ABMA(AFBMA)STANDARDS

Tolerance in .0001"



ABEC 1
INNER RING
BORE DIAMETER Tol. for Bore Radial
Runout
MM INCH dm
Over Incl. Over Incl. Low High
0 10 0 .3937 -3 +0 4
10 18 .3937 .7087 -3 +0 4
18 30 .7087 1.1811 -4 +0 5
30 50 1.1811 1.9685 -4.5 +0 6
50 80 1.9685 3.1496 -6 +0 8
@ OUTER RING
OUTSIDE DIAMETER Tol. for outer
diameter
Radial
Runout
MM INCH dm
Over Incl. Over Incl. Low High
0 18 0 .7087 +0 -3 6
18 30 .7087 1.1811 +0 -3.5 6
30 50 1.1811 1.9685 +0 -4.5 8
50 80 1.9685 3.1496 +0 -5 10
80 120 3.1496 4.7244 +0 -6 14


ABEC 3
INNER RING
BORE DIAMETER Tol. for Bore Radial
Runout
MM INCH dm
Over Incl. Over Incl. Low High
0 10 0 .3937 -3 +0 2.5
10 18 .3937 .7087 -3 +0 3
18 30 .7087 1.1811 -3 +0 3
30 50 1.1811 1.9685 -4 +0 4
50 80 1.9685 3.1496 -4.5 +0 4
@ OUTER RING
OUTSIDE DIAMETER Tol. for outer
diameter
Radial
Runout
MM INCH dm
Over Incl. Over Incl. Low High
0 18 0 .7087 +0 -3 3
18 30 .7087 1.1811 +0 -3 3.5
30 50 1.1811 1.9685 +0 -3.5 4
50 80 1.9685 3.1496 +0 -4.5 5
80 120 3.1496 4.7244 +0 -5 7


WIDTH TOLERANCES
ABEC 1, ABEC 3

BEARINGS OTHER THAN DUPLEX, WIDTH OF INDIVIDUAL INNER OR OUTER RING
Nominal Bore in MM. Width Tolerance
Over Incl. + -
0 50 0 47
@ DUPLEX BEARINGS *
TOTAL WIDTH OF INNER OR OUTER RINGS

Nominal Bore in MM. Width Tolerance
Over Incl. + -
0 50 0 98

* If other than a pair of bearings is involved, the tolerance is in proportion to the number of bearings.



RADIAL INTERNAL CLEARANCE, SINGLE ROW, RADIAL CONTACT, BALL BEARINGS
Tolerance Limits for Radial Internal Clearance of Single Row, Radial Contact Ball Bearings under no load (Applicable to Bearings of ABEC 1, ABEC 3, ABEC 5 and ABEC 7 Tolerance Classes)
Basic
Bore
Diameter
d
SYMBOL 2 SYMBOL 0 SYMBOL 3 SYMBOL 4
mm
Over Incl. Low High Low High Low High Low High
6 10 0 3 1 5 3 9 6 11
10 18 0 3.5 1 7 4 10 7 13
18 24 0 4 2 8 5 11 8 14
24 30 0.5 4.5 2 8 5 11 9 16
30 40 0.5 4.5 2 8 6 13 11 18
40 50 0.5 4.5 2.5 9 7 14 12 20
50 65 0.5 6 3.5 11 9 17 15 24
65 80 0.5 6 4 12 10 20 18 28

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