1、螺紋底孔直徑對照表公制普通粗牙螺紋螺紋代號鉆頭直徑HSS硬質(zhì)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公制細牙螺紋螺紋代號鉆頭直徑

2、HSS硬質(zhì)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攻螺紋前底孔直徑的確定攻米制螺坡p<1 mm； dc=dPP>1 mm： d

4、(；=d- C1 jO41 j06) F式中！ P距(mm)；dotii頭直徑(mm):d嵋紋公稱直徑(mrr) »攻不通孔螺策鉆孔深度=所需蝶孔潼度+0Jd另外，也可查表求得；(1)普通螺紋攻螺紋前底孔的鉆頭直徑蛹墳公 稱直徑 d螺距 F鉆頭直徑do禱女W 桐、黃嗣細、可施鑄鐵、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灑1.25110.110再10.610.910210。10.71 1喊公 稱直徑 d娜巨 p鉆頭直徑do將鐵、青 銅、黃桐鋼、可鍛禱鐵、紫銅211.312141擊12.412灑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熾5219.320221320.420七120.?21320.721221.a22241.522.422活122.?23(2)非

6、螺紋密封的管螺紋攻螺紋前鉆底孔的鉆頭直徑，紋公稱直徑(”)1/81/43/81/23/411 1/41 3/81 1/2每 25.4mm，牙數(shù)281919141411111111鉆頭直徑(mrm8.811.715.218.924.430.639.241.345.1(3)英制錐管螺紋和英制錐螺紋攻絲前鉆底孔的鉆頭直徑英制錐管螺紋英制錐螺紋公稱直徑每 25.4mm鉆頭直徑公稱直徑每 25.4mm鉆頭直徑(")內(nèi)牙數(shù)(mm(")內(nèi)牙數(shù)(mrm1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.31/21417.93/414