Stainless steel square nuts are four-sided threaded fasteners with square outer profiles and internal threads, designed to cooperate with bolts to clamp and fasten components together.
Manufactured from 304 or 316 stainless steel, square nuts offer good rust and corrosion resistance for wet and corrosive applications. Their square shape prevents rotation when seated in a square recess or against a flat surface, making installation convenient. Compared with hex nuts, they provide a larger contact area. They are commonly used in wooden structures, railings, machinery fixtures and channel steel assemblies.