Grease nipples, also known as grease fittings or zerk fittings, are small mechanical components used in machinery and equipment to facilitate the lubrication of bearings, joints, and moving parts. They are typically made of metal and have a threaded or push-on design that allows for the attachment of a grease gun or lubrication device.

Grease nipples serve as access points to introduce grease into the lubrication system of machinery. By applying grease through the nipple, it is distributed to the relevant components, ensuring proper lubrication and reducing friction, wear, and heat generation. This helps to extend the lifespan and optimize the performance of the equipment.

Grease nipples come in various types and sizes to fit different applications and systems. Common types include straight fittings, angled fittings, and button-head fittings. Straight fittings are used for direct access, angled fittings are used in hard-to-reach areas, and button-head fittings have a protective cap for added security.