Special gauge for measuring coaxiality between crankshaft hole of cylinder body and outer wall of hole

The utility model relates to a special gauge for measuring the coaxiality between a crankshaft hole of a cylinder body and the outer wall of the hole, and the innovation points are as follows: the special gauge comprises a crankshaft hole rod and a gauge main body which are independent from each other, wherein the gauge main body is a circular sleeve, and a coaxial stepped hole is arranged in the circular sleeve body. The special gauge has simple structure, reasonable design, simpleness and convenience in operation and accuracy in measurement, and can greatly improve the efficiency of detecting the coaxiality between the crankshaft hole of the cylinder body and the outer wall of the hole, the detection efficiency is improved by 5-8 times in comparison with the traditional measurement way, the production efficiency is further effectively improved and the production quality is simultaneously improved.