Function And Principle Analysis Of Spring Washer

In all kinds of mechanical connection, bolt loosening is a very important link. There are many ways to prevent bolts loosing, including using spring washers to prevent loose bolts. So why is it used so often? It starts with the function and principle of the spring washer.

The function of spring washer

The basic function of the spring washer is to give a force to the nut after it is tightened, increasing the friction between the nut and the bolt! It is a protective measure added to prevent the loosening of fastening bolts caused by vibration of equipment in operation.

The anti-loosening principle of the spring washer

The anti-loosening principle of the spring washer is that after the spring washer is flattened, the spring washer will generate a continuous elastic force, so that the threaded connection pair of the nut and bolt will continue to maintain a friction force, generating a resistance moment, so as to prevent the nut from loosening. At the same time, the sharp Angle at the opening of the spring washer is inserted into the surface of the bolt and the connected part respectively, so as to prevent the bolt from rotating relative to the connected part.

However, it has been proved that spring washers can only provide 10 N/m elasticity, and 10 N/m elasticity is negligible for a 280 N/m bolt pretightening moment. Secondly, such a small force is not enough to make the sharp Angle of the spring washer cut into the bolt and the surface of the connected piece. After dismounting, it can be found that there is no obvious indentation on the surface of the bolt and the connected part. Therefore, the anti-loosening effect of spring washers on bolts can be ignored.

From the point of view of the function and principle of the spring washer, using the spring washer to prevent loosening is not a very good method of preventing loosening, or we should find a more ideal method of preventing loosening by increasing the friction resistance moment. Of course, if you already know about spring washers and are sure you need them, you can go ahead and use them.

Anji Xinchi Fastener Co., Ltd. is a fastener company providing one-stop solutions and is the designated fastener supplier of “Staples”. As a trusted supplier of fasteners, Xinchi can provide a range of high-quality fasteners including 4 prong t nuts, bolts, screws, washers, sleeves, etc. If you would like to know more about fasteners or want to wholesale fasteners, please do not hesitate to contact us. Our experienced professional service team will respond to you in the first place.