半圆头内六角螺钉 Hexagon head cap screws
钢制：碳钢 级别:10.9
表面处理：发黑、蓝白锌A2K、彩锌A2C、达克罗DAC
不锈钢：A2-70
具体请阅：http://www.ebt-ag.com/Product.aspx?ppid=23
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