table 1 - Tolerances for solid steel shafts - seats for radial ball bearings 1)

Conditions Shaft diameter Dimensional
tolerance2)		 Total radial
run-out
tolerance3)		 Total axial
run-out
tolerance3)		 Ra

mm – – – µm






Rotating inner ring load or direction of load indeterminate
Light loads (P = 0,05 C) = 17 js5 IT4/2 IT4 0,4

> 17 to 100 j6 IT5/2 IT5 0,8

> 100 to 140 k6 IT5/2 IT5 1,6






Normal to heavy loads (0,05 C < P = 0,1 C) = 10 js5 IT4/2 IT4 0,4
> 10 to 17 j5 IT4/2 IT4 0,4

> 17 to 100 k5 IT4/2 IT4 0,8

> 100 to 140 m5 IT4/2 IT4 0,8

> 140 to 200 m6 IT5/2 IT5 1,6

> 200 to 500 n6 IT5/2 IT5 1,6

> 500 p7 IT6/2 IT6 3,2






Stationary inner ring load
Easy axial displacement of inner ring on shaft desirable g64) IT5/2 IT5 1,6
Easy axial displacement of inner ring on shaft unnecessary h6 IT5/2 IT5 1,6






Axial loads only j6 IT5/2 IT5 1,6






  1. 1)
    For insert bearings ?  Design considerations.
  2. 2)
    Envelope requirement (symbol ? from ISO 14405-1) not written but applies.
  3. 3)
    Values listed are for bearings to Normal tolerances. For bearings with tighter tolerance classes, use the recommendations in this table.
  4. 4)
    Depending on bearing size, a shifted g6? tolerance may be needed to obtain a loose fit.

table 4 - Tolerances for cast iron and steel housings – seats for radial bearings 1)


 Conditions Dimensional
tolerance2)		 Total radial
run-out
tolerance
Total axial
run-out
tolerance
Ra6) Displacement
of outer ring


– – – µm –







For non-split housings only Rotating outer ring load

Heavy loads on bearings in thin-walled housings,
heavy peak loads (P > 0,1 C)		 P7 IT6/2 IT6 3,2 Cannot be displaced








Normal to heavy loads (P > 0,05 C) N7 IT6/2 IT6 3,2 Cannot be displaced








Light and variable loads (P = 0,05 C) M7 IT6/2 IT6 3,2 Cannot be displaced








Direction of load indeterminate

Heavy peak loads M7 IT6/2 IT6 3,2 Cannot be displaced








Normal to heavy loads (P > 0,05 C),
axial displacement of outer ring unnecessary		 K75) IT6/2 IT6 3,2 In most cases,
cannot be displaced














For non-split housings
and split housings		 Direction of load indeterminate

Light to normal loads (P = 0,1 C),
axial displacement of outer ring desirable		 J7 IT6/2 IT6 3,2 In most cases,
can be displaced








Stationary outer ring load

Loads of all kinds H73) IT6/2 IT6 3,2 Can be displaced








Light to normal loads (P = 0,1 C)
with simple working conditions		 H83) IT6/2 IT6 3,2 Can be displaced








Thermal expansion of the shaft G74) IT6/2 IT6 3,2 Can be displaced







  1. 1)
    For drawn cup, alignment and combined needle roller bearings:
  2. 2)
    The envelope requirement (symbol ? from ISO 14405-1) is not shown but applies to all tolerance classes.
  3. 3)
    For large bearings (D > 250 mm), or temperature differences between the outer ring and housing > 10 °C (18 °F), tolerance classes G7?/G8? should be used instead of tolerance classes H7?/H8?.
  4. 4)
    For large bearings (D > 500 mm), or temperature differences between the outer ring and housing > 10 °C (18 °F), tolerance class F7? should be used instead of tolerance class G7?.
  5. 5)
    A split housing is allowed provided housing halves are well aligned during machining of the housing, with relief chamfers at the split.
  6. 6)
    For D > 500 mm, use Ra = 6,3 µm.