ball and roller bearings - NTN Bearing Corporation of

TOLERANCE CLASS ABEC-7
Tolerance limits for:
Metric radial and angular contact ball bearings (except instrument bearings).
INNER RING
BASIC BORE DIAMETER
d
SINGLE PLANE
MEAN OUTER
DIAMETER
DEVIATION
SINGLE RADIAL PLANE BORE
DIAMETER VARIATION
Vdp Bearings of
SINGLE PLANE MEAN
BORE DIAMETER
DEVIATIONS
Vdmp Radial
RUNOUT
Reference Raceway
Side With
With Reference
WIDTH
Allowable Deviations from B
Normal Modified
Variation
of Bs in
Basic Diameter Series Bore Side Single Single Individual
Bearings Bearings Bearings Ring
mm
Over Incl.
inch
Over Incl.
dmp Low High
7,8,9 0,1,2,3,4
Max Max
Kia Max.
Sd Max.
Sia Max.
Bs High Low
Bs High Low
VBs Max.
.6 10 .0236 .3937 - 1.5 + 0 1.5 1 1 1.0 1.0 1.0 + 0 - 16 + 0 - 100 1.0
10 18 .3937 .7087 - 1.5 + 0 1.5 1 1 1.0 1.0 1.0 + 0 - 32 + 0 - 100 1.0
18 30 .7087 1.1811 - 1.5 + 0 2 1.5 1 1.0 1.5 1.5 + 0 - 50 + 0 - 100 1.0
30 50 1.1811 1.9685 - 2.0 + 0 2.5 2 1 1.5 1.5 1.5 + 0 - 50 + 0 - 100 1.0
50 80 1.9685 3.1496 - 2.0 + 0 3 2 1.5 1.5 2.0 1.5 + 0 - 60 + 0 - 100 1.5
80 120 3.1496 4.7244 - 2.5 + 0 3 2.5 1.5 2.0 2.0 2.0 + 0 - 80 + 0 - 150 1.5
120 180 4.7244 7.0866 - 3.0 + 0 4 3 2 3.0 3.0 3.0 + 0 - 100 + 0 - 150 2.0
180 250 7.0866 9.8425 - 4.0 + 0 4.5 3.5 2.5 3.0 3.0 3.0 + 0 - 120 + 0 - 200 2.0
250 315 9.8425 12.4015 - 5.0 + 0 — — — 4.0 4.0 4.0 + 0 - 140 + 0 - 200 3.0
SINGLE RADIAL PLANE RUNOUT WIDTH
BASIC OUTSIDE DIAMETER OUTSIDE DIAMETER VARIATION
D V Dp
All Bearings Open Bearings Bearings with Variation
Shields or Seals Radial Cylindrical Raceway Limits of B s in
Bearings of Diameter Series Surface with Individual
Diameter Series with Reference Ring
Reference Side
7,8,9 0,1,2,3,4 4,3,2,1,0 Side
mm inch V dmp K ea S D S ea V Bs
Over Incl. Over Incl. High Low Max Max Max. Max. Max. Max.
2.5
6
6
18
.0984
.2362
.2362
.7087
+ 0
+ 0
- 2
- 2
1.5
1.5
1
1
1
1
2
1.5 1.5
1
2
Identical
1
18
30
30
50
.7087
1.1811
1.1811
1.9685
+ 0
+ 0
- 2
- 2
2
2.5
1.5
2
1
1
1.5
2.0
1.5
1.5
2
2
to those
1
1
50
80
80
120
1.9685
3.1496
3.1496
4.7244
+ 0
+ 0
- 2
- 3
3
3
2
2.5
1.5
1.5
2.0
2.0
1.5
2.0
2
2 of inner
1
2
120
150
150
180
4.7244
5.9055
5.9055
7.0866
+ 0
+ 0
- 4
- 4
3.5
4
3
3
2
2
3.0
3.0
2.0
2.0
3
3 ring of
2
2
180 250 7.0866 9.8425 + 0 - 4 4.5 3 2.5 4.0 3.0 4 3
250 315 9.8425 12.4015 + 0 - 5 5 4 3 4.0 3.0 4 the same 3
315 400 12.4015 15.7480 + 0 - 5 6 4.5 3 5.0 4.0 5 3
400 500 15.7480 19.6850 + 0 - 6 — — — 5.0 4.0 5
bearing
4
For Instrument Ball Bearing tolerances see AFBMA Standard 12, ANSI B3.10.
Does not apply to self-aligning ball bearings.
This refers to a ball bearing on which one or both sides are modified so two or more bearings can be mounted side by side as a unit.
For bearings with shields or seals of diameter series 9 and 8, Ds is not restricted.
Applies to bearings of width series 1 or narrower.
No values have been established for capped bearings.
Table 3 (Tolerance Limits in 0.0001 inch)
OUTER RING
TOLERANCE
TABLES
257