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Wolee Bearing Co.,Ltd is a Chinese factory specializing in Ball Bearings since 1995 in China. We supply high quality Stainless Steel Ball Bearing at reasonable prices and prompt delivery. Corrosion resistant bearings are key to further development. We also can supply many kind special bearings for stainless steel and carbon steel .If you have any special requirement please contact us maybe we can do that for you...

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» Ball bearings Technical Note - 2008-03-06
» Materials Lubrication Enclosure type - 2008-03-06
» Corrosion Resistance - 2008-03-06
» Accuracy Standard - 2008-03-06

 


  Accuracy Standard

ABMA (AFBMA) Standards,  ABEC Standards

 
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
 กก 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
 กก 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
 กก 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
 
The bearings accuracy corresponding for each country
Country Standard Accuracy Grade
China GB307.1 0 6 5 4 2
International  ISO 0 6 5 4 2
Sweden SKF P0 P6 P5 P4 P2
Germany DIN P0 P6 P5 P4 P2
Japan JIS P0 P6 P5 P4 P2
U.S.A ABMA ABEC-1 ABEC-3 ABEC-5 ABEC-7 ABEC-9

See super precision miniature bearings (ABEC 7) Bearings, please visit our precision division of WOLEE
2008-03-06
 
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