Allen, 1.25mm

Metric Fasteners, Allen, 1.25mm
Socket screws Screws with an Allen wrench drive.	Set screws Screws with no head and machine threads for use in a tapped hole.
Threaded inserts & Rivet nuts For adding a machine thread to material that otherwise cannot be tapped.	Shoulder bolts Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.