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Bearing Shaft and Housing Installation Tolerances
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Bearing Shaft and Housing Installation Tolerances
Size and fit tolerances for bearing mating shafts and housing are provided within the tables below are defined by ISO tolerances for shafts and housings (ISO 286) in conjunction with the tolerances Δdmp for the bore and ΔDmp for the outside diameter of the bearings per. (DIN 620).
The tables provided are design recommendation and should not supercede ABEC, ISO or OEM recommended fits and tolerances.
Tolerance zones amd variability
The ISO tolerances are defined in the form of tolerance zones. They are determined by their position relative to the zero line (= tolerance position) and their size (= tolerance grade, see ISO 286). The tolerance position is indicated by letters (upper case for housings, lower case for shafts). For a schematic representation of the most common rolling bearing fits.
The tables as below contain recommendations for the selection of shaft and housing tolerances that are valid for normal fitting and operating conditions.
Tolerance specification deviations are possible if particular requirements apply, for example in relation to running accuracy, smooth running or operating temperature. Increased running accuracies thus require closer tolerances such as tolerance grade 5 instead of 6. If the inner ring is warmer than the shaft during operation, the seating may loosen to an impermissible extent. A tighter fit must then be selected, for example m6 instead of k6.
In such cases, the question of fits can only be resolved by a compromise. The individual requirements must be weighed against each other and those fulfilled that give the best overall solution.
Related:
- Preferred Tolerances Metric ISO 286
- Table of Hole Bore Tolerances per. ISO 286 Calculator
- Table of Shaft Tolerances per. ISO 286 Calculator
Roller Bearing Fits and Tolerances Designations
(Click on image to enlarge)
- Zero line (Line-to-Line Fit)
- Nominal diameter
- Loose fit
- Transition fit
- Tight fit
- Shaft diameter
- Housing bore
ΔDmp = tolerance for bearing outside diameter
Δdmp = tolerance for bearing bore
Shaft tolerances for radial bearings with cylindrical bore
| Condition of rotation | Bearing type | Shaft diameter | Displacement facility Load | Tolerance zone |
| Point load on inner ring | Ball bearings, roller bearings | All sizes | Inner ring easily displaced | g6(g5) |
| Inner ring not easily displaced, angular contact ball bearings and tapered roller bearings with adjusted inner ring | h6(j6) | |||
| Needle roller bearings | All sizes | Non-locating bearing | h6(g6)1) | |
| Circumferential load on inner ring or indeterminate load direction | Ball bearings | up to50 | Normal loads2 | j6(j5) |
50to100 | Low loads3 | j6(j5) | ||
| Normal and high loads4) | k6(k5) | |||
100to200 | Low loads2 | k6(m6) | ||
| Normal and high loads5 | m6(m5) | |||
over200 | Low loads | m6(m5) | ||
| Normal and high loads | n6(n5) | |||
| Roller bearings | up to60 | Low loads | j6(j5) | |
| Normal and high loads | k6(k5) | |||
60to200 | Low loads | k6(k5) | ||
| Normal loads | m6(m5) | |||
| High loads | n6(n5) | |||
200to500 | Normal loads | m6(n6) | ||
| High loads, shocks | p6 | |||
over500 | Normal loads | n6(p6) | ||
| High loads | p6 | |||
| Needle roller bearings | up to50 | Low loads | k6 | |
| Normal and high loads | m6 | |||
50to120 | Low loads | m6 | ||
| Normal and high loads | n6 | |||
120to250 | Low loads | n6 | ||
| Normal and high loads | p6 | |||
250to400 | Low loads | p6 | ||
| Normal and high loads | r6 | |||
400to500 | Low loads | r6 | ||
| Normal and high loads | s6 | |||
over500 | Low loads | r6 | ||
| Normal and high loads | s6 |
- For easier fitting.
- C/P ＞ 10
- C/P ＞ 12
- C/P ＜ 12
- C/P ＜ 10
Shaft tolerances for axial bearings
| Load | Bearing type | Shaft diameter | Operating conditions | Tolerance zone |
| Axial load | Axial deep groove ball bearings | All sizes | - | j6 |
| Axial deep groove ball bearings, double direction | - | k6 | ||
| Axial cylindrical roller bearings with shaft locating washer | - | h6(j6) | ||
| Axial cylindrical roller and cage assemblies | - | h8 | ||
| Combined load | Axial spherical roller bearings | All sizes | Point load on shaft locating washer | j6 |
up to200mm | Circumferential load on shaft locating washer | j6(k6) | ||
over200mm | k6(m6) |
Housing tolerances radial bearings
| Condition of rotation | Displacement facility Load | Operating conditions | Tolerance zone |
| Point load on outer ring | Outer ring easily displaced, housing un split | The tolerance grade is determined by the running accuracy required | H7(H6)1) |
| Outer ring easily displaced, housing split | H8(H7) | ||
| Outer ring not easily displaced, housing un split | High running accuracy required | H6(J6) | |
| Outer ring not easily displaced, angular contact ball bearings and tapered roller bearings with adjusted outer ring Housing split | Normal running accuracy | H7(J7) | |
| Outer ring easily displaced | Heat input via shaft | G72) | |
| Circumferential load on outer ring or indeterminate load direction | Low loads, outer ring cannot be displaced | For high running accuracy requirements:K6,M6,N6andP6 | K7(K6) |
| Normal loads, shocks, outer ring cannot be displaced | M7(M6) | ||
| High loads, shocks(C/P＜6), outer ring cannot be displaced | N7(N6) | ||
| High loads, severe shocks, thin-walled housing, outer ring cannot be displaced | P7(P6) |
1, G7 for housings made from flake graphite cast iron GG, if bearing outside diameter D ＞ 250 mm and temperature difference between outer ring and housing ＞ 10 K.
2, F7 for housings made from flake graphite cast iron GG, if bearing outside diameter D ＞ 250 mm and temperature difference between outer ring and housing ＞ 10 K.
Housing tolerances for axial bearings
| Load | Bearing type | Operating conditions | Tolerance zone |
| Axial load | Axial deep groove ball bearings | Normal running accuracy High running accuracy | E8 |
| Axial cylindrical roller bearings with housing locating washer | - | H7(K7) | |
| Axial cylindrical roller and cage assemblies | - | H10 | |
| Axial spherical roller bearings | Normal loads High loads | E8 | |
| Combined loads Point load on housing locating washer | Axial spherical roller bearings | - | H7 |
| Combined loads Circumferential load on housing locating washer | Axial spherical roller bearings | - | K7 |
Source
ISO 286
DIN 620
Related
- Shaft to Shaft Axial Alignment Design Tolerances Tables
- Housing Tolerance Classifications for Metric Radial Ball and Roller Bearings
- Shaft Tolerance Radial Ball and Roller Bearings
- General ISO Geometrical Tolerances Per. ISO 2768
- Ball Bearings ABEC Standard Tolerances Data
- Bearing Types and Application Design | Ball Bearings | Roller Bearings | Thrust Bearings
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