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合金结构钢（相当于我国３５ＣｒＭｏ钢）制螺栓用于空调压缩机内连接气缸体与气缸盖，在生产线上用气动搬手装配时相当部分发生断裂。失效分析结果表明，机加工时螺纹根部及表面形成微裂纹，以及回火不足，硬度偏高，共同造成了螺栓失效。
Alloy structural steel (equivalent to China 35CrMo steel) bolts for air-conditioning compressor connected cylinder block and cylinder head, the production line with a pneumatic handle quite a part of the assembly when the rupture. The results of failure analysis show that micro-cracks are formed on the root and the surface of the screw thread during machining, as well as insufficient tempering and high hardness, which together result in failure of the bolt.