The cooperation between bearings, shafts and bearing housings is determined by ISO tolerance between shaft and bearing, tolerance between shaft and bearing ΔDmp.
tolerance between shaft and bearing zone, ISO tolerance between shaft and bearing is defined in the form of tolerance zone. tolerance between shaft and bearing zones are determined by their distance from the reference line (= tolerance zone position) and dimensional difference (= tolerance zone grade). tolerance between shaft and bearing zone positions are indicated by letters (uppercase letters indicate seat hole tolerance between shaft and bearing and lowercase letters indicate shaft tolerances).
Tolerance between shaft and bearing of Radial bearings with cylindrical bore
| Rotation condition | Bearing type | Shaft diameter mm |
Mobility: Load |
Tolerance zone |
| Point load on inner ring | Ball bearing
Roller bearing |
All sizes | The inner ring is easy to move | g6(g5) |
| The inner ring is not easy to move Angular contact ball bearings and belts adjustable Tapered roller bearing with inner ring |
h6(j6) | |||
| Needle bearing | All sizes | Floating bearing | h6(g6)1) | |
| Inner ring bears circumferential load Or uncertain load direction | Ball bearing | 0~50 | General load 2)
Low load 3) |
j6(j5)
j6(j5) |
| 50~100 | Low load General and heavy loads | k6(k5)
m6(m5) |
||
| More than 200 | Low load General and heavy loads |
m6(m5)
n6(n5) |
||
| Roller bearing | 0~60 | Low load General and heavy loads |
j6(j5)
k6(k5) |
|
| 60~200 | Low load General load Heavy load |
k6(k5)
m6(m5) n6(n5) |
||
| 200~500 | General load Heavy load Impact load |
m6(n6)
p6 |
||
| More than 500 | General load Heavy load |
n6(p6)
p6 |
||
| Needle bearing | 0~50 | Low load General and heavy loads |
k6
m6 |
|
| 50~120 | Low load General and heavy loads |
m6
n6 |
||
| 120~250 | Low load General and heavy loads |
n6
p6 |
||
| 250~400 | Low load General and heavy loads |
p6
r6 |
||
| 400~500 | Low load General and heavy loads |
r6
s6 |
||
| More than 500 | Low load General and heavy loads |
r6
s6 |
Tolerance between shaft and bearing of Thrust bearing
| Load | Bearing type | Shaft diameter | Working condition | Tolerance zone |
| Axial load | Thrust ball bearing | All Size | - | j6 |
| Double direction thrust ball bearing | - | k6 | ||
| Axial cylindrical roller bearings | - | h6(j6) | ||
| Inferred cylindrical roller and cage assembly | - | h8 | ||
| Combined load | Thrust spherical roller bearings | All size | Bearing ring bearing point load | j6 |
| 0~200mm | Shaft washers bear circumferential loads | j6(k6) | ||
| More than 200mm | k6(m6) |
There may be deviations in specific applications, such as those related to operating accuracy, smoothness of operation, or operating temperature. Higher operating accuracy requires smaller tolerance between shaft and bearing, such as higher tolerances than level 5. If the temperature of the inner ring of the bearing is higher than that of the bearing during operation, the fit will loosen and exceed the allowable value. This requires a tighter fit, such as replacing m6 with k6
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Contact: Grace
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