hardened steel bushing
... steel bushing box cofferdam 钢套箱围堰 hardened steel bushing 淬硬钢衬套 ; 淬火钢衬套 Stary Steel Bushing 安稳钢套 ...
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它基本上由在淬硬钢衬套下将零件夹持到位的夹持装置组成，钻孔作业中钻头穿过这些衬套，通过它们来导向。
Basically it consists of a clamping device to hold the part in position under hardened-steel bushings through which the drill passes during the drilling operation. The drill is guided by the bushings.
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