Is turning a car screw clockwise tightening or loosening it?

[Paislee]

Turning a car screw clockwise tightens it. Below is relevant information about car screws: 1. Design rationale: The reason most screws use right-hand threads is based on ergonomic principles - the velocity direction relative to the rotating shaft follows the right-hand rule. Since over 90% of people are right-handed, this design accommodates the majority. Right-hand threads are also more convenient for machining, especially for large-thread turning operations. 2. Precautions: Screws serve as crucial fasteners in vehicles. The tightness and tightening sequence of important fasteners must be strictly followed, otherwise safety hazards may occur.