[EricH]

Originally Posted by StevenB

As you mentioned, <R92> part S allows "Mechanical hardware (i.e. screws, bolts, etc). Pending clarification in the Q&A, I wouldn't completely rule out hinges as hardware. The hardware store calls them hardware, and you find them stocked pretty close to the screws and bolts.
See this thread for more discussion.

But being close is not being equal. 5 is close to 4...

The specific examples in the rule tend to point towards fasteners, not springs and hinges (motion parts, we could call them).