四角頭螺絲. SD07. ASME B18.6.2. 錐尾, 杯尾, 圓尾, 狗尾. Working Time: 75 ~ 90 days. 碳鋼,合金鋼. M5~M20, length 300mm MAX (no.10~3/4”, 12” long MAX)
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