Stay bolt

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(Mech.) a bolt or short rod, connecting opposite plates, so as to prevent them from being bulged out when acted upon by a pressure which tends to force them apart, as in the leg of a steam boiler.

See also: Stay

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
They discovered what they'd already suspected: In scale models, things don't always work perfectly, because you can't always scale things down exactly, like the stay bolt pitch, flue tubes, valve motion and water leg around the firebox.
Unlike the other hyacinths grown in the test, they managed to stay bolt upright throughout the trial - essential if you're going to use them in the garden, although they looked good in pots too.