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Bearing Basics

Bearing Tolerance

The dimensional and running accuracy of rolling bearings has been standardized internationally, For dimensional accuracy, these standards prescribe the tolerances necessary when installing bearings on shafts or in housings. Running accuracy is defined as the allowable limits for bearing runout during operation.

Tolerance symbols and definitions

Tolerance symbol
Definition
d Nominal bore diameter
Δdmp Deviation of mean bore diameter in a single plane
Vdsp Variation of single bore diameter in a single plane
Vdmp Variation of mean bore diameter
D Nominal outside diameter
ΔDmp Deviation of mean outside diameter in a single plane
VDsp Variation of single outside diameter in a single plane
VDmp Variation of mean outside diameter
B Nominal inner ring width
ΔBs Deviation of a single inner ring width
VBs Variation of inner ring width
C Nominal outer ring width
ΔCs Deviation of a single outer ring width
VCs Variation of outer ring width
Kia Radial runout of inner ring of assembled bearing
Kea Radial runout of outer ring of assembled bearing
Sd Runout of inner ring face to the bore
SD Runout of outer ring outside surface generatrix to the face
Sia Axial runout of inner ring of assembled bearing
Sea Axial runout of outer ring of assembled bearing

 

Inner Ring
Grade d @dmp @ds Vdp Vdmp Kia Sd Sia @Bs Vbs
Diameter Series
mm 9 0,1 2,3,4
  over incl Max Min Max Min Max Max Max Max Max Max Min Max
ABEC1(P0) 2.5 10 0 -8     10 8 6 6 10     0 -120 15
10 18 0 -8     10 8 6 6 10     0 -120 20
18 30 0 -10     13 10 8 8 13     0 -120 20
30 50 0 -12     15 12 9 9 15     0 -120 20
50 80 0 -15     19 19 11 11 20     0 -150 25
80 120 0 -20     25 25 15 15 25     0 -200 25
120 180 0 -25     31 31 19 19 30     0 -250 30
ABEC3(P6) 2.5 10 0 -7     9 7 5 5 6     0 -120 15
10 18 0 -7     9 7 5 5 7     0 -120 20
18 30 0 -8     10 8 6 6 8     0 -120 20
30 50 0 -10     13 10 8 8 10     0 -120 20
50 80 0 -12     15 15 9 9 10     0 -150 25
80 120 0 -15     19 19 11 11 13     0 -200 25
120 180 0 -18     23 23 14 14 18     0 -250 30
ABEC5(P5) 2.5 10 0 -5     5 4 4 4 4 7 7 0 -40 5
10 18 0 -5     5 4 4 4 4 7 7 0 -80 5
18 30 0 -6     6 5 5 4 4 8 8 0 -120 5
30 50 0 -8     8 6 6 5 5 8 8 0 -120 5
50 80 0 -9     9 7 7 5 5 8 8 0 -150 6
80 120 0 -10     10 8 8 5 6 9 9 0 -200 7
120 180 0 -13     13 10 10 7 8 10 10 0 -250 8
ABEC7(P4)                                
2.5 10 0 -4 0 -4 4 3 3 2 2.5 3 3 0 -40 2.5
10 18 0 -4 0 -4 4 3 3 2 2.5 3 3 0 -80 2.5
18 30 0 -5 0 -5 5 4 4 2.5 3 4 4 0 -120 2.5
30 50 0 -6 0 -6 6 5 5 3 4 4 4 0 -120 3
50 80 0 -7 0 -7 7 5 5 3.5 4 5 5 0 -150 4
80 120 0 -8 0 -8 8 6 6 4 5 5 5 0 -200 4
120 180   -10 0 -10 10 8 8 5 6 6 6 0 -250 5
Marks:Series 0,1,2,3,4 only
Series 7,8 have no standard

 

Outer Ring
Grade D @Dmp @Ds VDp VDmp Kea SD Sea @Cs Vcs
Open Close
Series
mm 9 0,1 2,3,4 2,3,4
  over incl high low Max Min Max Max Max Max Max Max Min Max
ABEC1(P0) 2.5 6 0 -8     10 8 6 10 6 15     same as @Bs of inner ring same as Vbs of inner ring
6 18 0 -8     10 8 6 10 6 15    
18 30 0 -9     12 9 7 12 7 15    
30 50 0 -11     14 11 8 16 8 20    
50 80 0 -13     16 13 10 20 10 25    
80 120 0 -15     19 19 11 26 11 35    
120 150 0 -18     23 23 14 30 14 40    
150 180 0 -25     31 31 19 38 19 45    
180 250 0 -30     38 38 23 - 23 50    
ABEC3(P6) 2.5 6 0 -7     9 7 5 9 5 8    
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    
150 180 0 -18     23 23 14 30 14 23    
180 250 0 -20     25 25 15 - 15 25    
ABEC5(P5) 2.5 6 0 -5     5 4 4   3 5 8 8 5
6 18 0 -5     5 4 4   3 5 8 8 5
18 30 0 -6     6 5 5   3 6 8 8 5
30 50 0 -7     7 5 5   4 7 8 8 5
50 80 0 -9     9 7 7   5 8 8 10 6
80 120 0 -10     10 8 8   5 10 9 11 8
120 150 0 -11     11 8 8   6 11 10 13 8
150 180 0 -13     13 10 10   7 13 10 14 8
180 250 0 -15     15 11 11   8 15 11 15 10
ABEC7(P4) 2.5 6 0 -4 0 -4 4 3 3   2 3 4 5   2.5
6 18 0 -4 0 -4 4 3 3   2 3 4 5   2.5
18 30 0 -5 0 -5 5 4 4   2.5 4 4 5   2.5
30 50 0 -6 0 -6 6 5 5   3 5 4 5   2.5
50 80 0 -7 0 -7 7 5 5   3.5 5 4 5   3
80 120 0 -8 0 -8 8 6 6   4 6 5 6   4
120 150 0 -9 0 -9 9 7 7   5 7 5 7   5
150 180 0 -10 0 -10         5 8 5 8   5
180 250 0 -11 0 -11         6 10 7 10   7
Marks:Series 0,1,2,3,4 only
Series 7,8 have no standard

 

 

Chamfer dimensions.
rmin.
Or
r1min.
Nominal bore diameter Radial direction Axial direction
d
mm r max. or r1 max.
  over up to
0.05 - - 0.1 0.2
0.08 - - 0.16 0.3
0.1 - - 0.2 0.4
0.15 - - 0.3 0.6
0.2 - - 0.5 0.8
0.3 - 40 0.6 1
40 - 0.8 1
0.6 - 40 1 2
40 - 1.3 2
1 - 50 1.5 3
50 - 1.9 3
1.1 - 120 2 3.5
120 - 2.5 4
1.5 - 120 2.3 4
120 - 3 5
2 - 80 3 4.5
80 220 3.5 5
220 - 3.8 6

 

 

 

 

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