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Grease fitting on a bearing A grease nipple on the driver's door of a 1956 VW Beetle. A grease fitting, grease nipple, Zerk fitting, grease zerk, or Alemite fitting is a metal fitting used in mechanical systems to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun.
The first hubcaps were more commonly known as dust or grease caps. These caps are threaded onto the center hub on the wood, steel, or wire wheel. These were made from the beginning of car manufacturing to 1932. Pre-1915 hubcaps were all mostly made of brass that was nickel-plated. The 1920s hubcaps were mostly aluminum.
A dustcap is a small cover used on the valve stem of a bicycle or car tire to prevent dust or other small particles from entering the valve and damaging it. Dustcaps are usually made from plastic but may occasionally be made of metal. The dustcap is internally threaded and is secured by screwing it onto the end of the stem.
The dust cap (also known as dust dome, or dome) is a gently curved dome mounted either in concave or convex orientation over the central hole of most loudspeaker diaphragms. It protects the inner mechanics (such as the pole pieces and the voice coil ) from small particles (which can cause rubs ) and other contamination.
Various sealing arrangements may be provided to prevent dust and other contaminants from entering the housing. Thus, the housing provides a clean environment for the environmentally sensitive bearing to rotate free from contaminants while retaining lubrication, either oil or grease, increasing its performance and duty cycle.
Swiss Fittings is legally protected the German Brand "Pressfittings aus Edelstahl" in the USA. [33] Press fittings of some major brands carry a plastic slip [clarification needed] around the sleeves on each end of the fitting which falls off when the fitting has been compressed. This allows for a simple identification whether a press fitting ...
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