GB T 70.1-2008 内六角圆柱头螺钉
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GB T 70.3-2023 降低承载能力内六角沉头螺钉
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GB T 70.6-2020 内六角圆柱头螺钉 细牙螺纹
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GB T 73-2017开槽平端紧定螺钉
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GB T 90.1-2023 紧固件 验收检查
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GB T 90.2-2002 紧固件标志与包装
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GB T 699-2015 优质碳素结构钢
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GB T 845-2017十字槽盘头自攻螺钉
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