Knurled stepped miniature shaft

The utility model discloses a knurled stepped miniature shaft, and relates to the technical field of miniature shafts. The knurled stepped miniature shaft comprises a metal roof body and a ridge, the metal roof body comprises a shaft body, the shaft body is of a cylindrical structure, the length of the shaft body is 150 mm, the diameter of the shaft body is 32 mm, shaft heads are arranged at the two ends of the shaft body, a shaft sleeve is sleeved on the outer surface of the shaft body, the diameter of the shaft heads is equal to that of the shaft sleeve, and the diameter of the shaft heads is larger than that of the shaft body. Threaded holes vertically penetrate through the two ends of the shaft sleeve, and a shaft through hole is formed in the surface of the shaft head and penetrates through the whole shaft body; a third step is arranged in the middle of the shaft body, second steps with the same length are symmetrically arranged on the two sides of the third step, and first steps with the same length are