Maintenance-free rod ends
Maintenance-free, self-lubricating rod ends are designed to be used as dry sliding bearings and must not be lubricated. Consequently, these rod ends do not have a relubrication facility in their housings.
Steel/PTFE FRP rod ends are an exception. They can be used without additional lubricant, but their service life can be extended appreciably if they are lubricated prior to use.