ISO 8139: Rod-end spherical eye

ISO 8139 defines the mounting dimensions of a rod-end spherical eye for pneumatic cylinders, which is used as a rod-end attachment for load attachment. Rod-end spherical eyes are also commonly called rod-end eyes and use female threads to attach to a male threaded piston rod. A pin and clamp (or clevis) are used to couple a load to the rod-end eye. Rod-end eyes, are suitable for linear (push or pull) and non-linear load travel. This attachment is typically coupled to a female clevis attachment with a pin. This allows the cylinder body to rotate, while the piston rod is applying force to the load. If the force is not applied along the centerline of the cylinder due to misalignment, unwanted forces on the piston rod and bearings can occur. These accessories can compensate for misalignment issues by tilting with cylinder motion.