Universal joints manufactured to this specification are intended for naval service. Universal joints are expected to operate during and following shock loadings and are intended to last for the life cycle of the ship or craft. Class A universal joints are intended for general purpose use in mechanical remote control systems. Class B joints are intended for use where corrosive conditions are abnormal or nonmagnetic materials are required. Class C joints are intended for use where corrosive conditions are abnormal or high torque requirements are desired. Current stock of universal joints may be used until depleted, future requisitions for universal joints should refer to the current version of this specification.