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#4-40, Stainless steel 18-8

US Fasteners, #4-40, Stainless steel 18-8

Hex bolt

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 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.

Set screw

Set screws

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

Nut

Nuts

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