... washer 垫圈 self-tapped screw 自攻螺丝 screw bolt assembly 螺栓组件 ...
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self-tapped screw 自攻螺丝
AO self-tapped cortical screw AO自身攻丝螺钉
tapped cortical screw 攻丝螺钉
The bottom side of the line plate shall be cleaned up (no oil stains), and all the screw holes on the plate shall be tapped with screw taps.
线条板底侧面清洁干净(不能有油污)，板上螺丝孔全部用丝攻攻牙一次。
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