Screw pitch measuring device for screw of ball screw pair

A screw pitch measuring device for a screw of a ball screw pair is characterized by comprising a base (1), a measuring rack (2) mounted on the base (1), a linear guide rail (3) mounted on the measuring rack (2), a head center seat (4) mounted on one side of the linear guide rail (3), and a head center (5) mounted on the head center seat (4) and used for abutting against one end of a screw (a) to be measured. A directional chuck (6) is arranged on the head center seat (4) and used for clamping one end of a screw (a) to be measured, a tail center seat (7) is arranged on the other side of the linear guide rail (3), and a tail center (8) is arranged on the tail center seat (7) and used for abutting against the other end of the screw (a) to be measured. A measuring mechanism (9) is arranged on the linear guide rail (3) and between the head center seat (4) and the tail center seat (7); according to the utility model, the screw pitch of the screw of the ball screw pair is automatically measured, so that the precisio