Guidelines for shaft and housing tolerances 

Recommended machining tolerances for shafts for spindle bearings –tolerances

in μm

 

Nominal shaft

diameterDeviation Cylindricity Flatness Runout Coaxiality

Mean roughness

value

d Δdmpt1 t3 t4 t5 Ra

over incl. min. max.

–   10 –2 2 0,6 0,6 1   2,5 0,2

  10   18 –2,5 2,5 0,8 0,8 1,2   3 0,2

  18   30 –3 3 1 1 1,5   4 0,2

  30   50 –3,5 3,5 1 1 1,5   4 0,2

  50   80 –4 4 1,2 1,2 2   5 0,4

  80 120 –5 5 1,5 1,5 2,5   6 0,4

120 180 –6 6 2 2 3,5   8 0,4

180 250 –7 7 3 3 4,5 10 0,4 

Recommended machining tolerances for housings for

spindle bearings, part 1 –tolerances in μm

 

Nominal housing bore

Deviation

ΔDmp

DLocating bearing

Non-locating bearing

over incl. min. max. min. max.

  10   18 –2   +3 +2   +7

  18   30 –2   +4 +2   +8

  30   50 –3   +4 +3 +10

  50   80 –3   +5 +3 +11

  80 120 –4   +6 +4 +14

120 180 –4   +8 +5 +17

180 250 –4 +10 +7 +21

250 315 –4 +12 +8 +24

315 400 –5 +13 +9 +27 

Recommended machining tolerances for housings for

spindle bearings, part 2 –tolerances in μm

 

Nominal shaft

diameterCylindricity Flatness Runout Coaxiality

Mean roughness

depth

dt1 t3 t4 t5 Ra

over incl.

  10   18 1,2 1,2 2   3 0,4

  18   30 1,5 1,5 2,5   4 0,4

  30   50 1,5 1,5 2,5   4 0,4

  50   80 2 2 3   5 0,4

  80 120 2,5 2,5 4   6 0,8

120 180 3,5 3,5 5   8 0,8

180 250 4,5 4,5 7 10 0,8

250 315 6 6 8 12 1,6

315 400 7 7 9 13 1,6

Geometrical tolerances of bearing seating surfaces 

 

Tolerance symbols and definitions

 

Tolerance symbol

Designation / symbol Standard

d Nominal shaft diameter –

DNominal housing bore diameter

–

t1 Cylindricity ISO 1101

t3 Flatness ISO 1101

t4 Runout ISO 1101

t5 Coaxiality ISO 1101

Ra Mean roughness depth DIN 4768 

   

 

Geometrical tolerances for housing

   

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Geometrical tolerances for shaft

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