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Grease Fittings


Grease fittings are lubrication fittings used in mechanical systems to add grease with a grease gun. These fittings are permanently installed by a threaded connection leaving a nipple connection that the grease gun attaches to. By applying pressure to a ball valve (usually made of spring-loaded steel) in the fitting, grease flows into the lubricating chamber but cannot flow out. The ball valve fitted to the internal side of the inlet passageway also prevents dirt intrusion and functions as a shutoff valve to prevent grease escaping back out of the nipple. Grease, zerk or nipple fittings as they are otherwise commonly known, are usually made of carbon steel, mild steel, stainless steel, or brass.

There are many different types of grease fittings. There are Hydraulic fittings which are available in threaded, thread-forming, drive or rivet styles. Grease fittings also include button-head, protruding, bayonet-style, and plug-and-elbow devices. Button-head grease fittings are designed for construction equipment and heavy-duty machinery. Protruding fittings should be used with revolving bearings.

There are a number of factors one has to consider before buying a type of grease fitting, such as the overall length, shank length, wrench size, thread type, and the materials that are used in the construction. These fittings are sometimes case-hardened or plated with zinc to prolong their life and to prevent them from getting corroded with use.

Grease fitting are normally used in hand-held grease guns, while most others are suited for automobile manufacturing plants, industrial equipments with drive shaft diameters in excess of 20 millimeters, as well as on marine engines.

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For a further information on our full range of Grease fittings, please visit us at our factory and showroom at Roway Lane, Oldbury, West Midlands, B69 3EJ. You can also call us at 0121 544 3090 or email us at sam@lumeter.co.uk for any queries you may have.