Technology
Bearing structure part
Bearing material
Bearing clearance
Bearing lubrication
Precision bearings
Bearing fit
Bearing vibration noise
Service Hotline 400-688-9811 0769-22335878
Bearing fit
The need for proper fit
In general, only when used with the bearing and the shaft has an appropriate amount of interference in order to obtain a satisfactory radial location and adequate support force, inappropriate or wrong stationary bearing rings generally cause damage on bearings and their accessories. Therefore, when selecting the right fit, you must do careful research.
Rotating condition is considered bearing ring and the load direction of the relationship, usually with "rotating load" and "static load." Bearing member rotating in loading conditions, generally applicable interference fit to prevent the bearing from slipping. Meanwhile, in the case of static load, it may choose a clearance fit to suit particular operating conditions or to facilitate installation and removal of bearings.
With bearing and shaft
|
Load
|
Example
|
ID
|
Shaft tolerance
|
|
|
Rotating outer
ring load |
It requires inner
ring on the shaft container
Easy to move |
In the stationary wheel shaft
|
All Shaft
|
g6
|
|
It does not require
the inner ring on the shaft
Easy to move |
Tension pulleys,
sheaves
|
h6
|
||
|
Rotating inner load |
Light load
(＜0.06 Cr1) |
Electric Tool
Pumps, hair dryer Transportation Precision instruments, machine tools |
<18
|
js5
|
|
18 to 100
|
js6 (j6)
|
|||
|
100 to 200
|
k6
|
|||
|
Normal load
(0.06~0.13 Cr) |
General application
of the bearing, Large motors, Turbines, pumps, Engines, gears, Woodworking machines |
<18
|
js5~6（j5~6）
|
|
|
18 to 100
|
k5~6
|
|||
|
100 to 140
|
m5~6
|
|||
|
140 to 200
|
m6
|
|||
|
200 to 280
|
n6
|
|||
Bearings and bearing mating
|
Load
|
Example
|
Housing bore
tolerances |
||
|
Metal bearing
|
Rotating outer ring load
|
Normal load or heavy load
|
Car wheels
Shaker |
N7
|
|
Light load or load swing
|
Conveyor roller，pulley
Tensioner |
N7
|
||
|
Non-directional load
|
Heavy shock load
|
Traction motor
|
M7
|
|
|
Normal load or heavy load
|
Pumps, crankshaft main bearings, Medium and large motors |
K7 |
||
|
Normal load or light load
|
||||
|
Rotating inner
ring load
|
Various loads
|
|||
|
Metal or separate
housings |
General Bearing
Applications |
H7
|
||
|
The inner ring and shaft
generate high temperature |
Desiccant paper
|
G7
|
||
|
Metal bearing
|
Under normal light
load conditions and require precise rotational torque |
Grinder drive end
ball bearings
High-speed centrifugal compressor swimming -end bearing |
JS6(J6)
|
|
|
non-directional load
|
Grinder drive end
ball bearings
High-speed centrifugal compressor swimming -end bearing |
K6
|
||
Shaft tolerance
|
Diameter |
g6
|
h6
|
js5
|
j6
|
js6
|
k5
|
k6
|
m5
|
m6
|
||||||||||
|
more
than |
Less
than |
High
|
Low
|
High
|
Low
|
High
|
Low
|
High
|
Low
|
High
|
Low
|
High
|
Low
|
High
|
Low
|
High
|
Low
|
High
|
Low
|
|
3 6 10 |
6 10 18 |
-4 -5 -6 |
-12 -15 -17 |
0 0 0 |
-8 -9 -11 |
+2.5 +3 +4 |
-2.5 -3 -4 |
+6 +7 +8 |
-2 -2 -3 |
+4 +4.5 +5.5 |
-4 -4.5 -5.5 |
+6 +7 +9 |
+1 +1 +10 |
+9 +10 +12 |
+1 +1 +1 |
+9 +12 +15 |
+4 +6 +7 |
+12 +15 +18 |
+14 +6 +7 |
|
18 30 40 |
30 40 50 |
-7 -9 -9 |
-20 -25 -25 |
0 0 0 |
-13 -16 -16 |
+4.5 +5.5 +5.5 |
-4.5 -5.5 -5.5 |
+9 +11 +11 |
-4 -5 -5 |
+6.5 +8 +8 |
-6.5 -8 -8 |
+11 +13 +13 |
+2 +2 +2 |
+15 +18 +18 |
+2 +2 +2 |
+17 +20 +20 |
+8 +9 +9 |
+21 +25 +25 |
+8 +9 +9 |
|
50 65 80 |
65 80 100 |
-10 -10 -12 |
-29 -29 -34 |
0 0 0 |
-19 -19 -22 |
+6.5 +6.5 +7.5 |
-6.5 -6.5 -7.5 |
+12 +12 +13 |
-7 -7 -9 |
+9.5 +9.5 +11 |
-9.5 -9.5 -11 |
+15 +15 +18 |
+2 +2 +3 |
+21 +21 +25 |
+2 +2 +3 |
+24 +24 +28 |
+11 +11 +13 |
+30 +30 +35 |
+11 +11 +13 |
|
100
|
120
|
-12
|
-34
|
0
|
-22
|
+7.5
|
-7.5
|
+13
|
-9
|
+11
|
-11
|
+18
|
+3
|
+25
|
+3
|
+28
|
+13
|
+35
|
+13
|
|
120
|
140
|
-14
|
-39
|
0
|
-25
|
+9
|
-9
|
+14
|
-11
|
+12.5
|
-12.5
|
+21
|
+3
|
+28
|
+3
|
+33
|
+15
|
+40
|
+15
|
|
140
|
160
|
-14
|
-39
|
0
|
-25
|
+9
|
-9
|
+14
|
-11
|
+12.5
|
-12.5
|
+21
|
+3
|
+28
|
+3
|
+33
|
+15
|
+40
|
+15
|
Note: 1) Cr: Representative bearing basic load 2) special purpose, please contact ZGSL engineers