The dimensional and running accuracy of SKF rolling bearings has been standardized internationally. In addition to the Normal tolerances, the ISO standards also cover closer tolerances, such as:
- tolerance class 6, which corresponds to SKF P6 tolerance class
- tolerance class 5, which corresponds to SKF P5 tolerance class
SKF bearing tolerance classes and the corresponding values for certain tolerance characteristics are specified in ISO 492 (for radial bearings) and ISO 199 (for thrust bearings). In 2014 these standards were aligned with general ISO GPS (Geometrical Product Specification) standards such as ISO 1101 and ISO 5459.
There are three common tolerance classes for SKF ball and roller bearings:
ISO tolerance class | SKF designation suffix | Description |
---|---|---|
Normal | – | Minimum standard for all SKF ball and roller bearings. |
Class 6 | P6 | Tighter tolerances than Normal. |
Class 5 | P5 | Tighter tolerances than class 6. |
For special applications like machine tool spindles, SKF also manufactures bearings with higher accuracy. These include the P4, P4A, PA9A, SP and UP tolerance classes.
For tolerance information about each bearing type, refer to Tolerances in the relevant product section. Bearings with higher accuracy than Normal are typically identified by a designation suffix for the tolerance class.
The tolerance symbols and their definitions are provided in Bearing tolerances symbols.
SKF bearing tolerance values
Actual SKF bearing tolerances values are listed in the following tables.
SKF metric radial bearings tolerances
Normal tolerances
Normal tolerances for SKF radial bearings, except tapered roller bearings
Inner ring
d | tΔdmp | tVdsp | tVdmp | tΔBs | tVBs | tKia | ||||||
Diameter series | All | Normal | Modified3) | |||||||||
> | ≤ | U | L | 7, 8, 92) | 0, 1 | 2, 3, 4 | U | L | L | |||
mm | μm | μm | μm | μm | μm | μm | ||||||
– | 2,5 | 0 | –8 | 10 | 8 | 6 | 6 | 0 | –40 | – | 12 | 10 |
2,5 | 10 | 0 | –8 | 10 | 8 | 6 | 6 | 0 | –120 | –250 | 15 | 10 |
10 | 18 | 0 | –8 | 10 | 8 | 6 | 6 | 0 | –120 | –250 | 20 | 10 |
18 | 30 | 0 | –10 | 13 | 10 | 8 | 8 | 0 | –120 | –250 | 20 | 13 |
30 | 50 | 0 | –12 | 15 | 12 | 9 | 9 | 0 | –120 | –250 | 20 | 15 |
50 | 80 | 0 | –15 | 19 | 19 | 11 | 11 | 0 | –150 | –380 | 25 | 20 |
80 | 120 | 0 | –20 | 25 | 25 | 15 | 15 | 0 | –200 | –380 | 25 | 25 |
120 | 180 | 0 | –25 | 31 | 31 | 19 | 19 | 0 | –250 | –500 | 30 | 30 |
180 | 250 | 0 | –30 | 38 | 38 | 23 | 23 | 0 | –300 | –500 | 30 | 40 |
250 | 315 | 0 | –35 | 44 | 44 | 26 | 26 | 0 | –350 | –500 | 35 | 50 |
315 | 400 | 0 | –40 | 50 | 50 | 30 | 30 | 0 | –400 | –630 | 40 | 60 |
400 | 500 | 0 | –45 | 56 | 56 | 34 | 34 | 0 | –450 | – | 50 | 65 |
500 | 630 | 0 | –50 | 63 | 63 | 38 | 38 | 0 | –500 | – | 60 | 70 |
630 | 800 | 0 | –75 | – | – | – | – | 0 | –750 | – | 70 | 80 |
800 | 1 000 | 0 | –100 | – | – | – | – | 0 | –1 000 | – | 80 | 90 |
1 000 | 1 250 | 0 | –125 | – | – | – | – | 0 | –1 250 | – | 100 | 100 |
1 250 | 1 600 | 0 | –160 | – | – | – | – | 0 | –1 600 | – | 120 | 120 |
1 600 | 2 000 | 0 | –200 | – | – | – | – | 0 | –2 000 | – | 140 | 140 |
Outer ring
D | tΔDmp | tVDsp | tVDmp | tΔCs | tKea | |||||
Open bearings Diameter series |
Capped bearings | tVCs | ||||||||
> | ≤ | U | L | 7, 8, 9 | 0, 1 | 2, 3, 4 | 2, 3, 4 | |||
mm | μm | μm | μm | μm | μm | |||||
2,5 | 18 | 0 | –8 | 10 | 8 | 6 | 10 | 6 |
Identical to tΔBs and tVBs of an inner ring of the same bearing as the outer ring |
15 |
18 | 30 | 0 | –9 | 12 | 9 | 7 | 12 | 7 | 15 | |
30 | 50 | 0 | –11 | 14 | 11 | 8 | 16 | 8 | 20 | |
50 | 80 | 0 | –13 | 16 | 13 | 10 | 20 | 10 | 25 | |
80 | 120 | 0 | –15 | 19 | 19 | 11 | 26 | 11 | 35 | |
120 | 150 | 0 | –18 | 23 | 23 | 14 | 30 | 14 | 40 | |
150 | 180 | 0 | –25 | 31 | 31 | 19 | 38 | 19 | 45 | |
180 | 250 | 0 | –30 | 38 | 38 | 23 | – | 23 | 50 | |
250 | 315 | 0 | –35 | 44 | 44 | 26 | – | 26 | 60 | |
315 | 400 | 0 | –40 | 50 | 50 | 30 | – | 30 | 70 | |
400 | 500 | 0 | –45 | 56 | 56 | 34 | – | 34 | 80 | |
500 | 630 | 0 | –50 | 63 | 63 | 38 | – | 38 | 100 | |
630 | 800 | 0 | –75 | 94 | 94 | 55 | – | 55 | 120 | |
800 | 1 000 | 0 | –100 | 125 | 125 | 75 | – | 75 | 140 | |
1 000 | 1 250 | 0 | –125 | – | – | – | – | – | 160 | |
1 250 | 1 600 | 0 | –160 | – | – | – | – | – | 190 | |
1 600 | 2 000 | 0 | –200 | – | – | – | – | – | 220 | |
2 000 | 2 500 | 0 | –250 | – | – | – | – | – | 250 |
P6 class tolerances
P6 class tolerances for SKF radial bearings, except tapered roller bearings
Inner ring
d | tΔdmp | tVdsp | tVdmp | tΔBs | tVBs | tKia | ||||||
Diameter series | All | Normal | Modified3) | |||||||||
> | ≤ | U | L | 7, 8, 92) | 0, 1 | 2, 3, 4 | U | L | L | |||
mm | μm | μm | μm | μm | μm | μm | ||||||
– | 2,5 | 0 | –7 | 9 | 7 | 5 | 5 | 0 | –40 | – | 12 | 5 |
2,5 | 10 | 0 | –7 | 9 | 7 | 5 | 5 | 0 | –120 | –250 | 15 | 6 |
10 | 18 | 0 | –7 | 9 | 7 | 5 | 5 | 0 | –120 | –250 | 20 | 7 |
18 | 30 | 0 | –8 | 10 | 8 | 6 | 6 | 0 | –120 | –250 | 20 | 8 |
30 | 50 | 0 | –10 | 13 | 10 | 8 | 8 | 0 | –120 | –250 | 20 | 10 |
50 | 80 | 0 | –12 | 15 | 15 | 9 | 9 | 0 | –150 | –380 | 25 | 10 |
80 | 120 | 0 | –15 | 19 | 19 | 11 | 11 | 0 | –200 | –380 | 25 | 13 |
120 | 180 | 0 | –18 | 23 | 23 | 14 | 14 | 0 | –250 | –500 | 30 | 18 |
180 | 250 | 0 | –22 | 28 | 28 | 17 | 17 | 0 | –300 | –500 | 30 | 20 |
250 | 315 | 0 | –25 | 31 | 31 | 19 | 19 | 0 | –350 | –500 | 35 | 25 |
315 | 400 | 0 | –30 | 38 | 38 | 23 | 23 | 0 | –400 | –630 | 40 | 30 |
400 | 500 | 0 | –35 | 44 | 44 | 26 | 26 | 0 | –450 | – | 45 | 35 |
500 | 630 | 0 | –40 | 50 | 50 | 30 | 30 | 0 | –500 | – | 50 | 40 |
630 | 800 | 0 | –50 | – | – | – | – | 0 | –750 | – | 60 | 45 |
800 | 1 000 | 0 | –60 | – | – | – | – | 0 | –1 000 | – | 60 | 50 |
1 000 | 1 250 | 0 | –75 | – | – | – | – | 0 | –1 250 | – | 70 | 60 |
1 250 | 1 600 | 0 | –90 | – | – | – | – | 0 | –1 600 | – | 70 | 70 |
1 600 | 2 000 | 0 | –115 | – | – | – | – | 0 | –2 000 | – | 80 | 80 |
Outer ring
D | tΔDmp | tVDsp | tVDmp | tΔCs | tKea | |||||||
Open bearings Diameter series |
Capped bearings5) | tVCs | ||||||||||
> | ≤ | U | L | 7, 8, 92) | 0, 1 | 2, 3, 4 | 0, 1, 2, 3, 4 | |||||
mm | μm | μm | μm | μm | μm | |||||||
2,5 | 18 | 0 | –7 | 9 | 7 | 5 | 9 | 5 |
Identical to tΔBs and tVBs of an inner ring of the same bearing as the outer ring |
8 | ||
18 | 30 | 0 | –8 | 10 | 8 | 6 | 10 | 6 | 9 | |||
30 | 50 | 0 | –9 | 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 | |||
120 | 150 | 0 | –15 | 19 | 19 | 11 | 25 | 11 | 20 | |||
150 | 180 | 0 | –18 | 23 | 23 | 14 | 30 | 14 | 23 | |||
180 | 250 | 0 | –20 | 25 | 25 | 15 | – | 15 | 25 | |||
250 | 315 | 0 | –25 | 31 | 31 | 19 | – | 19 | 30 | |||
315 | 400 | 0 | –28 | 35 | 35 | 21 | – | 21 | 35 | |||
400 | 500 | 0 | –33 | 41 | 41 | 25 | – | 25 | 40 | |||
500 | 630 | 0 | –38 | 48 | 48 | 29 | – | 29 | 50 | |||
630 | 800 | 0 | –45 | 56 | 56 | 34 | – | 34 | 60 | |||
800 | 1 000 | 0 | –60 | 75 | 75 | 45 | – | 45 | 75 | |||
1 000 | 1 250 | 0 | –75 | – | – | – | – | – | 85 | |||
1 250 | 1 600 | 0 | –90 | – | – | – | – | – | 100 | |||
1 600 | 2 000 | 0 | –115 | – | – | – | – | – | 100 | |||
2 000 | 2 500 | 0 | –135 | – | – | – | – | – | 120 |
P5 class tolerances
P5 class tolerances for SKF radial bearings, except tapered roller bearings
Inner ring
d | tΔdmp | tVdsp | tVdmp | tΔBs | tVBs | tKia | tSd | tSia | |||||
Diameter series | |||||||||||||
7, 8, 92) | 0, 1, 2, 3, 4 | All | Normal | Modified4) | |||||||||
> | ≤ | U | L | U | L | L | |||||||
mm | μm | μm | μm | μm | μm | μm | μm | μm | |||||
– | 2,5 | 0 | –5 | 5 | 4 | 3 | 0 | –40 | –250 | 5 | 4 | 7 | 7 |
2,5 | 10 | 0 | –5 | 5 | 4 | 3 | 0 | –40 | –250 | 5 | 4 | 7 | 7 |
10 | 18 | 0 | –5 | 5 | 4 | 3 | 0 | –80 | –250 | 5 | 4 | 7 | 7 |
18 | 30 | 0 | –6 | 6 | 5 | 3 | 0 | –120 | –250 | 5 | 4 | 8 | 8 |
30 | 50 | 0 | –8 | 8 | 6 | 4 | 0 | –120 | –250 | 5 | 5 | 8 | 8 |
50 | 80 | 0 | –9 | 9 | 7 | 5 | 0 | –150 | –250 | 6 | 5 | 8 | 8 |
80 | 120 | 0 | –10 | 10 | 8 | 5 | 0 | –200 | –380 | 7 | 6 | 9 | 9 |
120 | 180 | 0 | –13 | 13 | 10 | 7 | 0 | –250 | –380 | 8 | 8 | 10 | 10 |
180 | 250 | 0 | –15 | 15 | 12 | 8 | 0 | –300 | –500 | 10 | 10 | 11 | 13 |
250 | 315 | 0 | –18 | 18 | 14 | 9 | 0 | –350 | –500 | 13 | 13 | 13 | 15 |
315 | 400 | 0 | –23 | 23 | 18 | 12 | 0 | –400 | –630 | 15 | 15 | 15 | 20 |
400 | 500 | 0 | –28 | 28 | 21 | 14 | 0 | –450 | – | 18 | 17 | 18 | 23 |
500 | 630 | 0 | –35 | 35 | 26 | 18 | 0 | –500 | – | 20 | 19 | 20 | 25 |
630 | 800 | 0 | –45 | – | – | – | 0 | –750 | – | 26 | 22 | 26 | 30 |
800 | 1 000 | 0 | –60 | – | – | – | 0 | –1 000 | – | 32 | 26 | 32 | 30 |
1 000 | 1 250 | 0 | –75 | – | – | – | 0 | –1 250 | – | 38 | 30 | 38 | 30 |
1 250 | 1 600 | 0 | –90 | – | – | – | 0 | –1 600 | – | 45 | 35 | 45 | 30 |
1 600 | 2 000 | 0 | –115 | – | – | – | 0 | –2 000 | – | 55 | 40 | 55 | 30 |
Outer ring
D | tΔDmp | tVDsp | tVDmp | tΔCs | tVCs | tKea | tSD | tSea | ||||
Diameter series | ||||||||||||
> | ≤ | U | L | 7, 8, 92) | 0, 1, 2, 3, 4 | |||||||
mm | μm | μm | μm | μm | μm | μm | μm | μm | ||||
2,5 | 18 | 0 | –5 | 5 | 4 | 3 |
Identical to tΔBsof an inner ring of the same bearing as the outer ring |
5 | 5 | 4 | 8 | |
18 | 30 | 0 | –6 | 6 | 5 | 3 | 5 | 6 | 4 | 8 | ||
30 | 50 | 0 | –7 | 7 | 5 | 4 | 5 | 7 | 4 | 8 | ||
50 | 80 | 0 | –9 | 9 | 7 | 5 | 6 | 8 | 4 | 10 | ||
80 | 120 | 0 | –10 | 10 | 8 | 5 | 8 | 10 | 4,5 | 11 | ||
120 | 150 | 0 | –11 | 11 | 8 | 6 | 8 | 11 | 5 | 13 | ||
150 | 180 | 0 | –13 | 13 | 10 | 7 | 8 | 13 | 5 | 14 | ||
180 | 250 | 0 | –15 | 15 | 11 | 8 | 10 | 15 | 5,5 | 15 | ||
250 | 315 | 0 | –18 | 18 | 14 | 9 | 11 | 18 | 6,5 | 18 | ||
315 | 400 | 0 | –20 | 20 | 15 | 10 | 13 | 20 | 6,5 | 20 | ||
400 | 500 | 0 | –23 | 23 | 17 | 12 | 15 | 23 | 7,5 | 23 | ||
500 | 630 | 0 | –28 | 28 | 21 | 14 | 18 | 25 | 9 | 25 | ||
630 | 800 | 0 | –35 | 35 | 26 | 18 | 20 | 30 | 10 | 30 | ||
800 | 1 000 | 0 | –50 | 50 | 29 | 25 | 25 | 35 | 12,5 | – | ||
1 000 | 1 250 | 0 | –63 | – | – | – | 30 | 40 | 15 | – | ||
1 250 | 1 600 | 0 | –80 | – | – | – | 35 | 45 | 17,5 | – | ||
1 600 | 2 000 | 0 | –100 | – | – | – | 38 | 55 | 20 | – | ||
2 000 | 2 500 | 0 | –125 | – | – | – | 45 | 65 | 25 | – |
SKF metric tapered roller bearings tolerances
Normal and CL7C class tolerances
Normal and CL7C class tolerances for SKF metric tapered roller bearings
Inner ring, bearing width and ring widths
d | tΔdmp | tVdsp | tVdmp | tΔBs | tKia | tΔTs | tΔT1s | tΔT2s | |||||||
Tolerance classes | |||||||||||||||
Normal | CL7C1) | ||||||||||||||
> | ≤ | U | L | U | L | U | L | U | L | U | L | ||||
mm | μm | μm | μm | μm | μm | μm | μm | μm | |||||||
10 | 18 | 0 | –12 | 12 | 9 | 0 | –120 | 15 | 7 | +200 | 0 | +100 | 0 | +100 | 0 |
18 | 30 | 0 | –12 | 12 | 9 | 0 | –120 | 18 | 8 | +200 | 0 | +100 | 0 | +100 | 0 |
30 | 50 | 0 | –12 | 12 | 9 | 0 | –120 | 20 | 10 | +200 | 0 | +100 | 0 | +100 | 0 |
50 | 80 | 0 | –15 | 15 | 11 | 0 | –150 | 25 | 10 | +200 | 0 | +100 | 0 | +100 | 0 |
80 | 120 | 0 | –20 | 20 | 15 | 0 | –200 | 30 | 13 | +200 | –200 | +100 | –100 | +100 | –100 |
120 | 180 | 0 | –25 | 25 | 19 | 0 | –250 | 35 | – | +350 | –250 | +150 | –150 | +200 | –100 |
180 | 250 | 0 | –30 | 30 | 23 | 0 | –300 | 50 | – | +350 | –250 | +150 | –150 | +200 | –100 |
250 | 315 | 0 | –35 | 35 | 26 | 0 | –350 | 60 | – | +350 | –250 | +150 | –150 | +200 | –100 |
315 | 400 | 0 | –40 | 40 | 30 | 0 | –400 | 70 | – | +400 | –400 | +200 | –200 | +200 | –200 |
Outer ring
D | tΔDmp | tVDsp | tVDmp | tΔCs | tKea | ||||
Tolerance classes | |||||||||
Normal | CL7C1) | ||||||||
> | ≤ | U | L | U | L | ||||
mm | μm | μm | μm | μm | μm | ||||
18 | 30 | 0 | –12 | 12 | 9 | 0 | –120 | 18 | 9 |
30 | 50 | 0 | –14 | 14 | 11 | 0 | –120 | 20 | 10 |
50 | 80 | 0 | –16 | 16 | 12 | 0 | –150 | 25 | 13 |
80 | 120 | 0 | –18 | 18 | 14 | 0 | –200 | 35 | 18 |
120 | 150 | 0 | –20 | 20 | 15 | 0 | –250 | 40 | 20 |
150 | 180 | 0 | –25 | 25 | 19 | 0 | –250 | 45 | 23 |
180 | 250 | 0 | –30 | 30 | 23 | 0 | –300 | 50 | – |
250 | 315 | 0 | –35 | 35 | 26 | 0 | –350 | 60 | – |
315 | 400 | 0 | –40 | 40 | 30 | 0 | –400 | 70 | – |
400 | 500 | 0 | –45 | 45 | 34 | 0 | –450 | 80 | – |
500 | 630 | 0 | –50 | 60 | 38 | 0 | –500 | 100 | – |
630 | 800 | 0 | –75 | 80 | 55 | 0 | –750 | 120 | – |
CLN class tolerances
CLN class tolerances for SKF metric tapered roller bearings. Tolerance class CLN is in accordance with ISO tolerance class 6X.
Inner ring, bearing width and ring widths
d | tΔdmp | tVdsp | tVdmp | tΔBs | tKia | tΔTs | tΔT1s | tΔT2s | ||||||
> | ≤ | U | L | U | L | U | L | U | L | U | L | |||
mm | μm | μm | μm | μm | μm | μm | μm | μm | ||||||
10 | 18 | 0 | –12 | 12 | 9 | 0 | –50 | 15 | +100 | 0 | +50 | 0 | +50 | 0 |
18 | 30 | 0 | –12 | 12 | 9 | 0 | –50 | 18 | +100 | 0 | +50 | 0 | +50 | 0 |
30 | 50 | 0 | –12 | 12 | 9 | 0 | –50 | 20 | +100 | 0 | +50 | 0 | +50 | 0 |
50 | 80 | 0 | –15 | 15 | 11 | 0 | –50 | 25 | +100 | 0 | +50 | 0 | +50 | 0 |
80 | 120 | 0 | –20 | 20 | 15 | 0 | –50 | 30 | +100 | 0 | +50 | 0 | +50 | 0 |
120 | 180 | 0 | –25 | 25 | 19 | 0 | –50 | 35 | +150 | 0 | +50 | 0 | +100 | 0 |
180 | 250 | 0 | –30 | 30 | 23 | 0 | –50 | 50 | +150 | 0 | +50 | 0 | +100 | 0 |
250 | 315 | 0 | –35 | 35 | 26 | 0 | –50 | 60 | +200 | 0 | +100 | 0 | +100 | 0 |
315 | 400 | 0 | –40 | 40 | 30 | 0 | –50 | 70 | +200 | 0 | +100 | 0 | +100 | 0 |
Outer ring
D | tΔDmp | tVDsp | tVDmp | tΔCs | tKea | |||
> | ≤ | U | L | U | L | |||
mm | μm | μm | μm | μm | μm | |||
18 | 30 | 0 | –12 | 12 | 9 | 0 | -100 | 18 |
30 | 50 | 0 | –14 | 14 | 11 | 0 | -100 | 20 |
50 | 80 | 0 | –16 | 16 | 12 | 0 | -100 | 25 |
80 | 120 | 0 | –18 | 18 | 14 | 0 | -100 | 35 |
120 | 150 | 0 | –20 | 20 | 15 | 0 | -100 | 40 |
150 | 180 | 0 | –25 | 25 | 19 | 0 | -100 | 45 |
180 | 250 | 0 | –30 | 30 | 23 | 0 | -100 | 50 |
250 | 315 | 0 | –35 | 35 | 26 | 0 | -100 | 60 |
315 | 400 | 0 | –40 | 40 | 30 | 0 | -100 | 70 |
400 | 500 | 0 | –45 | 45 | 34 | 0 | -100 | 80 |
500 | 630 | 0 | –50 | 60 | 38 | 0 | -100 | 100 |
P5 class tolerances
P5 class tolerances for SKF metric tapered roller bearings
Inner ring and bearing width
d | tΔdmp | tVdsp | tVdmp | tΔBs | tKia | tSd | tΔTs | tΔT1s | tΔT2s | ||||||
> | ≤ | U | L | U | L | U | L | U | L | U | L | ||||
mm | μm | μm | μm | μm | μm | μm | μm | μm | μm | ||||||
10 | 18 | 0 | –7 | 5 | 5 | 0 | –200 | 5 | 7 | +200 | –200 | +100 | –100 | +100 | –100 |
18 | 30 | 0 | –8 | 6 | 5 | 0 | –200 | 5 | 8 | +200 | –200 | +100 | –100 | +100 | –100 |
30 | 50 | 0 | –10 | 8 | 5 | 0 | –240 | 6 | 8 | +200 | –200 | +100 | –100 | +100 | –100 |
50 | 80 | 0 | –12 | 9 | 6 | 0 | –300 | 7 | 8 | +200 | –200 | +100 | –100 | +100 | –100 |
80 | 120 | 0 | –15 | 11 | 8 | 0 | –400 | 8 | 9 | +200 | –200 | +100 | –100 | +100 | –100 |
120 | 180 | 0 | –18 | 14 | 9 | 0 | –500 | 11 | 10 | +350 | –250 | +150 | –150 | +200 | –100 |
180 | 250 | 0 | –22 | 17 | 11 | 0 | –600 | 13 | 11 | +350 | –250 | +150 | –150 | +200 | –100 |
250 | 315 | 0 | –25 | 19 | 13 | 0 | –700 | 13 | 13 | +350 | –250 | +150 | –150 | +200 | –100 |
315 | 400 | 0 | –30 | 23 | 15 | 0 | –800 | 15 | 15 | +400 | –400 | +200 | –200 | +200 | –200 |
400 | 500 | 0 | -35 | 28 | 17 | 0 | -900 | 20 | 17 | +450 | -450 | +225 | -225 | +225 | -225 |
500 | 630 | 0 |
-40 |
35 | 20 | 0 | -1 100 | 25 | 20 | +500 | -500 | – | – | – | – |
630 | 800 | 0 | -50 | 45 | 25 | 0 | -1 600 | 30 | 25 | +600 | -600 | – | – | – | – |
800 | 1 000 | 0 | -60 | 60 | 30 | 0 | -2 000 | 37 | 30 | +750 | -750 | – | – | – | – |
1 000 | 1 250 | 0 | -75 | 75 | 37 | 0 | -2 000 | 45 | 40 | +750 | -750 | – | – | – | – |
1 250 | 1 600 | 0 | -90 | 90 | 45 | 0 | -2 000 | 55 | 50 | +900 | -900 | – | – | – | – |
Outer ring
D | tΔDmp | tVDsp | tVDmp | tΔCs | tKea | tSD1) | |||||||||
> | ≤ | U | L | ||||||||||||
mm | μm | μm | μm | μm | μm | ||||||||||
18 | 30 | 0 | –8 | 6 | 5 |
Identical to tΔBs of an inner ring of the same bearing as the outer ring |
6 | 4 | |||||||
30 | 50 | 0 | –9 | 7 | 5 | 7 | 4 | ||||||||
50 | 80 | 0 | –11 | 8 | 6 | 8 | 4 | ||||||||
80 | 120 | 0 | –13 | 10 | 7 | 10 | 4,5 | ||||||||
120 | 150 | 0 | –15 | 11 | 8 | 11 | 5 | ||||||||
150 | 180 | 0 | –18 | 14 | 9 | 13 | 5 | ||||||||
180 | 250 | 0 | –20 | 15 | 10 | 15 | 5,5 | ||||||||
250 | 315 | 0 | –25 | 19 | 13 | 18 | 6,5 | ||||||||
315 | 400 | 0 | –28 | 22 | 14 | 20 | 6,5 | ||||||||
400 | 500 | 0 | –33 | 26 | 17 | 24 | 8,5 | ||||||||
500 | 630 | 0 | –38 | 30 | 20 | 30 | 10 | ||||||||
630 | 800 | 0 | -45 | 38 | 25 | 36 | 12,5 | ||||||||
800 | 1 000 | 0 | -60 | 50 | 30 | 43 | 15 | ||||||||
1 000 | 1 250 | 0 | -80 | 65 | 38 | 52 | 19 | ||||||||
1 250 | 1 600 | 0 | -100 | 90 | 50 | 62 | 25 | ||||||||
1 600 | 2 000 | 0 | -125 | 120 | 65 | 73 | 32,5 |
SKF inch radial bearings tolerances, except tapered roller bearings:
Normal tolerances
Normal tolerances for SKF inch radial bearings, except tapered roller bearings
Inner ring
d | tΔdmp | tVdsp | tΔBs | tVBs | tKia | tSia | |||
> | ≤ | U | L | U | L | ||||
mm | μm | μm | μm | μm | μm | μm | |||
– | 25,4 | +5 | –5 | 10 | 0 | –127 | 13 | 10 | 15 |
25,4 | 50,8 | +5 | –8 | 10 | 0 | –127 | 13 | 10 | 20 |
50,8 | 76,2 | +5 | –8 | 13 | 0 | –127 | 13 | 15 | 30 |
76,2 | 152,4 | +5 | –8 | 18 | 0 | –127 | 15 | 20 | 38 |
152,4 | 203,2 | +5 | –13 | 33 | 0 | –127 | 15 | 25 | 51 |
203,2 | 304,8 | +5 | –13 | 33 | 0 | –254 | 20 | 30 | 51 |
304,8 | 381 | +5 | –20 | 51 | 0 | –406 | 25 | 38 | 64 |
Outer ring
D | tΔDmp | tVDsp | tΔCs | tVCs | tKea | tSea | |||
> | ≤ | U | L | ||||||
mm | μm | μm | μm | μm | μm | μm | |||
– | 25,4 | –8 | –18 | 10 |
Identical to tΔBs of an inner ring of the same bearing as the outer ring |
13 | 10 | 15 | |
25,4 | 50,8 | –8 | –20 | 10 | 13 | 13 | 15 | ||
50,8 | 76,2 | –13 | –25 | 13 | 13 | 15 | 20 | ||
76,2 | 127 | –20 | –33 | 18 | 15 | 18 | 30 | ||
127 | 203,2 | –33 | –46 | 33 | 15 | 20 | 38 | ||
203,2 | 304,8 | –33 | –46 | 33 | 20 | 25 | 51 | ||
304,8 | 381 | –33 | –58 | 51 | 25 | 30 | 51 | ||
381 | 508 | –33 | –58 | 51 | 30 | 38 | 64 |
SKF inch tapered roller bearings
Normal, CL2, CL3 and CL0 class tolerances
Tolerances for SKF inch tapered roller bearings
Inner ring
d | tΔdmp | tKia, tSia | ||||||||
Tolerance classes | ||||||||||
Normal, CL2 | CL3, CL0 | |||||||||
> | ≤ | U | L | U | L | |||||
mm | μm | μm | ||||||||
– | 76,2 | +13 | 0 | +13 | 0 |
Values are given in outer ring table |
||||
76,2 | 101,6 | +25 | 0 | +13 | 0 | |||||
101,6 | 266,7 | +25 | 0 | +13 | 0 | |||||
266,7 | 304,8 | +25 | 0 | +13 | 0 | |||||
304,8 | 609,6 | +51 | 0 | +25 | 0 | |||||
609,6 | 914,4 | +76 | 0 | +38 | 0 |
Outer ring
D | tΔDmp | tKia, tKea, tSia, tSea | tKea | |||||||
Tolerance classes | Tolerance classes | Tolerance class | ||||||||
Normal, CL2 | CL3, CL0 | Normal | CL2 | CL3 | CL0 | CL7C | ||||
> | ≤ | H | L | H | L | |||||
mm | μm | μm | μm | |||||||
– | 304,8 | +25 | 0 | +13 | 0 | 51 | 38 | 8 | 4 | |
304,8 | 609,6 | +51 | 0 | +25 | 0 | 51 | 38 | 18 | 9 | |
609,6 | 914,4 | +76 | 0 | +38 | 0 | 76 | 51 | 51 | 26 |
Abutment width of single row bearing
d | D | tΔTs | |||||||
Tolerance classes | |||||||||
Normal | CL2 | CL3, CL0 | |||||||
> | ≤ | > | ≤ | U | L | U | L | U | L |
mm | mm | μm | μm | μm | |||||
– | 101,6 | – | – | +203 | 0 | +203 | 0 | +203 | –203 |
101,6 | 266,7 | – | – | +356 | –254 | +203 | 0 | +203 | –203 |
266,7 | 304,8 | – | – | +356 | –254 | +203 | 0 | +203 | –203 |
304,8 | 609,6 | – | 508 | +381 | –381 | +381 | –381 | +203 | –203 |
304,8 | 609,6 | 508 | – | +381 | –381 | +381 | –381 | +381 | –381 |
609,6 | – | – | – | +381 | –381 | – | – | +381 | –381 |
SKF thrust bearings tolerances
Normal, P6 and P5 class tolerances
Tolerances for SKF thrust bearings
Nominal diameter |
Shaft washer | Housing washer | |||||||||||||
Tolerance classes | Tolerance classes | Tolerance classes | |||||||||||||
d, d2, D1) | Normal, P6, P5 | Normal | P6 | P5 | Normal, P6, P5 | ||||||||||
tΔdmp, tΔd2mp | tVdsp, tVd2sp | tSi | tSi | tSi | tΔDmp | tVDsp | tSe | ||||||||
> | ≤ | U | L | U | L | ||||||||||
mm | μm | μm | μm | μm | μm | μm | μm | ||||||||
– | 18 | 0 | –8 | 6 | 10 | 5 | 3 | 0 | –11 | 8 |
Identical to tSi of shaft washer of same bearing |
||||
18 | 30 | 0 | –10 | 8 | 10 | 5 | 3 | 0 | –13 | 10 | |||||
30 | 50 | 0 | –12 | 9 | 10 | 6 | 3 | 0 | –16 | 12 | |||||
50 | 80 | 0 | –15 | 11 | 10 | 7 | 4 | 0 | –19 | 14 | |||||
80 | 120 | 0 | –20 | 15 | 15 | 8 | 4 | 0 | –22 | 17 | |||||
120 | 180 | 0 | –25 | 19 | 15 | 9 | 5 | 0 | –25 | 19 | |||||
180 | 250 | 0 | –30 | 23 | 20 | 10 | 5 | 0 | –30 | 23 | |||||
250 | 315 | 0 | –35 | 26 | 25 | 13 | 7 | 0 | –35 | 26 | |||||
315 | 400 | 0 | –40 | 30 | 30 | 15 | 7 | 0 | –40 | 30 | |||||
400 | 500 | 0 | –45 | 34 | 30 | 18 | 9 | 0 | –45 | 34 | |||||
500 | 630 | 0 | –50 | 38 | 35 | 21 | 11 | 0 | –50 | 38 | |||||
630 | 800 | 0 | –75 | 55 | 40 | 25 | 13 | 0 | –75 | 55 | |||||
800 | 1 000 | 0 | –100 | 75 | 45 | 30 | 15 | 0 | –100 | 75 | |||||
1 000 | 1 250 | 0 | –125 | 95 | 50 | 35 | 18 | 0 | –125 | 95 | |||||
1 250 | 1 600 | 0 | –160 | 120 | 60 | 40 | 25 | 0 | –160 | 120 | |||||
1 600 | 2 000 | 0 | –200 | 150 | 75 | 45 | 30 | 0 | –200 | 150 | |||||
2 000 | 2 500 | 0 | –250 | 190 | 90 | 50 | 40 | 0 | –250 | 190 |
Bearing height
d, d21) | tΔTs | tΔT1s | tΔT1s | tΔT3s | tΔT4s | ||||||||
Single direction bearings without seat washer |
Single direction bearings with seat washer |
Double direction bearings without seat washers |
Double direction bearings with seat washers |
Spherical roller thrust bearings |
|||||||||
SKF | SKF Explorer | ||||||||||||
> | ≤ | U | L | U | L | U | L | U | L | U | L | U | L |
mm | μm | μm | μm | μm | μm | ||||||||
– | 30 | +20 | –250 | +100 | –250 | +150 | –400 | +300 | –400 | – | – | – | – |
30 | 50 | +20 | –250 | +100 | –250 | +150 | –400 | +300 | –400 | – | – | – | – |
50 | 80 | +20 | –300 | +100 | –300 | +150 | –500 | +300 | –500 | 0 | –125 | 0 | –100 |
80 | 120 | +25 | –300 | +150 | –300 | +200 | –500 | +400 | –500 | 0 | –150 | 0 | –100 |
120 | 180 | +25 | –400 | +150 | –400 | +200 | –600 | +400 | –600 | 0 | –175 | 0 | –125 |
180 | 250 | +30 | –400 | +150 | –400 | +250 | –600 | +500 | –600 | 0 | –200 | 0 | –125 |
250 | 315 | +40 | –400 | – | – | – | – | – | – | 0 | –225 | 0 | –150 |
315 | 400 | +40 | –500 | – | – | – | – | – | – | 0 | –300 | 0 | –200 |
400 | 500 | +50 | –500 | – | – | – | – | – | – | 0 | –400 | – | – |
500 | 630 | +60 | –600 | – | – | – | – | – | – | 0 | –500 | – | – |
630 | 800 | +70 | –750 | – | – | – | – | – | – | 0 | –630 | – | – |
800 | 1 000 | +80 | –1 000 | – | – | – | – | – | – | 0 | –800 | – | – |
1 000 | 1 250 | +100 | –1 400 | – | – | – | – | – | – | 0 | –1 000 | – | – |
1 250 | 1 600 | +120 | –1 600 | – | – | – | – | – | – | 0 | –1 200 | – | – |
1 600 | 2 000 | +140 | –1 900 | – | – | – | – | – | – | – | – | – | – |
2 000 | 2 500 | +160 | –2 300 | – | – | – | – | – | – | – | – | – | – |
SKF tapered bore bearings tolerances, taper 1:12
Normal, P6 and P5 class tolerances
Normal, P6 and P5 class tolerances for SKF tapered bores bearings, taper 1:12
Bore diameter | Tolerance classes | ||||||||||
Normal, P6 | P5 | ||||||||||
d | tΔdmp | tVdsp | tΔSL | tΔdmp | tVdsp | tΔSL | |||||
> | ≤ | U | L | U | L | U | L | U | L | ||
mm | μm | μm | μm | μm | μm | μm | |||||
18 | 30 | +21 | 0 | 13 | +21 | 0 | +13 | 0 | 13 | +13 | 0 |
30 | 50 | +25 | 0 | 15 | +25 | 0 | +16 | 0 | 15 | +16 | 0 |
50 | 80 | +30 | 0 | 19 | +30 | 0 | +19 | 0 | 19 | +19 | 0 |
80 | 120 | +35 | 0 | 22 | +35 | 0 | +22 | 0 | 22 | +22 | 0 |
120 | 180 | +40 | 0 | 31 | +40 | 0 | +25 | 0 | 25 | +25 | 0 |
180 | 250 | +46 | 0 | 38 | +46 | 0 | +29 | 0 | 29 | +29 | 0 |
250 | 315 | +52 | 0 | 44 | +52 | 0 | +32 | 0 | 32 | +32 | 0 |
315 | 400 | +57 | 0 | 50 | +57 | 0 | +36 | 0 | 36 | +36 | 0 |
400 | 500 | +63 | 0 | 56 | +63 | 0 | +40 | 0 | – | +40 | 0 |
500 | 630 | +70 | 0 | 70 | +70 | 0 | +44 | 0 | – | +44 | 0 |
630 | 800 | +80 | 0 | – | +80 | 0 | +50 | 0 | – | +50 | 0 |
800 | 1 000 | +90 | 0 | – | +90 | 0 | +56 | 0 | – | +56 | 0 |
1 000 | 1 250 | +105 | 0 | – | +105 | 0 | +66 | 0 | – | +66 | 0 |
1 250 | 1 600 | +125 | 0 | – | +125 | 0 | +78 | 0 | – | +78 | 0 |
1 600 | 2 000 | +150 | 0 | – | +150 | 0 | +92 | 0 | – | +92 | 0 |
SKF tapered bore bearings tolerances, taper 1:30
Normal tolerances
Bore diameter | Tolerance class | ||||||||||
Normal | |||||||||||
d | tΔdmp | tVdsp1) | tΔSL | ||||||||
> | ≤ | U | L | U | L | ||||||
mm | μm | μm | μm | ||||||||
– | 80 | +15 | 0 | 19 | +30 | 0 | |||||
80 | 120 | +20 | 0 | 22 | +35 | 0 | |||||
120 | 180 | +25 | 0 | 40 | +40 | 0 | |||||
180 | 250 | +30 | 0 | 46 | +46 | 0 | |||||
250 | 315 | +35 | 0 | 52 | +52 | 0 | |||||
315 | 400 | +40 | 0 | 57 | +57 | 0 | |||||
400 | 500 | +45 | 0 | 63 | +63 | 0 | |||||
500 | 630 | +50 | 0 | 70 | +70 | 0 | |||||
630 | 800 | +75 | 0 | – | +100 | 0 | |||||
800 | 1 000 | +100 | 0 | – | +100 | 0 | |||||
1 000 | 1 250 | +125 | 0 | – | +115 | 0 | |||||
1 250 | 1 600 | +160 | 0 | – | +125 | 0 | |||||
1 600 | 2 000 | +200 | 0 | – | +150 | 0 |
SKF bearing tolerance symbols
The tolerance symbols that we use are in line with ISO 492 and ISO 199 and are explained in the tables as follows. The symbols normally refer to dimensional tolerances, only Kia, Kea, Sd, SD, Sia and Sea refer to geometrical tolerances.
Tolerance symbol |
Definition |
Radial bearings inner ring - cylindrical and tapered bore | |
d |
|
Δdmp |
|
Δds | Deviation of a two-point size of bore diameter of a cylindrical bore from its nominal size |
Vdsp | Range of two-point sizes of bore diameter in any cross section of a cylindrical or tapered bore |
Vdmp | Range of mid-range sizes (out of two-point sizes) of bore diameter obtained from any cross section of a cylindrical bore |
B | Nominal inner ring width |
ΔBs Normal, Modified1) |
|
VBs |
|
Kia4) | Circular radial run-out of inner ring bore surface of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface |
Sd4) |
Circular axial run-out of inner ring face with respect to datum, i.e. axis, established from the inner ring bore surface |
Sia4) | Circular axial run-out of inner ring face of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface |
Radial bearings inner ring - tapered bore only | |
d1 | Nominal bore diameter at the theoretical large end of a tapered bore |
Δd1mp | Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical large end from its nominal size |
SL | Taper slope, the difference between nominal diameters at the theoretical large end and small end of a tapered bore (d1 - d) |
ΔSL | Deviation of taper slope of a tapered inner ring bore from its nominal size |
Radial bearings outer ring | |
D | Nominal outside diameter |
ΔDmp | Deviation of a mid-range size (out of two-point sizes) of outside diameter in any cross section from its nominal size |
ΔDs | Deviation of a two-point size of outside diameter from its nominal size |
VDsp | Range of two-point sizes of outside diameter in any cross section |
VDmp | Range of mid-range sizes (out of two-point sizes) of outside diameter obtained from any cross section |
C | Nominal outer ring width |
ΔCs Normal, Modified1) |
|
VCs |
|
Kea4) | Circular radial run-out of outer ring outside surface of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface |
SD4) | Perpendicularity of outer ring outside surface axis with respect to datum established from the outer ring face |
Sea4) | Circular axial run-out of outer ring face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface |
Chamfer limits | |
rs | Single chamfer dimension |
rs min | Smallest single chamfer dimension of rs, r1, r2, r3, r4 … |
r1, r3 | Radial direction chamfer dimensions |
r2, r4 | Axial direction chamfer dimensions |
Tapered roller bearings | |
T | Nominal assembled bearing width |
ΔTs | Deviation of minimum circumscribed size of assembled bearing width from its nominal size |
T1 | Nominal effective width of cone (inner ring, with roller and cage assembly) assembled with a master cup (outer ring) |
T2 | Nominal effective width of cup assembled with a master cone |
ΔT1s | Deviation of minimum circumscribed size of effective width (cone assembled with a master cup) from its nominal size |
ΔT2s | Deviation of minimum circumscribed size of effective width (cup assembled with a master cone) from its nominal size |
Thrust bearings shaft washer | |
d | Nominal bore diameter of shaft washer, single direction bearing |
Δds | Deviation of a two-point size of shaft washer bore diameter from its nominal size |
Δdmp | Deviation of a mid-range size (out of two-point sizes) of shaft washer bore diameter in any cross section from its nominal size |
Vdsp | Range of two-point sizes of shaft washer bore diameter in any cross section |
d2 | Nominal bore diameter of central shaft washer, double direction bearing |
Δd2mp | Deviation of a mid-range size (out of two-point sizes) of central shaft washer bore diameter in any cross section from its nominal size |
Vd2sp | Range of two-point sizes of central shaft washer bore diameter in any cross section |
Si |
|
Thrust bearings housing washer | |
D | Nominal outside diameter of housing washer |
ΔDs | Deviation of a two-point size of housing washer outside diameter from its nominal size |
ΔDmp | Deviation of a mid-range size (out of two-point sizes) of housing washer outside diameter in any cross section from its nominal size |
VDsp | Range of two-point sizes of housing washer outside diameter in any cross section |
Se |
|
Thrust bearings assembled bearing height | |
T | Nominal assembled bearing height, single direction thrust bearing (except spherical roller thrust bearing → T4) |
ΔTs | Deviation of minimum circumscribed size of assembled bearing height from its nominal size, single direction thrust bearing (except spherical roller thrust bearing → ΔT4s) |
T1 |
|
ΔT1s |
|
T32) | Nominal assembled bearing height, double direction thrust bearing with seat washers |
ΔT3s2) | Deviation of minimum circumscribed size of assembled bearing height from its nominal size, double direction thrust bearing with seat washers |
T43) | Nominal assembled bearing height, spherical roller thrust bearing |
ΔT4s3) | Deviation of minimum circumscribed size of assembled bearing height from its nominal size, spherical roller thrust bearing |
- 1) Modified applies to inner rings and outer rings of bearings of matched bearing sets consisting of two or more bearings. Does not apply to universally matchable angular contact ball bearings.
- 2) Not included in ISO 199.
- 3) In ISO 199, the symbol T is used.
- 4) Geometrical tolerances
The bore and outside diameter variation tolerances tVdsp and tVDsp for metric radial bearings vary depending on the diameter series to which the bearing belongs. To determine the diameter series, refer to SKF bearing designation.