Maintenance-free steel/PTFE FRP sliding contact surface combination

The basic rating life can be calculated using

Gh = b1 b2 b3 [KM / (p v)]


G = 60 f Gh


Gh=basic rating life, operating hours [h]
G=basic rating service life, number of oscillations
b1=load condition factor (table 1)
b2=temperature factor (diagram 1)
b3=sliding factor (table 2)
KM=material constant (table 2)
p=specific bearing load [N/mm2]
v=mean sliding velocity [m/s]
f=frequency of oscillation [min–1]


  1. The basic rating life calculated from the above equation can be doubled if the bearings are relubricated occasionally (Lubrication and Relubrication)
  2. Rating life calculations consider the influence of the load and sliding velocity. Under very light loads, and/or low sliding velocities, the result shows relatively long life. The longer the service life the more important is the influence of contaminants such as dirt, moisture and corrosion. Depending on the operating conditions, accurate life calculations may not be possible.
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