但是仔细想一想，问题就来了，螺母一定要做成六角形的原因是什么呢？
But thinks carefully, the question has come, what can the nut certainly make the hexagon the reason is?
手轮下面是一个六角形外螺纹横膈膜止动螺母。
六角形的螺母，一次只需要把扳手扳动60度，就能够慢慢把螺母拧紧。
Six angular nuts, one time only need the spanner to move 60 degrees, can screw tight slowly the nut.
六角形的螺母，一次只需要把扳手扳动60度，就能够慢慢把螺母拧紧。
Six angular nuts, one time only need the spanner to move 60 degrees, can screw tight slowly the nut.
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