from The Century Dictionary.
- noun In machinery, a bolt or rod binding together opposite plates to enable them to sustain each other against internal pressure.
- noun Specifically, in locomotive-boilers, the bolt screwed into the parallel plates of the water-legs, or the crown-sheet and the wagon-top sheets, riveted over at both ends, and serving to keep each from deformation by pressure.
Sorry, no etymologies found.
An hour later when Miss Northwestern called him for a price on stay-bolt iron she did not ring off for fifteen minutes, and at the end of that time she promised to take the first opportunity of having another chat.