What test methods can be used to detect the tightening force of tapping screws?

1. Torque test
Use a torque wrench or torque tester to measure the torque required to tighten or loosen the tapping screws. The torque size can reflect the degree of tightening force.
2. Tensile test
Fix the test piece with tapping screws installed on the tensile tester, apply tension along the screw axis until the screw loosens or is pulled out, and record the maximum tension value to evaluate the tightening force.
3. Push-out test
For tapping screws that connect plates or other components together, a push-out test can be performed. By applying a thrust perpendicular to the screw axis, the force required to separate the connected components is measured.
4. Shear test
Applicable to connections that are subject to shear force, apply shear force to the tapping screws, and measure the maximum shear force it can withstand to determine the tightening force.
5. Vibration test
Submit a vibration test to the test piece with tapping screws installed to observe whether the screws loosen under certain vibration conditions, and indirectly evaluate the durability of the tightening force.
6. Nondestructive testing
For example, ultrasonic testing technology, X-ray testing and other methods can be used to detect the tightening state and connection quality of screws without destroying the test piece.
These test methods can be used to accurately evaluate the tightening force of tapping screws according to specific application scenarios and requirements.