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4mm

Metric Fasteners

Metric 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.

Shoulder bolt

Shoulder bolts

Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.