Headless (Blind) Stainless Steel Set Screw

 

        

Set screws are generally used to secure an object by using compressional or clamping force.  There are different types of point styles available: the most common point is a cup point and is used for quick, permanent and semi-permanent part assemblies; the flat point is used for frequent relocation of parts where minimal shaft deformation is required; the half dog point is often used in place of a dowel pin; the cone point has the highest torsional and axial holding capabilities; and the oval point is used when the point meets the part on an angle. 

Usually, set screws are used to secure a pulley or gear to a shaft.  Most set screws are headless, meaning there is no head projecting past the screw thread.   To fasten two objects in place, a blind set screw is driven through a threaded hole in the outer object and is tightened against an inner object to prevent it from moving relative to the outer object. Often, but not always the friction created by fastening the screw can cause some elastic or plastic deformation of one or both objects.  In the UK the headless set screw is called a grub screw, most likely because of its resemblance to a grub.