Grease Fitting, Zerk, Self-Tapping, 1/4"-28 Thread, Straight

This a 1/4 inches-28 taper thread, straight, 0.54 inches grease fitting. It is used on most auto vehicles and on industrial equipment. The threads conforms to society of automotive engineer’s lubrication thread specification. The ball check prevents dust and dirt contamination. These fittings have a ball check in the head to prevent dirt and grit from getting into the fitting, heavier wall thickness for extra strength, are zinc plated with a yellow passivated finish for maximum protection against corrosion, and have a stress relieved and tempered carbon steel spring.