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在机械维修中，内六角扳手是使用频率较高的工具之一，而我们又常常会碰到没有内四、六角螺钉扳手的情况。因此，我采用对应的外四、六角螺钉来代替。代替的方法是，Ｍ１０的内六角螺钉可选用Ｍ５的外六角螺钉；Ｍ１２的内六角螺钉可选用Ｍ６的外六角螺钉；Ｍ２０的可选ＭＳ；
In the mechanical maintenance, the hex wrench is one of the tools used frequently, and we often encounter no four, hex wrench screw situation. Therefore, I use the corresponding outer four, hex screws instead. The alternative method is that M10 hexagon socket head cap screws can be used for M10 hexagon socket head screws; M12 hexagon socket head cap screws can be used for socket head cap screws of M12; M20 optional MS;