攻丝底孔深度比丝深要深多少?
m10的丝深20mm,钻头打底孔深是27mm,
攻盲孔(不通孔)的螺纹时,因丝锥不能攻到底,所以孔的深度要大于螺纹的长度,盲孔的深度可按下面的公式计算:
孔的深度=所需螺纹的深度+0.7d
公称直径d,通孔拧入深度h,盲孔拧入深度h,攻丝深度h1,
3,8,6,7.
4,10,8,10.
5,12,10,12.
6,15,12,15.
8,20,26,18.
10,24,20,23.
12,28,24,27.
16,36,32,36.
20,45,40,45.
24,55,48,54.
30,70,60,67.
36,80,72,80.
42,95,85,94. 20210311