DF pairing (P0, P6, P5 levels)

DF pairing is one of the three classic paired installation methods for angular contact ball bearings, with the full name Double Face to Face and code DF. The core is to install two angular contact ball bearings of the same specification with the narrow outer edge facing each other and the wide inner edge facing each other, with the contact angle centerline converging towards the inside of the bearing to form an "inner eight" layout. It is suitable for radial loads and bidirectional axial loads, with small shaft span and high concentricity requirements. It is a commonly used choice for compact shaft systems such as pump valves, motor end caps, and small spindles, and can be adapted to a full range of angular contact ball bearings such as 7000C/AC/B and AC7000 full ceramic types.

Model Basic Dimensions Basic rated dynamic load WeightType
Inner diameter Outer diameter Thickness Dynamic load Static load
[mm] [mm] [mm] (kN) (kN) （kg）
7211BTNDF尼龙保持器 55 100 21 75 72 1.254 DF pairing (P0, P6, P5 levels)
7311CTNDF尼龙保持器 55 120 29 141 121 2.9 DF pairing (P0, P6, P5 levels)
7311ATNDF尼龙保持器 55 120 29 139 123 2.82 DF pairing (P0, P6, P5 levels)
7311BTNDF尼龙保持器 55 120 29 128 113 2.9 DF pairing (P0, P6, P5 levels)
7411ATNDF尼龙保持器 55 140 33 192 165 4.72 DF pairing (P0, P6, P5 levels)
7411BTNDF尼龙保持器 55 140 33 179 153 4.72 DF pairing (P0, P6, P5 levels)
7812BTNDF尼龙保持器 60 78 10 24.4 25.8 0.14 DF pairing (P0, P6, P5 levels)
7912ACTNDF尼龙保持器 60 85 13 29.8 35.5 0.394 DF pairing (P0, P6, P5 levels)
7012ATNDF尼龙保持器 60 95 18 53.5 59 0.834 DF pairing (P0, P6, P5 levels)
7012BTNDF尼龙保持器 60 95 18 46.4 50.7 0.9 DF pairing (P0, P6, P5 levels)
7212ATNDF尼龙保持器 60 110 22 100 97.5 1.596 DF pairing (P0, P6, P5 levels)
7212BTNDF尼龙保持器 60 110 22 91 89 1.63 DF pairing (P0, P6, P5 levels)
7312CTNDF尼龙保持器 60 130 31 161 141 3.62 DF pairing (P0, P6, P5 levels)
7312ATNDF尼龙保持器 60 130 31 159 143 3.48 DF pairing (P0, P6, P5 levels)
7312BTNDF尼龙保持器 60 130 31 146 131 3.56 DF pairing (P0, P6, P5 levels)
7412ATNDF尼龙保持器 60 150 35 209 187 5.7 DF pairing (P0, P6, P5 levels)
7412BTNDF尼龙保持器 60 150 35 194 173 5.7 DF pairing (P0, P6, P5 levels)
7813BTNDF尼龙保持器 65 85 10 30.6 32 0.17 DF pairing (P0, P6, P5 levels)
7913ACTNDF尼龙保持器 65 90 13 31 39 0.422 DF pairing (P0, P6, P5 levels)
7013ATNDF尼龙保持器 65 100 18 56.5 65.5 0.91 DF pairing (P0, P6, P5 levels)