1. Thicken the Nut

Some people often mistakenly believe that thickened nuts can increase the number of working turns of the thread, so as to improve the reliability of the connecting parts. In fact, the thicker the nut, the more uneven the load distribution between the threads of each ring, the easier it is to lead to the loosening of the connecting parts.

2. Improper Locking

After the important bolts are assembled, they should be locked by an anti-loose device. When the cotter pin lock is used, the common mistake is to use too thin opening lock or half a piece of opening lock lock; The spring washer is used to lock, the common mistake is that the spacing of the washer opening is too small, the loss of elasticity; The common mistake is to lock the lock piece at the corner of the nut. With double nut locks, a common mistake is to put the thinner nut on the outside and not tighten it tightly.

3. False Firm

There are rust stains, scale, iron filings, sand and other impurities in the threads of bolts, nuts or screw holes, or there are burrs, sand and other impurities on the joint surface of the connecting parts, which are not removed before assembly. When tightening the bolts, due to the blocking effect of impurities, the surface is screwed very tight, and the torque value meets the requirements, but in fact the connecting parts are not really pressed; In addition, there is another situation, due to the jacking effect of impurities such as mud and scale in the screw hole, although the bolt torsion meets the requirements, but the working part is not pressed. Under such false firmness, vibration, load impact, and temperature changes often cause bolts to loosen quickly.

4. A Mother More Pads

In the installation, sometimes there will be too long after the installation of the bolt phenomenon, so some people will install a bolt on a lot of spring washer, so that in the firm process of the spring washer uneven force, some will break, so that the preload of the bolt decline; Or produce eccentric load, reduce the reliability of bolt connection.

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