NTN - Ball and Roller Bearings

TOLERANCE CLASS ABEC-1, RBEC-1
Tolerance limits for:
Metric ball and roller bearings (except tapered roller bearings) conforming to basic
boundary plans.
TOLERANCE
TABLES
Table 1 (Tolerance Limits in 0.0001 inch)
INNER RING
BORE Single Radial Plane Bore Single Plane MEAn Bore
WIDTH
BASIC BORE DIAMETER Allowable Diameter VARIATION Diameter DEVIATIONS RADIAL Allowable Deviations
d Deviations
V dp
V dmp
RUNOUT from B
Diameter Series
Normal
Modified
Single Bearings Single Bearings
mm inch d mp
Max. Max. K ia
B s
B s
Over Incl. Over Incl. Low High 0.1 2,3,4 Max. High Low High Low
2.5 10 .0984 .3937 - 3 + 0 3 2.5 2.5 3 + 0 - 50 + 0 - 100
10 18 .3937 .7087 - 3 + 0 3 2.5 2.5 4 + 0 - 50 + 0 - 100
18 30 .7087 1.1811 - 4 + 0 3 2.5 2.5 5 + 0 - 50 + 0 - 100
30 50 1.1811 1.9685 - 5 + 0 4 3 3 6 + 0 - 50 + 0 - 100
50 80 1.9685 3.1496 - 6 + 0 4.5 3.5 3.5 8 + 0 - 60 + 0 - 150
80 120 3.1496 4.7244 - 8 + 0 7.5 4.5 4.5 10 + 0 - 80 + 0 - 150
120 180 4.7244 7.0866 - 10 + 0 10 6 6 12 + 0 - 100 + 0 - 200
180 250 7.0866 9.8425 - 12 + 0 12 7.5 7.5 16 + 0 - 120 + 0 - 200
250 315 9.8425 12.4015 - 14 + 0 15 9 9 20 + 0 - 140 + 0 - 200
315 400 12.4015 15.7480 - 16 + 0 17 10 10 24 + 0 - 160 + 0 - 250
400 500 15.7480 19.6850 - 18 + 0 20 12 12 26 + 0 - 180 — —
500 630 19.6850 24.8031 - 20 + 0 22 13 13 28 + 0 - 200 — —
630 800 24.8031 31.4961 - 30 + 0 25 15 15 32 + 0 - 300 — —
800 1000 31.4961 39.3701 - 40 + 0 — — — 35 + 0 - 400 — —
1000 1250 39.3701 49.2126 - 50 + 0 — — — — + 0 - 500 — —
1250 1600 49.2126 62.9921 - 60 + 0 — — — — + 0 - 600 — —
1600 2000 62.9921 78.7402 - 80 + 0 — — — — + 0 - 800 — —
OUTER RING
SINGLE RADIAL PLANE
SINGLE PLANE
BASIC OUTSIDE DIAMETER
OUTSIDE DIAMETER VARIATION
MEAN OUTSIDE
RADIAL WIDTH
D
V Dp
DIAMETER VARIATION
RUNOUT LIMITS
V
All Bearings Open Bearings with Shields
Dmp
Bearings
or Seals
mm inch V dmp
Max. K ea
Over Incl. Over Incl. High Low 0.1 2,3,4 2,3,4 Max.
6 18 .2362 .7087 + 0 - 3 3 2.5 4 2.5 6
18 30 .7087 1.1811 + 0 - 4 3.5 3 4.5 3 6
30 50 1.1811 1.9685 + 0 - 5 4.5 3 6.5 3 8 Identical
50 80 1.9685 3.1496 + 0 - 5 5 4 8 4 10
80 120 3.1496 4.7244 + 0 - 6 7.5 4.5 10 4.5 14
120 150 4.7244 5.9055 + 0 - 8 9 5.5 12 5.5 16
to those
150 180 5.9055 7.0866 + 0 - 10 12 7.5 15 7.5 18
180 250 7.0866 9.8425 + 0 - 12 15 9 — 9 20
250 315 9.8425 12.4015 + 0 - 14 17 10 — 10 24
315 400 12.4015 15.7480 + 0 - 16 20 12 — 12 28
400 500 15.7480 19.6850 + 0 - 18 22 13 — 13 32
500 630 19.6850 24.8031 + 0 - 20 25 15 — 15 40
630 800 24.8031 31.4961 + 0 - 30 37 22 — 22 47
800 1000 31.4961 39.3701 + 0 - 40 49 30 — 30 55
1000 1250 39.3701 49.2126 + 0 - 50 — — — — 64
1250 1600 49.2126 62.9921 + 0 - 65 — — — — 76
1600 2000 62.9921 78.7402 + 0 - 80 — — — — 90
2000 2500 78.7402 98.4252 + 0 - 100 — — — — —
Bore tolerance limits do not apply to tapered bore inner rings.
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.
Applies before mounting and after removal of internal or external snap ring.
No values have been established for diameter series 0 and 1.
of inner
ring of
the same
bearing
255