From stay + bolt
staybolt (plural staybolts)
- a rod with threaded ends, used as a stay in a boiler, firebox etc.
- Code of Federal Regulations, ProStar Publications →ISBN (no publication date given)
At the time of replacement of broken staybolts, adjacent staybolts shall be inspected.
- staybolt at OneLook Dictionary Search
- “stay bolt” in Merriam–Webster Online Dictionary.