18-8, #2

US Fasteners, 18-8, #2
Sheet metal screws Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood.	Machine screws Screws with machine threads for use with a nut or in a tapped hole.
Set screws Screws with no head and machine threads for use in a tapped hole.	Nuts Nuts have internal machine threads, for use with machine thread bolts and screws.