What’s grease nipple?Where to use?
Source:    Publish Time: 2014-01-14 03:56   3810 Views   Size:  16px  14px  12px
What’s grease nipple?Where to use?
 A grease fitting, grease nipple or Zerk 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. Generally a spring-loaded steel ball is fitted to the internal side of the nipple inlet passageway to exclude dirt intrusion and function as a shutoff valve to prevent grease escaping back out of the nipple. The ball is almost flush with the surface of the nipple so it can be wiped clean to reduce the amount of debris carried with the grease into the bearing. Grease nipples are commonly made from carbon steel,stainless steel or brass.
However, in many modern applications they are falling out of use, because it has been determined by wear analyses that each new grease injection usually contains abrasive contamination, and thus service life is reduced compared to many "sealed for life" systemsGrease nipples are rarely found on consumer goods, appliances, or modern cars. They are commonly used on industrial equipment with drive shaft diameters in excess of 20 millimeters, as well as electric motors larger than 5 kilowatts. Zerk fittings, also sometimes called grease fittings, are commonly found on marine engines. Besides providing fresh lubrication, pumping grease into a Zerk fitting on a boat motor or lower unit expels moisture that would