Traditional hydraulic wrench thread detection method is the use of thread gauge contact or use of universal tool microscope for manual measurement, heavy workload, work efficiency and efficiency of the rules of low, the measurement results vulnerable to man-made effects. In the contact measurement, thread gauge easy to wear, thus affecting the measurement accuracy, the cost of replacement gauge is also high.

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According to the shape of the plane graphics, hydraulic wrench threads can be divided into triangular, rectangular, trapezoidal and serrated threads. According to the winding direction of the helix, can be divided into left-hand thread and right-hand thread, the provisions of the thread upright helix up to the right-hand thread, left to left-hand thread. The general use of machinery manufacturing right-handed thread, there are special requirements, only the use of left-hand thread. According to the number of spirals, can be divided into single-thread and isometric arrangement of multi-thread. In order to facilitate the manufacture, the thread is generally not more than 4 lines.