For spherical plain bearings requiring maintenance which are of the steel-on-steel type, the purpose of the lubrication is primarily to reduce wear, reduce friction and prevent scuffing. Also the grease serves to protect the bearings against corrosion . The frequency of relubrication of the bearing during its operation will appreciably extend the service life. 

For steel-on-PTFE fabric spherical plain bearings,there is a transfer of PTFE from fabric to the opposing steel surface of the inner ring . Any lubrication of the sliding contact surfaces would disturb this transfer and shorten bearing life. Therefore,lubrication of these bearings is not advisable.

For steel-on-PTFE composite material spherical plain bearings,as a rule,it must not be lubricated. When operating conditions are such that enhanced sealing and protection against corrosion are required, it is recommended that the bearing or the space surrounding the bearing is filled with lithium base grease. 

MoS 2: The wear occurring during running-in phase proceeds all the more favourably the more MoS 2 is embedded in the porous-crystalline manganese phosphate.There are two types:wet MoS 2 and dry MoS 2. Wet MoS 2 is treated with dipcoating ,Dry MoS 2 is treated with spray coating.The effect of dry MoS 2 is superior to wet MoS 2.If customer need dry MoS 2 ,please consult marketing department.