各种标准螺纹螺距底孔

螺丝攻下孔径对照表公制粗牙螺纹( (M公制粗牙螺纹 (M) M)规格M1M1.1M1.2M1.4M1.6M1.7M1.8M2M2.2M2.3M2.5M2.6M3M3M3.5M4M4M4.5M5M5M6