挤压丝攻底孔纹公称尺寸推荐钻头直径最小直MxP1=1I,小D径最大直径M2x0.41.831.811.85M2.2x0.452.001.982.03M2.5x0.452.302.282.33M3x0.52.782.762.81M4x0.73.683.653.70M5x0.84.634.594.66M6x15.535.485.57M7x16.536.486.57M8x1.257.397.347.41M8x17.537.487.57M10x1.59.249.189.28M10x1.259.399.349.41M10x19.539.489.57螺纹公称尺推荐寸钻头直径最小MxPD直径最大直径M12x1.7511.1211.0511.15M12x1.511.2411.1811.28M12x1.2511.3911.3411.41M14x213.0012.9213.04M14x1.513.2713.2113.30M16x215.0014.9215.04M16x1.515.2715.2115.30M18x2.516.7316.6316.78M18x1.517.2817.2217.31M20x2.518.7318.6318.78M20x119.2819.2219.31。