产品名称10级 GB6170六角厚螺母标准GB6170材质45#钢表面处理达克罗其他无需
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国标GB /T13806.1-1992 GB13806.1 13806.1GB 精密机械用
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国标GB /T3098.7-2000 GB3098.7 3098.7GB 紧固件机械性能
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国标GB /T3098.21-2014 GB3098.21 3098.21GB 紧固件机械
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国标GB /T3103.3-2000 GB3103.3 3103.3GB 紧固件公差 平垫
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国标GB /T891-1986 GB891 891GB(GB891-1976) 螺钉紧固轴