4 mm Mild Steel Hexagonal Nut is designed to be used with a bolt or a threaded rod to create a strong, secure joint. The 4 mm size refers to the diameter of the nut's threaded hole, which is compatible with a 4 mm diameter bolt or threaded rod. The hexagonal shape of the nut makes it easy to grip with a wrench or pliers for tightening or loosening, and the mild steel material provides strength and durability. 4 mm Mild Steel Hexagonal Nut finds usage in automotive and construction industry, industrial machinery, electrical equipment, plumbing and piping systems.