This SAE Recommended Practice covers methods for measuring, classifying, and specifying decarburization in the threaded section of hardened and tempered steel bolts, screws, studs, and similar parts. It is not intended to cover products which are specifically carburized to achieve special properties.
SAE J 121-1997由美国机动车工程师协会 US-SAE 发布于 1997-04-01。
SAE J 121-1997 在中国标准分类中归属于: T31 紧固件,J13 紧固件,在国际标准分类中归属于: 21.060.10 螺栓、螺钉、螺柱,43.040.01 道路车辆装置综合,77.080.20 钢。
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