How To Tighten China Nut
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- The tighter the screw, the better
Many Bolt Factory staff have such a misunderstanding: that the bolts should be "tighter than loose", so they deliberately increase the tightening torque, resulting in the bolt slip. In addition, some important bolts need to be tightened with torque, but some people use adjustable wrenches to save trouble. As a result, the torque is insufficient, which leads to the loosening of the bolts and even mechanical failure.
- The washer is too large
Sometimes there is a lack of washers of the right size, and some workers will replace them with washers with larger inner diameters. In this case, the contact area under the bolt head with the washers is small, which will reduce the bearing pressure or locking force of the washers. If the working environment is There are vibrations and shocks, and the bolts are easily loosened.
- Improper locking
Important bolts should be locked with anti-loosening device after assembly. Here are four cases to explain. If a split pin is used for locking, it must not be locked with a thin split lock or half-piece split lock; if a spring washer is used for locking, it must not be used with a washer that has too small an opening error; if a lock is used for locking, the lock must not be locked The edges and corners of the nut; if a double nut is used for locking, the thinner nut must not be installed outside.
- The false solidity of China Nut
If the bolts, nuts, or threads are rusted, or impurities such as scale, iron filings, etc., must be cleaned before assembly; burrs, sand and other impurities on the joint surface of the coupling must also be removed. Otherwise, when the bolts are tightened, they appear to be tightened on the surface, but in fact the couplings are not really tightened. Under such false solidity, the bolts will loosen quickly if vibration, load shock and temperature change occur.