What is the appropriate torque for an electric wrench?
2 Answers
An electric wrench with 300 torque is sufficient. An electric wrench refers to an electric tool used for tightening and loosening bolts and nuts, specifically designed for tightening high-strength bolts. It is used for initial tightening, final tightening of large hex head high-strength bolts in steel structure bridges, factory buildings, chemical plants, and power generation equipment installation, as well as for initial tightening of twist-off type high-strength bolts, and in situations where strict requirements are placed on the torque or axial force of bolt fasteners. Introduction to car maintenance: Car maintenance refers to the preventive work of regularly inspecting, cleaning, supplying, lubricating, adjusting, or replacing certain parts of a car, also known as car servicing. Scope of car maintenance: Modern car maintenance mainly includes the maintenance of the engine system, transmission system, air conditioning system, cooling system, fuel system, power steering system, etc. Purpose of car maintenance: The purpose of car maintenance is to keep the car clean and tidy, maintain normal technical conditions, eliminate potential hazards, prevent faults, slow down the deterioration process, and extend the service life.
I've been an auto mechanic for twenty years. The torque for this electric wrench depends on what kind of screw you're tightening. For ordinary family cars when changing tires, 200 to 300 Nm is sufficient—too little won't secure it properly, while too much can strip the threads. But it's different for precision engine components. For instance, valve cover screws shouldn't exceed 20 Nm, and spark plugs usually require 20 to 30 Nm. The key is to consult the repair manual, as torque specifications vary significantly across different car brands. Back when I was an apprentice, I once stripped cylinder head screws by overtightening—the lesson is never to tighten screws based on gut feeling alone.
