screw
DIN912有頭內六角螺絲
SCREW_A01
六角承窩螺絲，為其學名，一般稱『圓頭內六角螺絲』、『有頭內六角螺絲』或『套筒螺絲』，常用於機械業高拉力鎖附，通常用中碳或鉻鉬合金鋼製造成，根據用途而有級數的分別，常見的12.9級外，尚有8.8、10.9級。
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