Resources
Glossary
Zerk Fitting
A zerk fitting (also known as a grease fitting, grease nipple, or Alemite fitting) is a small, one-way mechanical valve that allows grease and other lubricants to be injected into moving parts, such as bearings and joints, under pressure.
Its design includes a spring-loaded ball check valve. When a grease gun is applied, the ball is pushed down, opening a passage for the lubricant to enter. Once the gun is removed, the ball seals the opening to prevent the grease from escaping and to keep dirt and contaminants from getting in.
Zerk fittings provide a clean and efficient way to lubricate machinery without needing to take it apart, which helps to reduce friction and wear and extend the lifespan of mechanical assemblies. They are commonly found on automotive, agricultural, and industrial equipment.
AKA: Grease Fitting, Grease Nipple, Alemite Fitting
