Our Bearings / Technical Parameters / Tolerances

Tolerances

The tolerances of the boundary dimensions and rotational accuracy are defined in accordance with international standards:

  • DIN 620 and ISO 492 for metric bearings series 60XX and self-aligning bearings 12XX/13XX/22XX.
  • AFBMA for inch bearings series R.
  • BS292 for inch bearings series KLNJ and RLS.

WIB ball bearings are manufactured according to the tolerance class DIN P0, P6, P5, and P4 specifications. The precision class of the balls is grade 5 or better.

Certain applications call for special tolerancing to ensure optimal performance, which WIB is accustomed to accommodating. Dimensions that fall outside international standard will be identified with a PA designation, which appears in the descriptions and drawings. Special PA tolerances may be combined with standard tolerances when one or more tolerances are not referenced in the standards. These tolerances are shown on the bearing drawings as well. This is primarily used for bearings with profiles. For example: P0/PA

Tolerance Classes

DIN ISO AFBMA
PO Class 0 ABEC 1
P6 Class 6 ABEC 3
P5 Class 5 ABEC 5
P4 Class 4 ABEC 7
Tolerances for inner rings (IR) Bearings Bearings
mm inch
d Nominal bore diameter From To 3
18 		.118
.709
Tolerance values µ m µ inch
∆dmp
Single plane mean bore diameter deviation
 P0
P6
P5
P4 		max/min
0/-8
0/-7
0/-5
0/-4 		max/min
0/-3.2
0/-2.8
0/-2.0
0/-1.6
Vdp Bore diameter variation in a single radial plane Diameter series 7.8.9(618/28/38-xx, 619) P0
P6
P5
P4 		10
9
5
4 		4.0
3.5
2.0
1.6
Vdp Diameter series 0.1 (60,630,160-xx) P0
P6
P5
P4 		8
7
4
3 		4.0
3.5
2.0
1.6
Vdp Diameter series 2.3.4 (62x,620x,63x) P0
P6
P5
P4 		6
5
4
3 		2.4
2.0
1.6
1.2
Vdmp max Mean bore diameter variation (for basically cylindrical bores) P0
P6
P5
P4 		6
5
3
2 		2.4
2.0
1.2
0.8
d Nominal bore diameter From To 3
10 		> 10
18 		.118
.394 		> .394
.709
∆Bs Deviation of a single IR width P0
P6
P5
P4 		max/min
0/-120
0/-120
0/-40
0/-40 		max/min
0/-120
0/-120
0/-80
0/-80 		max/min
0/-47
0/-47
0/-16
0/-16
max/min
0/-47
0/-47
0/-32
0/-32
VBs max IR width variation P0
P6
P5
P4 		15
15
5
2.5 		20
20
5
2.5 		6
6
2
1 		8
8
2
1
Kia max Radial runout of assembled bearing IR P0
P6
P5
P4 		10
6
4
2.5 		10
7
4
2.5 		4.0
2.4
1.6
1.0 		4.0
2.8
1.6
1.0
Sd max IR reference face runout with bore P0
P6
P5
P4 		-
-
7
3 		-
-
7
3 		-
-
2.8
1.2 		-
-
2.8
1.2
Sia max Assembled bearing IR reference face runout with raceway P0
P6
P5
P4 		-
-
7
3 		-
-
7
3 		-
-
2.8
1.2 		-
-
2.8
1.2

The tolerance and rotational accuracy symbols according to the ISO 1132 standard are shown in the following table.

Tolerances for outer rings (OR) Bearings Bearings
mm inch
D
Nominal bore diameter 		From
To 		6
18 		>18
30 		>30
50 		.236
.709 		>.709
1.181 		> 1.181
1.969
Tolerance values µ m µ inch
∆Dmp Single radial plane mean outside diameter deviation P0
P6
P5
P4 		max/min
0/-8
0/-7
0/-5
0/-4 		max/min
0/-9
0/-8
0/-6
0/-5 		max/min
0/-11
0/-9
0/-7 		max/min
0/-3.2
0/-2.8
0/-2.0 		max/min
0/-3.5
0/-3.2
0/-2.4 		max/min
0/-4.3
0/-3.5
0/-2.8
VDp Outside diameter variation in a single radial plane Diameter series 7.8.9(618/28/38-xx, 619) P0
P6
P5
P4 		10
9
5
4 		12
10
6
5 		14
11
7
6 		4.0
3.5
2.0
1.6 		4.7
4.0
2.4
2.0 		5.5
4.3
2.8
2.4
VDp Diameter series 0.1 (60,630,160-xx) P0
P6
P5
P4 		8
7
4
3 		9
8
5
4 		11
9
5
5 		3.2
2.8
1.6
1.2 		3.5
3.2
2.0
1.6 		4.3
3.5
2.0
2.0
VDp Diameter series 2.3.4 (62x,620x,63x) P0
P6
P5
P4 		6
5
4
3 		7
6
5
4 		8
7
5
5 		2.4
2.0
1.6
1.2 		2.8
2.4
2.0
1.6 		3.2
2.8
2.0
2.0
VDp 2Z bearing Diameter series 0.1.2.3.4 P0
P6
P5
P4 		10
9
-
- 		12
10
-
- 		16
13
-
- 		4.0
3.5
-
- 		4.7
4.0
-
- 		6.3
5.1
-
-
VDmp max Mean outside diameter variation P0
P6
P5
P4 		6
5
3
2 		7
6
3
2.5 		8
7
4
3 		2.4
2.0
1.2
1.0 		2.8
2.4
1.2
1.0 		3.2
2.8
1.6
1.2
∆Cs Deviation of a single OR width P0
P6
P5
P4 		The width tolerances ∆Cs are identical to those of ∆Bs for the corresponding inner ring (IR)
VCs max OR width variation P0
P6
P5
P4 		The width tolerances VCs are identical to those of VBs for the corresponding inner ring (IR)
5
2.5 		5
2.5 		5
2.5 		2
1.0 		2
1.0 		2
1.0
Kea max Radial runout of assembled bearing OR P0
P6
P5
P4 		15
8
5
3 		15
9
6
4 		20
10
7
5 		6.0
3.2
2.0
1.2 		6.0
3.5
2.4
1.6 		8.0
4.0
2.8
2.0
SD max Variation of outside surface generatrix inclination with OR reference face P0
P6
P5
P4 		-
-
8
4 		-
-
8
4 		-
-
8
4 		-
-
3.2
1.6 		-
-
3.2
1.6 		-
-
3.2
1.6
Sea max Assembled bearing OR reference face runout with raceway P0
P6
P5
P4 		-
-
8
5 		-
-
8
5 		-
-
8
5 		-
-
3.2
2.0 		-
-
3.2
2.0 		-
-
3.2
2.0

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