Abstract: An improved sucker rod coupling is provided for use in a rod string in a pumping oil well. An elongate, cylindrical body member is utilized. This member has internally threaded, longitudinal bores at each end thereof, for connection with the sucker rods which it is to join. Transversely extending, substantialy diametric, longitudinally spaced apart, vertical slots are formed in the mid-portion of the body member. A wheel is mounted on a horizontally extending pin within each slot, for rotation therein. A portion of the wheel protrudes beyond each side of the body member, to thereby provide an anti-friction roller for the coupling when it contacts and slides against the surrounding tubing wall during reciprocation of the rod string. Preferably, the wheel is spaced from the side walls of the slot, so as to be movable laterally within the slot. This arrangement permits the wheel to shift back and forth on its pin, to thereby expel sand and wax building up between the wheel and the slot walls.