stay bolt meaning

noun
  A bolt or rod binding together opposite plates

[Architecture]

A long metal rod having a threaded end.

Examples

1. common short stay bolt
2. The increased fuel usage at low speeds caused the firebox to run hotter, which sometimes caused stay bolts to break.
3. When a low water condition allowed the crown sheet to overheat, the stay bolts holding the crown sheet would fail with little warning, resulting in a boiler explosion.
4. And, like the Class 45s, the boilers developed cracks, leaky tubes and popped stay bolts, so that the locomotives were unconvincing when hauling measurement vehicles or scheduled trains.