How to determine whether a bolt is tightened properly?

Jiaxing Xinhan Technology Co., Ltd. is a screw manufacturer specializing in the production of various fasteners. It is located in the beautiful Haiyan, Zhejiang, with an excellent transportation location.

The core methods for determining whether bolts are tightened include the torque control method, the angle control method, the yield point control method, and observing the state of the spring washer, etc. The specific choice depends on the application scenario and accuracy requirements.

Mainstream tightening judgment method:

1. Torque control method.

Use a torque wrench to measure whether the applied torque value meets the preset standard. The advantage is that it is easy to operate and suitable for conventional scenarios, but the pre-tightening force error is relatively large (±25%).

2. Angle control method.

After the initial fitting, rotate and fix at a certain angle (e.g., 30° or 90°), and confirm the pre-tightening force through the angle standard. The precision is relatively high (±15%), which is suitable for high-requirement connections.

3. Yield point control method.

Tighten the bolts to the material yield point, and the pre-tightening force error can be controlled within ±8%, but it requires extremely high quality of the equipment and bolts.