螺絲 攻下孔徑. ○ 公制粗牙螺紋Metric Coarse Screw Threads. 標稱. Nominalsize. 鉆頭徑. Drill dia. 2級下孔徑 ... M8×1.0. 7. 7.13(80%). 6.917. 7.153. M8×0.75.
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