First, thicken Plain Hex Nut
Some people often mistakenly believe that the thickening nut can increase the number of working turns of the thread, thereby improving the reliability of the coupling. In fact, the thicker the nut, the more uneven the load distribution between the threads of each ring, and the more easily the coupling is loose.
Second, improper lockup
Important T Bolts Home Depot should be locked after installation. When using the split pin to lock, the common mistake is to use a thin opening lock or a half-piece open lock; the common mistake is to lock the washer opening too small, lose the elasticity; lock with the lock piece The common mistake is to lock the locking piece at the corner of the nut; the common mistake of locking with a double nut is to put the thinner nut on the outside and not tighten it tightly.
Third, false and solid
Bolts, nuts or screw holes have rust, scale, iron filings, sand, and other impurities, or the joint surface of the coupling has burrs, sand, and other impurities, which are not removed before assembly. When tightening the bolts, due to impurities Blocking effect, the surface is tightened very tightly, the torque value has reached the requirement, but in fact the coupling is not really compressed; in addition, there is a case, due to the action of the sludge, scale and other impurities in the screw hole, Although the bolt torque is in compliance, the work piece is not compressed. Under such false sturdiness, vibration, load shock, and temperature changes often cause the bolt to loosen quickly.
Four, one mother and more mat
In the installation, sometimes the bolts are too long after assembly, so some people put a lot of Spring Washers on one bolt so that the spring washers are unevenly stressed during the sturdy process, and some will break so that the bolts are pre-tightened. The force is reduced; or an eccentric load is generated, which reduces the reliability of the bolt connection.