Abstract: A crossover button, in combination with a ball nut and screw assembly, has a generally Z-shaped body with a section received within a radial bore in the nut. The body has an axially diagonal, raceway turn bridging, ball crossover recirculation passage in its radially inner face which separates portions of a pair of adjacent raceway turns into ball path portions and non-ball path portions external to the ball path portions. The passage has entrances for different turns communicating with the ball path portions. Incorporated with the body are a pair of oppositely helically extending, integrated, normally non-load bearing legs, projecting laterally in a direction away from the passage entrances adjacent opposite ends of the passage in generally parallel lateral planes, which are received in the adjacent non-ball path portions of both the complemental nut and screw helicoidal grooves out of the path of the train of load bearing balls to function to prevent free-wheeling in the event of ball train failure.