About This Item
Material – Made of cast brass and fitted with graphite which is self-lubricating and does not require oiling. Has good load capacity and wear resistance.
Function – Also known as plain bearings or bushings. They are mainly used to guide or reduce friction in linear applications.
Application – Used in various industrial equipment such as electrical equipment, household equipment, printing machines and machine tools.
General, Bushing from China, we offers free CAD downloads, short lead times, competitive pricing, and small minimum order quantity.
The Self-Lubricating oilless components manufactured by us are mainly used to guide or control some form of linear motion, usually under considerable loads. The range of possible applications is very wide: molds, fixtures, special machines and all types of heavy equipment. Our parts have an extremely long service life, often exceeding the life of the tool or machine on which they are mounted. Almost all of our sales are for new constructions.
Self-Lubricating Components, Oilless Bushing Factory Direct Wholesale
Many of our self-Lubricating oilless components are self-lubricating. Self-lubricating parts are initially more expensive than conventional parts; however, they have the advantage of built-in permanent lubrication. No additional lubrication is ever required. In terms of total life cycle cost (i.e., taking into account the cost of periodic lubrication), self-lubricating parts are always less expensive than conventional parts-often quite low, because of the risk of not using lubrication.
Graphite Self-Lubricating Oilless Bushes
Graphite plugs provide self-lubrication. Graphite has some unusual properties that make it an excellent lubricant. Chemically, it is one of the three common isomers of carbon (amorphous carbon and diamond are the other two). In contrast to diamond, which has a very dense and strong three-dimensional crystal structure, graphite has a two-dimensional crystal structure – strong in two dimensions, but weak in the third. Its atoms are arranged in parallel sheets that can be easily sheared off, which gives graphite its characteristic slipperiness. For example, if you rub a pencil lead with your fingertip, it will feel greasy. This sensation is the sliding and flaking of the crystal flakes.
It is these sheared off crystal flakes that provide the lubrication during the self-lubrication process, sort of like a piece of tissue paper between two pieces of glass. Initially there is no lubrication, but as the two mating surfaces (e.g., bushings and shafts) move against each other, trace amounts of graphite are distributed across the wear surface and function as a solid lubricant. Because of its excellent stability, graphite will stay there for a long time. While graphite will sublimate at 10,000 degrees Fahrenheit in a reducing environment, it will oxidize in air at about 500 degrees Fahrenheit, so it is important to keep the temperature well below this threshold. In addition, the coefficient of thermal expansion of graphite is almost zero. When a graphite plug is embedded in a metal part, the metal will expand, but the graphite plug will not. The plug will loosen, and if the plug has any open surface (i.e., not limited by the mating part), then the temperature range will be limited to about 200 degrees Fahrenheit.
Additional lubrication of Self-Lubricating oilless parts with graphite
In general, we do not recommend this. The only exception is when new parts are fitted together and several cycles are required to distribute the graphite over the wear surface. Some customers have found it useful to rub a little light oil (never grease) on the wear surface, which can be used as a temporary lubricant until the self-lubricating action begins. Beyond that, any additional lubrication is actually detrimental to the graphitized part. Liquid lubricants tend to attract dust and grit, leading to premature wear of the graphite. Grease is a particular problem; graphite shaft bearing bushing parts should never be lubricated.