Calculator

MicroPoly-filled bearings do have speed limitations. The following formula and chart determine the maximum allowable speed for a MicroPoly-filled bearing running at room temperature.

Maximum RPM = NDM Value
1/2 (Bore + O.D.) Note: Bore and O.D. must be in mm.

Limiting Speeds:

Bearing Type	NDM Value
Single row ball bearing, metal cage	300,000
Single row ball bearing, plastic cage	40,000
Double row ball bearing	150,000
Angular contact ball bearing	150,000
Self-aligning ball bearing	150,000
Cylindrical roller bearing	150,000
Spherical roller bearing	85,000
Tapered roller and roller thrust bearings Note: For double tapered roller bearings, calculate the maximum RPM for a single tapered roller bearing and divide by two.	45,000

These values are based on normal ambient operating temperatures. As operating temperatures increase, the maximum operating speed may have to be decreased.

The values reflected in the table above may be affected by the quality of the bearings used. High quality bearings generally outperform lower quality bearings.

Maximum RPM Calculator

BORE (mm)	OUTER DIAMETER (mm)

MAXIMUM RPM* at ambient temperature:

* Maximum allowable RPM will decrease with increasing temperatures. If your application is at elevated temperatures, please discuss with PhyMet personnel.