Fits for split or one-piece cast iron and steel housings (for radial bearings)
Conditions Examples Tolerance class1) Displacement
of outer ring
Direction of load indeterminate
Light to normal loads (P ≤ 0,1 C) Medium-size electric motors J7 Can be displaced as a
axial displacement of outer ring and generators, pumps, crankshaft rule, but some (induced)
desirable bearings axial force might occur
Stationary outer ring load
Loads of all kinds General engineering, railway H72) Can be displaced as a rule
axleboxes
Light to normal loads (P ≤ 0,1 C) General engineering H8 Can be displaced
with simple working conditions
Thermal expansion of the shaft Drying cylinders, large electrical G73) Can be displaced
machines with spherical roller
bearings
1) For ball bearings when D ≤ 100 mm, tolerance grade IT6 is often preferable and is recommend for bearings with thin-walled
rings, e.g. in the 7, 8 or 9 diameter series. For these series, cylindricity tolerance grade IT4 is also recommended.
2) For large bearings
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