A check bolt for alternating load

The utility model relates to a check bolt for alternating load, including the bolt head, the bolt head below sets gradually the glazed traveller body and threaded cylinder, bolt head, smooth cylinder, threaded cylinder integration shaping, threaded cylinder is last to have opposite vertex nut no. 1 and opposite vertex nut no. 2 from last to looping through down screw -thread fit, the bulge of opposite vertex nut no. 2 adopts the taper fit assembly on opposite vertex nut no. 1, be provided with symetric groove on the bulge of opposite vertex nut no. 2, the utility model discloses on the anti -loose method of traditional nut opposite vertex, through adding a taper fit above the nut of opposite vertex to open four symetric groove on the tapering of one of them nut, carry out the adjustment of fit clearance, added an adjustable tapering promptly, under the alternating load condition, can with the screw thread of embracing tightly, play locking effect in elastic range. Under the dual prevention of loosening the de