公称直径d粗6细粗10细粗14细粗18细粗22细粗27细粗33细螺距t10.751.51.2510.7521.51.2512.521.512.521.51321.513.5321.5公称直径钻头直径d55.28.58.799.211.912.512.71315.415.916.51719.419.920.5212424.925.52629.329.930.931.58粗细粗12细粗16细粗20细粗24细粗30细粗36细螺距t1.2510.751.751.51.25121.512.521.51321.513.521.514321.5钻头直径6.777.210.210.510.71113.814.51517.417.918.51920.921.922.52326.427.928.5293232.933.934.52009.12.29
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