Bearing Load Ratings are bearing specific data, derived from the characteristics of the
materials used. They are used when selecting Spherical Plain Bearings or Rod Ends for
a particular load, but may have to be reduced in adverse operating conditions.

Static Loads Ratings C_o [kN]
C_o indicates the maximum permissible static load which a Rod End at its weakest cross
section can withstand without developing permanent distortion. The C_o values listed in
the tables have been calculated by using the appropriate material specifications and
have been tested in a number of Rod Ends during tensile tests carried out at ambient
temperature. 80% of the yield strength resulting from the tests have been used so that
a safety factor of 1.25 is included.
The static load C_o  is also used for establishing the maximum axial load which is limited
by an additional bending stress principally due to the method of fastening of the insert.
The maximum axial load has been established by pressure testing carried out at the
maximum angle a (illustration 3).

a = 0,5 for GI/GA + GIO/GAO
a = 0,3 for all others

With regards to the Spherical Plain Bearings due to the nature of housing C_o is
considered to be the same as with Rod Ends.


Illustration 3: Pivoting and oscillating angle 

Dynamic Load Ratings C [kN]
This rating is used to establish the working life of Spherical Plain Bearings or Rod
Ends when under dynamic load conditions. That is to say when they oscillate, rotate
or pivot under load. The values listed in the table result from multiplying the maximum
surface pressure p_max admissible in sliding movements by the projected bearing
surface. A_proj, whereby a specific load rating is established for each type of Rod Ends.

The established standard values for maximum surface load for various combinations
of anti friction material have been listed in table 1 which allows for movement when
oscillating.

Table 1: Maximum surface pressure