Thread Cutting Screws body has a screw body and a thread extending axially along the axial surface of the screw body, the screw body near the bottom edge of the screw is equipped with grooves, the grooves and the center line of the screw body to form a tilt angle, the grooves with the tilt angle change, the groove end face of the thread is stepped, so that when locking the object, so that the grooves at the end of the screw tapping into the wall of the object in order to enable the screw body threads The threads of the screw body can be quickly tapped into the wall of the object and the locking force of the screw body can be reduced.

割尾螺钉具有一个螺丝本体及一个沿螺丝本体轴面轴向延伸的螺纹，该螺丝本体靠近底缘处的螺丝上开设有槽沟，该槽沟与螺丝本体中心线形成一个倾斜夹角，该槽沟随著倾斜角度变化，使槽沟端面的螺纹呈阶梯状，以便在锁合物件时，使槽沟端面处的螺纹依序螺合攻入物件壁面，藉使螺丝本体的螺纹快速攻纹锁合，以及达到减少螺丝本体锁合施力的功效