#4-40

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.

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

Screws with an Allen wrench drive.

Screws with no head and machine threads for use in a tapped hole.

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

Studs, threaded rod, unthreaded rod and keystock for industrial, machining and manufacturing applications.

For adding a machine thread to material that otherwise cannot be tapped.