标准查询

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Draft Revision ASME B18.6.3 2002 开槽大六角头和凹穴大六角头螺钉

Plain(Unslotted) and Slotted Regular and Large Hex Head Machine Screws

Draft Revision ASME B18.6.3 2002 开槽大六角头和凹穴大六角头螺钉