Precautions when tightening hex nuts with a torque wrench

1. Follow safe operating procedures: Wear appropriate personal protective equipment, such as gloves, goggles, etc. to prevent accidental injuries. During operation, pay attention to the surrounding environment and personnel to avoid the torque wrench or other tools from causing harm to others.
2. Do not exceed the maximum range of the torque wrench: Exceeding the maximum range may damage the internal mechanism of the torque wrench, resulting in inaccurate measurement or the wrench not working properly. If the torque required to tighten the nut exceeds the range of the torque wrench, a torque wrench with a larger range should be selected or other appropriate methods should be used to tighten the nut.
3. Avoid shock and vibration: When using a torque wrench, avoid shock or vibration to avoid affecting the accuracy of the torque and the performance of the wrench. Do not use the torque wrench as a hammer or other tool, and do not strike or collide it when the torque wrench is in the tightening state.
4. Regularly calibrate and maintain the torque wrench: To ensure the accuracy and reliability of the torque wrench, it should be calibrated and maintained regularly according to the manufacturer's recommendations. The calibration cycle may vary depending on factors such as the type of torque wrench, frequency of use, and working environment. During use, if the torque wrench reading is found to be inaccurate or abnormal, it should be calibrated or repaired in time.
5. Consider the impact of temperature and humidity: Extreme temperature and humidity conditions may affect the performance of the torque wrench. In a high temperature environment, the material of the torque wrench may expand, resulting in a slight change in the torque value; in a humid environment, moisture may enter the wrench, affecting its electrical performance or causing rust. Therefore, when using a torque wrench, try to avoid operating it under extreme temperature or humidity conditions. If it cannot be avoided, take appropriate protective measures and make appropriate corrections to the torque value when necessary.
6. Pay attention to the quality of nuts and bolts: Make sure that the hexagonal nuts and bolts used meet the design requirements and quality standards. Factors such as the material, hardness, and precision of nuts and bolts will affect the tightening effect and the reliability of the connection. If the nuts or bolts are defective, worn, or damaged, it may cause inaccurate tightening torque or loose connection. Therefore, the nuts and bolts should be checked before installation and replaced in time if there are any problems.
7. For nuts and bolts with special requirements, follow specific tightening methods: Some special nuts and bolts (such as high-strength bolts, large hexagon head bolts, etc.) may require specific tightening methods or sequences, such as step-by-step tightening, symmetrical tightening, initial tightening and final tightening, etc. In this case, tightening should be carried out in strict accordance with relevant technical specifications and operating procedures to ensure the quality and safety of the connection. In addition, for nuts and bolts in some key parts, additional inspections and tests may be required, such as torque coefficient detection, tensile tests, etc.