Socket Set Screw - Grub

 Allen Hexagon Drive Socket Set Screw Description (Grub Screw)

A set screw is a type of screw generally used to secure an object within or against another object, normally not using a nut. The most common examples are securing a pulley or gear to a shaft. Set screws are usually headless (also called blind), meaning that the screw is fully threaded and has no head projecting past the major diameter of the screw thread. If a set screw has a head, the thread will extend all the way to the head (whereas a bolt might have an unthreaded shank between the head and thread). A grub screw (blind set screw), is almost always driven with an internal-wrenching drive, such as a hex socket (Allen), star (Torx), square socket (Robertson), or slot. The set screw passes through a threaded hole in the outer object and is tightened against the inner object to prevent it from moving relative to the outer object. It exerts compressional or clamping force through the bottom tip that projects through the hole.

Allen Key Sizes

M2 x 0.4mm pitch; allen key size 0.9mm.

M2.5 x 0.45mm pitch; allen key size 1.3mm.

M3 x 0.5mm pitch; allen key size 1.5mm.

M4 x 0.7mm pitch; allen key size 2mm.

M5 x 0.8mm pitch; allen key size 2.5mm.

M6 x 1.0mm pitch; allen key size 3mm.

M8 x 1.25mm pitch; allen key size 4mm.

M10 x 1.5mm pitch; allen key size 5mm.