6mm-1.0 x 8mm x 15mm Zinc Plated Steel Coarse Thread Straight Grease Fittings 8PK, Midwest Fastener, Mfr#: 67161

A grease fitting is a lubrication fitting used in mechanical systems to add grease with a grease gun. The fitting is permanently installed by a threaded connection leaving a nipple connection the grease gun attaches to. By using the pressure in the grease gun, grease is added to the system through the grease fitting.