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Do you know fit of tolerance between shaft and bearing?

28 Published by Mar 03,2020

The cooperation between FAG 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

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 bearingTolerance 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 FAG 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

If you need any brand bearings or any models of bearings, please contact me!

Contact: Grace
Email: ntn@llhbearing.com
Skype:+8618668903871
MP/Whatsapp: 008618668903871
Wechat:GraceXu1234

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