040ATNDB尼龙保持器 200 310 51 390 620 27.4 DB pairing (P0, P6, P5 levels)
7040BTNDB尼龙保持器 200 310 51 350 560 25.4 DB pairing (P0, P6, P5 levels)
7240ATNDB尼龙保持器 200 360 58 550 900 53 DB pairing (P0, P6, P5 levels)
7240BTNDB尼龙保持器 200 360 58 495 815 53.2 DB pairing (P0, P6, P5 levels)
7340ATNDB尼龙保持器 200 420 80 770 1320 108.8 DB pairing (P0, P6, P5 levels)