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  Tolerance And Accuracy
According to dimension tolerances and run out accuracy, the deep groove ball bearings grades are as ABEC-1, ABEC-3, ABEC-5. ABEC-1 is standard grade,while ABEC-3 muchhigher and ABEC-5 the highest.
These tolerance grades corresponds to the precision which adopted by the international Standard Organization(ISO492). The corresponding grades as follows.
ABEC-1
NORMAL CLASS
ABEC-3
CLASS 6
ABEC-5
CLASS 5
SYMBOLS
The following symbols are used to identify boundary dimensions, size variations and runout errors.
d=Basic bore diameter
”÷dmp=Single plane mean bore diameter deviation in a single radial plane
Vdp=Bore diameter variation in a single radial
Vdmp=Mean bore diameter variation
D=Basic outside diameter
”÷Dmp=Single phane mean outside diameter deviation from basic
VDp=Outside diameter variation a single radial
VDmp=Mean outside diameter variation
B=Basic inner ring width
”÷Bs=Single inner ring width deviation from basic
VBs=inner ring width variation
C=Basic outer ring width
Cs=Single outer ring width deviation from basic
Vcs=Outer ring width variation
Kia=Radial runout of assembled bearing inner ring
Kea=Radial runout of assembled bearing outer ring
Sd=inner ring reference face runout with bore
SD=Outside cylindrical surface runout with outer ring reference face
Sia=Axial runout of assembled bearing inner ring
Sea=Axial runout of assembled bearing outer ring
INNER RING OF 0 GRADE TOLERANCE
  µm
d
mm
”÷dmp
Vdp2)
Vdmp
Kia
”÷Bs
Vbs
Diameter Series
9
0,1
2,3,4
over
incl.
high
low
max
max
max
high
low
max
0.61)
2.5
0
-8
10
8
6
6
10
0
-40
12
2.5
10
0
-8
10
8
6
6
10
0
-120
15
10
18
0
-8
10
8
6
6
10
0
-120
20
18
30
0
-10
13
10
8
8
13
0
-120
20
30
50
0
-12
15
12
9
9
15
0
-120
20
50
80
0
-15
19
13
11
11
20
0
-150
25
1) 0.6 is included
2£©No values for diameter series 7,8
OUTER RING OF 0 GRADE TOLERANCE
  µm
D
mm
”÷Dmp
VDp2)4)
VDMP4)
Kea
”÷Cs
Vcs
Open Bearings
Capped Bearings2)3)
Diameter Series
9
0,1
2,3,4
2,3,4
over
incl.
high
low
max
max
max
high
low
max
1)2.5
6
0
-8
10
19
6
10
6
15
ldentical to ”÷Bs and VBs of inner ring of same bearing.
6
18
0
-8
10
13
6
10
6
15
18
30
0
-8
12
11
7
12
7
15
30
50
0
-11
14
9
8
16
8
20
50
80
0
-13
16
8
10
20
10
25
80
120
0
-15
19
8
11
20
11
30
1) 2.5 is included
2£©No values for diameter series 7,8
3) No values for diameter series 9,0,1
INNER RING OF 6 GRADE TOLERANCE
  µm
d
mm
”÷dmp
Vdp2)
Vdmp
Kia
”÷Bs
VBs
Diameter Series
9
0,1
2,3,4
over
incl.
high
low
max
max
max
high
low
max
1)0.6
2.5
0
-7
9
7
5
5
5
0
-40
12
2.5
10
0
-7
9
7
5
5
6
0
-120
15
10
18
0
-7
9
7
5
5
7
0
-120
20
18
30
0
-8
10
8
6
6
8
0
-120
20
30
50
0
-10
13
10
8
8
10
0
-120
20
50
80
0
-12
15
15
9
9
10
0
-150
25
1) 0.6 is included
2£©No values for diameter series 7,8
OUTER RING OF 6 GRADE TOLERANCE
  µm
D
mm
”÷Dmp
VDp2)4)
VDmp4)
Kea
”÷Cs
Vcs
Open Bearings
Capped Bearings2)3)
Diameter Series
9
0,1
2,3,4
2,3,4
over
incl.
high
low
max
max
max
high
low
max
1)2.5
6
0
-7
9
7
5
9
5
8
ldentical to ”÷Bs and VBs of inner ring of same bearing.
6
18
0
-7
9
7
5
9
5
8
18
30
0
-8
10
8
6
10
6
9
30
50
0
19
11
9
7
13
7
10
50
80
0
-11
14
11
8
16
8
13
80
120
0
-13
16
16
10
20
10
18
1) 2.5 is included
2£©No values for diameter series 7,8
3) No values for diameter series 9,0,1
 
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