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Main bearing SKF bearings speed within the limits of the temperature rise caused by frictional heating, when speed exceeds a certain threshold, and bearings will burn and not continue to rotate.
SKF bearing limit rotational speed refers to the frictional heating does not cause burns and continuous rotation of the boundary values.
Therefore, bearing limit speed depends on the type, dimension, and precision, as well as SKF bearing lubrication, lubricant, maintenance of quality and quantity and type of material, loading conditions, among other factors.
All kinds of bearings with grease lubrication and oil lubrication (oil bath lubrication) when the speed limit is contained in the table bearing size, the value represents a standard design of bearings under normal load conditions (around C/P>=13,Fa/Fr<=0.25), rotation speed of limit value.
In addition, according to their kinds and brands of lubricants different or better than other performance but not to spin.
Amendment to limit speed
Load C/P<13 (the equivalent dynamic load p more than the basic dynamic load rating c about 8%), or under synthetic load more than the radial load axial load in 25%, amendments to limit speed to use.
na=f1*f2*n
Here,
NA: amended to limit speed, RPM
F1: associated with the load correction factor
F2: with respect to the resulting load correction factor
N: under normal load conditions limit speed, RPM (reference table bearing size)
CA: basic dynamic load rating, N{kgf}
P: equivalent dynamic load, N{kgf}
Fr: radial load, N{kgf}
Fa: axial load, N{kgf}
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32918XU NTN | 90 | 125 | 23 |
| 32317U NTN | 85 | 180 | 60 |