Why don't 4S shops use torque wrenches?

[GrantRose]

4S shops do not use torque wrenches because the torque is not accurate. They can only tighten by the number of turns. The following is an introduction to torque wrenches: 1. Introduction: A torque wrench, also known as a torque spanner, moment wrench, or torque tool, is a type of wrench generally divided into two categories: electric torque wrenches and manual torque wrenches. 2. Principle: Torque is the product of force and distance. When tightening threaded fasteners such as screws, bolts, and nuts, it is necessary to control the applied torque to ensure the fastener is secure without damaging the threads due to excessive torque. Hence, a torque wrench is used for this operation. 3. Application: Torque wrenches are used to tighten bolts. High-strength bolts can be divided into two types: twist-off type and large hexagon type. According to national standards, the twist-off type high-strength bolts include M16, M20, M22, and M24.