发布时间:2025-01-19 02:28:42
1、自攻螺钉重量一般按照每千件的重量计算,具体见下表:
2、自攻螺钉,英文名为Self-tapping Screw 是在金属或非金属材料之预钻孔中自行攻钻出所配合阴螺纹之一种有螺纹扣件。自攻螺钉多用于薄的金属板(钢板、锯板等)之间的连接。连接时,先对被连接件制出螺纹底孔,再将自攻螺钉拧入被连接件的螺纹底孔中。由于自攻螺钉的螺纹表面具有较高的硬度(≥45HRC),可在被连接件的螺纹底孔中攻出内螺纹,从而形成连接。
家里的花上最近总是出现这样的虫子红色很硬到处都是周围的花和窗户上全都是不飞动请问这是什
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