square nut

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Noun1.square nut - nut with a square shapesquare nut - nut with a square shape    
nut - a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt
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References in periodicals archive ?
Nut segment is fragmented as hex nut, heavy hex nut, jam nut, square nut, and other nuts.
The bleed valve is the small square nut at the top end of the radiator.
If the metal bends outward, it can't hold the mechanism's square nut in place.
Optional accessories include chainwheel, square nut, stem extension, and bronze bearings.
"Then there is a straight bar with holes in each end that the strap goes through and a square nut screwed on to tighten it.
I fabricate squared bolts by brazing a square nut onto a threaded rod cut to length.