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PFI Quality : Accuracy

Our bearings are manufactured to ABEC 3 (ISO 492 class 6) dimensional tolerances.

Tolerances for Class 6 Radial Bearings (excluding Tapered Roller Bearings)

(Inner Rings and Widths of Outer Rings - Table 1) (Units: µm)
  Vdp 
Nominal Outside Diameter d (mm)ΔdmpDiameter SeriesVdmp
  7,8,90,12,3,4 
Over Incl. High Low Max Max
2.5 10 0 -7 9 7 5 5
10 18 0 -7 9 7 6 5
18 30 0 -8 10 8 6 6
30 50 0 -10 13 10 8 8
50 80 0 -12 15 15 9 9

Tolerances for Class 6 Radial Bearings (excluding Tapered Roller Bearings)

(Inner Rings and Widths of Outer Rings - Table 2) (Units: µm)
Nominal Bore Diameter d (mm)ΔBsVBsKia
Over Incl. High Low Max Max
2.5 10 0 -120 15 6
10 18 0 -120 20 7
18 30 0 -120 20 8
30 50 0 -120 20 10
50 80 0 -150 25 10

Tolerances for Class 6 Radial Bearings (excluding Tapered Roller Bearings)

(Outer Rings) (Units: µm)
    V Dp  
Nominal Outside Diameter d (mm)ΔDmp Open TypeShielded/SealedVDmpKea
    Diameter Series  
Over Incl. High Low 7,8,9 0,1 2,3,4 0,1,2,3,4 Max Max
6 18 0 -7 9 7 5 9 5 8
18 30 0 -8 10 8 6 10 6 9
30 50 0 -9 11 9 7 13 7 10
50 80 0 -11 14 11 8 16 8 13
80 120 0 -13 16 16 10 20 10 18
120 150 0 -15 19 19 11 25 11 20

Tolerances for Class 6 Metric Design Tapered Roller Bearings

(Inner Ring Bore Diameter and Running Accuracy) (Units: µm)
Nominal Bore Diameter d (mm)ΔdmpVdpVdmpKia
Over Incl. High Low Max Max Max
10 18 0 -7 7 5 7
18 30 0 -8 8 6 8
30 50 0 -10 10 8 10
50 80 0 -12 12 9 10
80 120 0 -15 15 11 13

Tolerances for Class 6 Metric Design Tapered Roller Bearings

(Outer Ring Outside Diameter and Running Accuracy) (Units: µm)
Nominal Bore Diameter d (mm)ΔDmpVDpVD mpKea
Over Incl. High Low Max Max Max
18 30 0 -8 8 6 9
30 50 0 -9 9 7 10
50 80 0 -11 11 8 13
80 120 0 -13 13 10 18
120 150 0 -15 15 11 20
150 180 0 -18 18 14 23

Tolerances for Class 6 Metric Design Taper Roller Bearings

(Width) (Units: µm)
Nominal Bore Diameter d (mm)ΔB sΔCsΔTs
Over Incl. High Low High Low High Low
10 18 0 -120 0 -120 200 0
18 30 0 -120 0 -120 200 0
30 50 0 -120 0 -120 200 0
50 80 0 -150 0 -150 200 0
80 120 0 -200 0 -120 200 -200