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.
Depending on their design, SKF rod ends are either completely or partially coated with an oily preservative or filled with grease. Avoid skin contact as these substances may cause skin irritation or an allergic reaction.