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An electric wrench is a power or battery powered wrench and is a tool for tightening bolts. Mainly used in the steel structure installation industry, specializing in the installation of high-strength bolts of steel structure, high-strength bolts are used to connect the joints of steel structures, usually in the form of bolts.

1. Use a force to pull the wrench gently and evenly. Never use a short, impulsive force to pull, because the jerk will produce an impulse, and the screw or bolt may have twisted over the head at the moment of stopping the force.
2. Contaminants can prevent accurate torque values. If the parts and tapped holes are contaminant, it will not be possible to have the correct torque value.


3. Friction is a ubiquitous phenomenon, but it also has two effects. The good thing is to keep the parts together; the bad part is that it can have erroneous results when tightened. A mechanic manually tightens the coupling force by only 10%-20% for tensioning, and in many cases, 40%-50% of the torque is used to overcome the friction between the bolt head and the part, along the bolt Additional friction is created by the mating thread surface of the screw hole. Therefore, all these friction factors and other factors should be taken into account when tightening the bolts.3. Friction is a ubiquitous phenomenon, but it also has two effects. The good thing is to keep the parts together; the bad part is that it can have erroneous results when tightened. A mechanic manually tightens the coupling force by only 10%-20% for tensioning, and in many cases, 40%-50% of the wrench's torque is used to overcome the friction between the bolt head and the part. Additional friction is created along the mating thread surfaces of the bolts and tapped holes. Therefore, all these friction factors and other factors should be taken into account when tightening the bolts.


4. When tightening the nut or bolt with damage or obstacle on the thread, pay attention to how much additional torque is required to pass the damaged part, and add this additional torque to the recommended torque value.

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