Progress in technology necessitates standardization in all areas of design and manufacture. Rolling elements Bearings are no exception. The Bearing industry early recognized the need for international Bearing standards and has worked continuously for their development worldwide.
 
Bearing Standard
Tolerance Class
Bearing Types
AFBMA
AFBMA/ANSI
Std. 20
ABEC-1RBEC-1
ABEC-3RBEC-3
ABEC-5 RBEC-5
ABEC-7
ABEC-9
Radial Bearings (except Tapered Roller Bearings)
AFBMA/ANSI
Std. 19.1
Class K
Class N
Class C
Class B
Class A
Tapered Roller Bearings (Metric Series)
AFBMA B 3.19 ANSI Std. 19
Class 4
Class 2
Class 3
Class 0
Class 00
Tapered roller bearings (Inch series)
ANSI
AFBMA/ANSI
Std. 12.1
Class 3P
Class5P
Class 5T
Class7P
Class 7T
Class 9P
Precision instrument ball bearings (Metric series)
AFBMA/ANSI
Std. 12.2
Class 3P
Class5P
Class 5T
Class7P
Class 7T
Class 9P
Precision instrument ball bearings
(Inch series)
ISO
ISO 492
Normal
class
Class 6X
Class 6
Class 5
Class 4
Class 2
Radial bearings
ISO 199
Normal class
Class 6
Class 5
Class 4
Thrust ball bearings
ISO 578
Class 4
Class 3
Class 0
Class 00
Tapered roller bearings (Inch series)
ISO 1224
Class 5A
Class 4A
Precision instrument bearings
JIS
JIS B 1514
Class 0
Class 6X
Class 6
Class 5
Class 4
Class 2
All types
DIN
DIN 620
P0
P6
P5
P4
P2
All types
:    
AFBMA
 : Anti-friction Bearing Manufacturers Association
(ABEC-Ball Bearings, RBEC-Roller Bearings)
ANS : American National Standards Institute
ISO : International Organization for Standardization
JIS : Japanese Industrial Standards
DIN : Deutsch Industrie NormDeutsch Industrie Norm
: : :
 
Standard ABEC Tolerances Inner Rings (all tolerances in micrometers)
Bearing Bore(mm)
Bore Diameter*
+ .00mm to
Width
Variation
Radial Runouts
Side Runout with Bores
Raceway
Runout
with Side
Width Inner &
Outer Rings
ABEC Rating
1
3
5
7
9
3
5
7
9
1
3
5
7
9
3
5
7
9
3
5
7
9
1-3-
5-7
9
0 - 10
-3
-2
-2
-1.5
-1
3
2
1
.5
3
2
1.5
1
.5
3
3
1
.5
6
3
1
.5
-50
-10
10 - 18
-3
-2
-2
-1.5
-1
4
2
1
.5
4
3
1.5
1
.5
4
3
1
.5
6
3
1
.5
-50
-20
 
Standard ABEC Tolerances Outer Rings (all tolerances in micrometers)
Bearing O.D. (mm)
Outside Diameter*
+ .00mm to
Width Variation
Radial
Runout
Raceway Runout
with Side
Outside Diameter
Runout with Side
ABEC Rating
1
3
5
7
9
3
5
7
9
1
3
5
7
9
3
5
7
9
3
5
7
9
0 - 10
-4
-3
-2
-2
-1
4
2
1
5
6
4
2
1.5
.5
8
3
2
.5
4
3
1.5
.5
10 - 18
-4
-3
-2
-2
-1.5
4
2
1
.5
6
4
2
1.5
1
8
3
2
1
4
3
1.5
.5
 
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