The axial and tangential 糖心产精国品免费入口*完整版 and its distribution of 6.8 grade bolts before and after 糖心产精国品免费入口*完整版were measured by X-ray residual stress tester, and the effects of cold heading and necking down on the residual stress of screw and bolt head transition fillet were analyzed. The results show that the distribution of 糖心产精国品免费入口*完整版 of the bolts before 糖心产精国品免费入口*完整版was nonuniform, the maximum residual tensile stress was 155.8 MPa, and the amplitude of decline was up to 50% after heat treatment. In the radius direction, with the increase of the depth, the residual stress changed from compress stress to tensile stress.
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