F16B 21/183

Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it ; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, {i.e. resilient in the plane of the ring or the like}; Details {internal, i.e. with spreading action}