Acorn Nut vs. Hex Nut
Both thread onto a bolt end, but an acorn nut caps it with a domed cover that hides the threads.
| Feature | Acorn Nut | Hex Nut |
|---|---|---|
| Appearance | Domed cap hides the thread end | Open — thread end visible |
| Threads | Blind, capped interior | Through-threaded |
| Safety | Covers sharp or damaged bolt ends | Exposed ends can snag |
| Clamping | Same as a hex nut | Standard |
| Best for | Visible, finished assemblies; handrails | General bolting |
Verdict
Use acorn nuts wherever a bolt end is exposed to hands or eyes — handrails, guards, and furniture. A standard hex nut is for everywhere else.