4mm, Zinc plated steel

Metric Fasteners, 4mm, Zinc plated steel
Hex bolts Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.	Machine screws Screws with machine threads for use with a nut or in a tapped hole.
Nuts Nuts have internal machine threads, for use with machine thread bolts and screws.	Threaded inserts & Rivet nuts For adding a machine thread to material that otherwise cannot be tapped.