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Dimensional accuracy (installed with the shaft and housing-related projects)
1, diameter, diameter, width, and width of the assembly tolerances
2, the roller group umbra umbra diameter and the outer diameter tolerance
3 Limits of chamfer dimension
4, the width to allow changes in the amount of
Rotational accuracy (beating on the rotary member projects)
1, the inner and outer ring radial runout and axial runout allowed
2, the inner lateral runout allowed
3, the outer surface to allow changes in the amount of inclination
4, the thickness of the thrust bearing raceway to allow changes in the amount of
SKF bearings size standard form of numerous mechanical devices designed in the best use of standard bearing (this bearing is designed to easily purchase, where you aside, some bearing the catalog model does have, but some non-standard bearings not in stock in mainland China, sometimes futures will be very long time, so the bearing selection cost and time to consider late replacement cost) bearing load, the load applied to the bearing, the nature, size, orientation is a multi- changed. Typically, the basic load ratings are displayed on the size of the table. However, the axial load and radial load, etc., is also an important factor bearing choose. When the ball and needle bearing size considerably, the needle roller bearings usually have a higher load capacity and withstand greater vibration and shock loading.
Permissible speed is based on SKF bearing type, size, precision, cage type, load, lubrication, and cooling method and other factors. Bearing table lists the standard precision bearings and grease lubricated under the allowed speed. Typically, deep groove ball bearings, self-aligning ball bearings and are suitable for high speed applications.
SKF Bearing dimensional accuracy and rotational accuracy is based on the ISO and JIS standards. For applications requiring high precision and high-speed operation of machinery, it is recommended to use five or more precision bearings, deep groove ball bearings, angular contact ball bearings or bearings are suitable for high operating precision machinery. Rigidity, when the bearing rolling elements and raceway contact surface pressure, generates elastic deformation. Some machines require the elastic deformation to a minimum. Roller bearings than ball bearings produced by small elastic deformation.
In addition, in some cases, SKF Bearing preload to be applied in order to increase rigidity. This procedure is commonly used deep groove ball bearings, angular contact ball bearings and tapered roller bearing inner ring bias, shaft bending, shaft or bearing housing tolerance variations, with errors cause eccentric inner and outer rings. To prevent the eccentric angle is too large, self-aligning ball bearings, self-aligning roller bearings, spherical bearing, or a better choice. Voice frequency and torque, bearing are manufactured according to standards of accuracy, so the voice and the torque is small. Deep groove ball bearings, and bearing suitable for a low voice, low-torque applications with special requirements.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7911CDB NSK | 55 | 80 | 13 |
| 7911A5DB NSK | 55 | 80 | 13 |