Hauv kev lag luam khoom kho vajtse, bolts, uas yog ib qho tseem ceeb fastener, ua lub luag haujlwm tseem ceeb hauv ntau yam khoom siv engineering thiab cov khoom siv. Niaj hnub no, peb yuav qhia cov hexagon bolts thiab hexagon bolts, lawv muaj qhov sib txawv tseem ceeb hauv kev tsim thiab siv, thiab cov hauv qab no ...
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