This section provides an overview for oilless washers as well as their applications and principles. Also, please take a look at the list of 10 oilless washer manufacturers and their company rankings.
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An oilless washer is a washer that does not use lubricating oil when tightening bolts and nuts to prevent nuts from rotating or loosening, or to prevent nuts and bolts from sticking to members.
Generally, washers are coated with lubricant to prevent seizure and wear because they are subjected to axial loads, called thrust (axial) loads. An oilless washer, on the other hand, can support thrust loads without lubrication, reducing the frequency of replacement and the need for maintenance.
Uses of oilless washers are the same as those of ordinary washers: to prevent nuts from rotating and loosening, and to protect parts and bolts/nuts. As with ordinary washers, they are used in relatively large machinery and parts, such as automobiles and general industrial machinery, as well as in small electronic equipment.
They are used in a wide range of applications, from relatively large machinery parts such as automobiles and general industrial machinery to small electronic devices. Because of its features of not requiring lubricant, it is generally used in places where lubricant is not available or difficult to lubricate, or where the effect of applying lubricant cannot be expected.
On the other hand, since friction is not completely suppressed, this type of washer is not suitable for high-speed applications, and care must be taken to ensure maintenance frequency when used in such applications.
When using ordinary washers, lubricating oil such as oil or grease is used to prevent thermal seizure and friction caused by frictional resistance due to load. Oilless washers, on the other hand, can take this load without lubricant and reduce friction. Under normal conditions of use, oilless washers are used in conjunction with oilless bearings called oilless bushings. The principle by which these products do not require lubrication varies from product to product, but, most commonly, friction is reduced by embedding or mixing a solid lubricant on the friction surface. In addition to these advances in lubrication technology, advances in processing technology have made it possible to manufacture washers in high-precision perfect circles, which have contributed to the widespread use of oilless washers.
Oilless washers are made of metal, but self-lubricating resin washers called thrust washers and multi-layer products with resin coating on the friction surface of the shaft are also available, and these washers are sometimes treated as a type of oilless washers.
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