Housing bore tolerances

Housing bore for metric seals (ISO) Housing bore for inch seals (RMA)
Nominal Housing bore Fillet Nominal Housing bore Fillet radii
diameter (ISO tolerance H8) radii diameter tolerance
D D rmax
over incl. high low rmax over incl. high low
mm µm mm in. in. in.
3 +14 0 0,3 3.000 +0.001 -0.001 0.031
3 6 +18 0 0,3 3.000 7.000 +0.0015 -0.0015 0.031
6 10 +22 0 0,3 7.000 10.000 +0.002 -0.002 0.031
10 18 +27 0 0,3 10.0002) 12.000 +0.002 -0.002 0.031
18 30 +33 0 0,3 12.0002) 20.000 +0.003 -0.003 0.031
30 50 +39 0 0,3 20.0002) 40.000 +0.004 -0.004 0.031
50 80 +46 0 0,4 40.0002) 60.000 +0.006 -0.006 0.031
80 120 +54 0 0,8
120 180 +63 0 0,8
180 250 +72 0 0,8
250 315 +81 0 0,8
315 400 +89 0 0,8
400 500 +97 0 0,8
500 630 +110 0 0,8
630 800 +125 0 0,8
800 1 000 +140 0 0,8
1 000 1 250 +165 0 0,8
1 250 1 600 +195 0 0,8
1 600 2 000 +230 0 0,8
2 000 2 500 +280 0 0,8
2 500 3 150 +330 0 0.8
3 1501) 4 000 +410 0 0.8
4 0001) 5 000 +500 0 0.8
  1. 1) SKF recommended bore specifications not covered in ISO 286-2
  2. 2) SKF recommended bore specifications not covered in RMA OS-4

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