螺纹底孔直径对照表

1、螺纹底孔直径对照表公制普通粗牙螺纹螺纹代号钻头直径HSS硬质合金M2X 0.41.61.65M3X 0.52.52.55M4X 0.73.33.4M5X 0.84.24.3M6X 1.05.05.1M8X 1.256.86.9M10X 1.58.58.7M12X 1.7510.310.5M14X 2.012.012.2M16< 2.014.014.2M18X 2.515.515.7M20X 2.517.517.7M24X 3.021.0M30X 3.526.5M36< 4.032.0M42X 4.537.5M45X 4.540.5M48X 5.043.0公制细牙螺纹螺纹代号钻头直径

2、HSS硬质合金M2X 0.251.751.75M3X 0.352.72.7M4X 0.53.53.55M5X 0.54.54.55M6X 0.756.36.35M8X 1.077.1M8X 0.757.37.35M10X 1.099.1M10X 1.258.88.9M10X 0.759.39.35M12X 1.510.510.7M12X 1.2510.810.9M12X 1.01111.1M14X 1.512.512.7M14X 1.013.013.1M16X 1.514.514.7M16X 1.015.015.1M18X 1.516.516.7M18X 1.01717.1M20X 2.018

3、18.3M20X 1.518.518.7M20X 1.01919.1M24X 2.022.0M24X 1.522.5M24X 1.023.0M30X 327M30X 228M30X 1.528.5M30X 1.529M36X 3.033.0M36X 234.0M36X 1.534.5M42X 438M42X 339M42X 240M42X 1.540.5M45X 441M45X 342M45X 243M45X 1.543.5M48X 444.0M48X 345.0M48X 246.0M48X 1.546.5攻螺纹前底孔直径的确定攻米制螺坡p<1 mm； dc=dPP>1 mm： d

4、(；=d- C1 jO41 j06) F式中！ P距(mm)；dotii头直径(mm):d嵋纹公称直径(mrr) »攻不通孔螺策钻孔深度=所需蝶孔潼度+0Jd另外，也可查表求得；(1)普通螺纹攻螺纹前底孔的钻头直径蛹坟公 称直径 d螺距 F钻头直径do祷女W 桐、黄嗣细、可施铸铁、第桐2CU 0.251J61 .61.752.5CU52陵2.152.052,1530.5QJ52,52.52.6540.70u53.33,53.33.550£34.14.54.24.5610.754,9瓦255.261.2510.756.665 7J6.777.2101.51.2510.758.

5、4 6Z *9.18.6 3J ?9,212L751洒1.25110.110再10.610.910210。10.71 1喊公 称直径 d娜巨 p钻头直径do将铁、青 铜、黄桐钢、可锻祷铁、紫铜211.312141击12.412洒112.?13213.314161,514.4143114.?152.615.315.51 o215.31SIB1.516.416.6116.?172417.31府217.916201.518.418.£116.?19之三r 19.3炽5219.320221320.420七120.?21320.721221.a22241.522.422活122.?23(2)非

6、螺纹密封的管螺纹攻螺纹前钻底孔的钻头直径，纹公称直径(”)1/81/43/81/23/411 1/41 3/81 1/2每 25.4mm，牙数281919141411111111钻头直径(mrm8.811.715.218.924.430.639.241.345.1(3)英制锥管螺纹和英制锥螺纹攻丝前钻底孔的钻头直径英制锥管螺纹英制锥螺纹公称直径每 25.4mm钻头直径公称直径每 25.4mm钻头直径(")内牙数(mm(")内牙数(mrm1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.31/21417.93/414