螺絲 攻下孔徑. ○ 公制粗牙螺紋Metric Coarse Screw Threads ... No.4-40 UNC ... 1-8 UNC. 22.2. 22.5(85%). 21.971. 22.606. 1 1/8-7 UNC. 25.0. 25.2(85%).
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