How many threads should be showing on locking nuts?

The correct response indicates that one thread should be showing on locking nuts for proper installation and functionality. This guideline ensures that the nut is tightened sufficiently while still providing a visual cue of its engagement. Having at least one thread visible signifies that the nut is properly seated and not over-tightened.

If no threads are visible, it could suggest that the nut is either not fully engaged or is excessively tight, which may lead to damage or stripping of the threads. Conversely, if two or three threads are visible, while it may seem acceptable in some contexts, it often indicates that the nut is too loosely fitted, which could compromise its effectiveness in securing the components.

Thus, maintaining one visible thread is a standard practice in mechanical assemblies, ensuring the locking nut functions as intended while allowing for adjustments or inspections as necessary.