What is the correct way to use a wrench?

[RicardoRose]

The correct method for using a wrench is as follows: I. Type A (integral) torque wrench. 1. Setting the torque value. (1) Rotate the locking handle counterclockwise to loosen the adjustment wheel. (2) Turn the adjustment wheel so that the sum of the main scale and the auxiliary scale (adjustment wheel scale) readings equals the required torque value. (3) After setting the torque value, tighten the locking handle clockwise to complete the torque setting. 2. Insert the wrench square drive into a socket of the corresponding size. 3. Fit the socket onto the nut or bolt head. 4. Apply force evenly in the clockwise direction. 5. When a 'click' sound is heard or the wrench feels like it's releasing force, the set torque value has been reached. 6. When tightening long bolts or nuts such as oil pipes where a socket cannot be used, it is necessary to switch to an open-end head. (1) Press the positioning pin at point A as shown in Figure 3 and apply force in the direction of removal to detach the wrench head. (2) Insert the selected open-end head of the corresponding size into the wrench handle and rotate it so that the positioning pin snaps into the small hole of the wrench head for positioning. II. Type B (split) torque wrench. 1. Installation: As shown in Figure 4, first insert the connecting socket component into the wrench head hole and rotate it so that the positioning pin snaps into the wrench hole for positioning. Similarly, connect socket component II to connecting socket component 1 via the positioning pin to complete the assembly. 2. Setting the torque value. (1) Torque wrench with rear cover. a. Press the rear cover positioning pin and remove the rear cover. b. Insert the adjustment tool into the tail adjustment bolt and turn the adjustment handle so that the sum of the main scale reading and the auxiliary scale reading equals the required torque value. c. Remove the adjustment tool, install the rear cover, and ensure the positioning pin snaps into the rear cover hole. (2) Torque wrench with adjustment wheel: a. The torque setting method is the same as for Type A torque wrench. b. Apart from the installation and torque setting differences, the remaining operational steps for Type B torque wrench are the same as steps 2-6 for Type A.