1. Listen to the sound: Gently tap the nut. A crisp sound indicates it's tight; a dull sound or rattling noise may indicate it's loose.
2. Check the exposed bolt length: The standard is 2-3 threads (approximately 2-3mm) exposed above the nut. Adjust if too long or too short.
3. Visual inspection: Offset or deformed markings (if present) indicate looseness.
Replace the nut if it has rust, cracks, or thread damage.
4. Anti-loosening test:
Double nuts: Check if the opposing nuts maintain pressure.
Self-locking nuts: Confirm that the nylon washer or embossed teeth are engaged.
Torque wrench: Test if the preload is sufficient.
