Stainless steel black oxide finish

US Fasteners

Machine screw

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.
Socket product

Socket screws

Screws with an allen wrench drive.
Nut

Nuts

Nuts have internal machine threads, for use with machine thread bolts and screws.
Washer

Washers

Used to spread the load of a bolt or screw over a larger area or to help prevent loosening under vibration.