Abstract: A self-lubricating gear-type spindle coupling for use with rotating equipment such as rolling mills, where lubrication is critical. The self-lubricating coupling includes reservoirs connected by first valve means to plenums formed by the retraction of the spring guides in the guide channels when the roll shaft is engaged at roll insertion. A partial vacuum is created in the plenums causing the first valve means to open and the plenums to fill with lubricant from a lubricant reservoir contained in the spindle shaft. When the roll shaft is removed and the compressive force is released from the spring assemblies, the guides move forward in the channels opening second valves which permit the lubricant to pass through the spring housings and onto the sleeves and hubs of the coupling to lubricate the gear teeth.