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Calculating PV for a Plain Bearing in 3 Steps

October 18, 2011 - Rockford, IL  -  Posted by Tech Team

Plain bearings must be evaluated for suitability in an application based on their “PV” rating.  Follow these 3 easy steps to calculate the potential performance of a plain bearing.Linear Bearing PV

 3 Steps to Calculate “PV” for a Plain Bearing

In order for a plain bearing (sliding bearing) to be suitable for use without lubrication in an application, the following 3 criteria must be met.  Follow these steps to calculate each of these parameters:

Step #1  -  Calculate “P”

 P = Maximum pressure or load in psi (kgf/cm2)


                Pressure is over the projected area of load:

Linear Bearing equation



Step #2  -  Calculate “V”

V = Maximum velocity or surface speed in sfm (m/min)

                Linear velocity  =  total distance traveled in one minute


                Rotational velocity  =

Linear Bearing equation


Step #3  -  Calculate “PV”

PV = P x V or the maximum pressure velocity value

NOTE:  All 3 parameters must be met in an application for a bearing to perform properly.

 The standard Simplicty® linear bearings utilizing the FrelonGOLD® bearing material has a maximum PV of 20,000.  To learn more the full line of PBC Linear plain bearings, their maximum performance values, and further technical information, visit



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