Locking nuts – reliable connection without washers and lock washers

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2018-06-01 00:00:15

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Spontaneous loosening of threaded joints involves the danger of premature failure of various machines and mechanisms. Washer grower effectively prevents this undesirable phenomenon, but it has its drawbacks. First, it is an extra Assembly, and secondly, it when another fight just may forget to put in place.

locking nuts

How to do without washers for Grover

The Old way is to nevinchany the locknuts, that is another nut that is wrapped over the primary. This method is effective but not always applicable, especially in those cases where the weight of the machine or mechanism, for example in aviation and space-rocket technology.

To improve performance of products in almost all branches of engineering, came up with locking nuts, that is, such that vibration and other mechanical vibrations transcend.

To Achieve this result in several ways.

self-locking nut with nylon ring

Different types of self-locking nuts

The First method of improving the stability of a threaded connection consists in the installation details so that the nuts are self-locking when screwing the coils were tested for elastic deformation that is provided by the so-called “interference”, that is, positive tolerance, providing increased friction during tightening.

Similar deformations can also be achieved when rasnoavei cutting nut and bolt. For each following round, this difference will increase the force required to disassemble the node, which will eliminate arbitrary zamorazhivaniem.

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nylock nut GOST

There are self-locking nut with nylon ring, whereby the mechanical braking of any of their moves after the screwing. Elastic polymer liner also acts as an additional damper, i.e. the damper of mechanical vibrations, which also has a positive effect on the reliability of threaded connections.

A Means of solving the problem also serves as a thickening in the lower part with the special notch, creating increased friction after its pressing to the surface of the fixed part. Such locking nuts are easy to learn, they differ significantly in appearance from conventional their hex counterparts.

Original solution

locking nuts

There are other ways of preventing unwanted and untimely unscrewing. For connections that do not experience during the operation of the essential mechanical loads, can be used stamped sheet steel locking nuts, which creates a high resistance on the return stroke due to the springy properties of the material.

It is Possible to use additional gear rims, mounted at the bottom of the fastener. Increasing the friction at the contact points, ledges securely fix its position.

Despite the diversity of forms, every fastener produced according to national and international standards, including self-locking nut. GOST 5915-70 / DIN 985 are the documents governing their size (and they come with metric and inch thread) and material (ordinary steel, alloy or stainless steel).

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