| Load Conditions |
Examples |
Tolerances for Housing Bores |
Axial Displacement of Outer Ring |
Remarks |
| Solid Housings |
Rotating Outer Ring Load |
Heavy Loads on Bearing in Thin-Walled Housing or Heavy Shock Loads |
Automotive Wheel Hubs (Roller Bearings) Crane Travelling Wheels |
P7 |
Impossible |
|
| Normal or Heavy Loads |
Automotive Wheel Hubs (Ball Bearings), Vibrating Screens |
N7 |
| Light or Variable Loads |
Conveyor Rollers, Rope Sheaves, Tension Pulleys |
M7 |
| Direction of Load Indeterminate |
Heavy Shock Loads |
Traction Motors |
| Normal or Heavy Loads |
Pumps, Crankshaft Main Bearings, Medium and Large Motors |
K7 |
Generally Impossible |
If axial displacement of the outer ring is not required. |
| Solid or Split Housings |
Normal or Light Loads |
JS7 (J7) |
Possible |
Axial displacement of outer ring is
necessary. |
| Rotating Inner Ring Load |
Loads of All Kinds |
General Bearing Applications, Railway Axleboxes |
H7 |
Easily Possible |
|
| Normal or Ligh Loads |
Plummer Blocks |
H8 |
| High Temperature Rise of Inner Ring Through Shaft. |
Paper Dryers |
G7 |
| Solid Housing |
Accurate Running Desirable under Normal or Light Loads |
Grinding Spindle Rear Ball Bearings, High-Speed Centrifugal Compressor Free Bearings |
JS6 (J6) |
Possible |
|
| Direction of Load Indeterminate |
Grinding Spindle Front Ball Bearings, High-Speed Centrifugal Compressor Fixed Bearings |
K6 |
Generally Impossible |
For heavy loads, interference fit tighte han K is used. When high accuracy is required,very strict tolerances should be used for fitting. |
| Rotating Inner Ring Load |
Accurate Running and High Rigidity Desirable under Variable Loads |
Cylindrical Roller Bearings for Machine Tool Main Spindle |
M6 or N6 |
Impossible |
| Minimum noise is required. |
Electrical Home Appliances |
H6 |
Easily Possible |
|
