攻螺纹前钻孔用 钻 头 直 径

攻螺纹前钻孔用 钻 头 直 径 攻丝前钻孔用麻花钻直径(摘自JB/Z228-85)(细牙普 通螺纹)mm 内螺纹小径内螺纹小径内螺纹小径内螺纹小径D1公称直径D 螺距P 麻花钻直径d D1(5Hmax) D1(5Hmax) D1(5Hmax) (5H/6H/7Hmin) 2.5 0.35 2.201 2.221 - 2.121 2.15 3.0 0.35 2.701 2.721 - 2.621 2.65 3.5 0.35 3.201 3.221 - 3.121 3.10 4.0 0.5 3.571 3.599 3.639 3.459 3.50 4.5 0.5 4.071 4.099 4.139 3.959 4.00 5.0 0.5 4.571 4.599 4.639 4.459 4.50 5.5 0.5 5.071 5.099 5.139 4.959 5.00 6.0 0.75 5.388 5.378 5.424 5.188 5.20 7.0 0.75 6.388 6.378 6.424 6.188 6.20 8.0 0.75 7.388 7.378 7.424 7.188 7.20 9.0 0.75 8.388 8.378 8.424 8.188 8.20 10.0 0.75 9.388 9.378 9.424 9.188 9.20 11.0 0.75 10.388 10.378 10.424 10.188 10.20 8.0 1 7.107 7.153 7.217 6.917 7.00 9.0 1 8.107 8.153 8.217 7.917 8.00 10.0 1 9.107 9.153 9.217 8.917 9.00 11.0 1 10.107 10.153 10.217 9.917 10.00 12.0 1 11.107 11.153 11.217 10.917 11.00 14.0 1 13.107 13.153 13.217 12.917 13.00 15.0 1 14.107 14.153 14.217 13.917 14.00 16.0 1 15.107 15.153 15.217 14.917 15.00 17.0 1 16.107 16.153 16.217 15.917 16.00 18.0 1 17.107 17.153 17.217 16.917 17.00 20.0 1 19.107 19.153 19.217 18.917 19.00 22.0 1 21.107 21.153 21.217 20.917 21.00 24.0 1 23.107 23.153 23.217 22.917 23.00 25.0 1 24.107 24.153 24.217 23.917 24.00 27.0 1 26.107 26.153 26.217 25.917 26.00 28.0 1 27.107 27.153 27.217 26.917 27.00 30.0 1 29.107 29.153 29.217 28.917 29.00 10.0 1.25 8.859 8.912 8.982 8.647 8.80 12.0 1.25 10.859 10.912 10.982 10.647 10.80 14.0 1.25 12.859 12.912 12.982 12.647 12.80 12.0 1.5 10.612 10.676 10.751 10.376 10.50 14.0 1.5 12.612 12.676 12.751 12.376 12.50 15.0 1.5 13.612 13.676 13.751 13.376 13.50 16.0 1.5 14.612 14.676 14.751 14.376 14.50 17.0 1.5 15.612 15.676 15.751 15.376 15.50 18.0 1.5 16.612 16.676 16.751 16.376 16.50 20.0 1.5 18.612 18.676 18.751 18.376 18.50 22.0 1.5 20.612 20.676 20.751 20.376 20.50 24.0 1.5 22.612 22.676 22.751 22.376 22.50 25.0 1.5 23.612 23.676 23.751 23.376 23.50 26.0 1.5 24.612 24.676 24.751 24.376 24.50 27.0 1.5 25.612 25.676 25.751 25.376 25.50 28.0 1.5 26.612 26.676 26.751 26.376 26.50 30.0 1.5 28.612 28.676 28.751 28.376 28.50 32.0 1.5 30.612 30.676 30.751 30.376 30.50 33.0 1.5 31.612 31.676 31.751 31.376 31.50 35.0 1.5 33.612 33.676 33.751 33.376 33.50 36.0 1.5 34.612 34.676 34.751 34.376 34.50 38.0 1.5 36.612 36.676 36.751 36.376 36.50 39.0 1.5 37.612 37.676 37.751 37.376 37.50 40.0 1.5 38.612 38.676 38.751 38.376 38.50 42.0 1.5 40.612 40.676 40.751 40.376 40.50 45.0 1.5 43.612 43.676 43.751 43.376 43.50 48.0 1.5 46.612 46.676 46.751 46.376 46.50 50.0 1.5 48.612 48.676 48.751 48.376 48.50 52.0 1.5 50.612 50.676 50.751 50.376 50.50 18.0 2 16.135 16.210 16.310 15.835 16.00 20.0 2 18.135 18.210 18.310 17.835 18.00 22.0 2 20.135 20.210 20.310 19.835 20.00 24.0 2 22.135 22.210 22.310 21.835 22.00 25.0 2 23.135 23.210 23.310 22.835 23.00 27.0 2 25.135 25.210 25.310 24.835 25.00 28.0 2 26.135 26.210 26.310 25.835 26.00 30.0 2 28.135 28.210 28.310 27.835 28.00 32.0 2 30.135 30.210 30.310 29.835 30.00 33.0 2 31.135 31.210 31.310 30.835 31.00 36.0 2 34.135 34.210 34.310 33.835 34.00 39.0 2 37.135 37.210 37.310 36.835 37.00 40.0 2 38.135 38.210 38.310 37.835 38.00 42.0 2 40.135 40.210 40.310 39.835 40.00 45.0 2 43.135 43.210 43.310 42.835 43.00 48.0 2 46.135 46.210 46.310 45.835 46.00 50.0 2 48.135 48.210 48.310 47.835 48.00 52.0 2 50.135 50.210 50.310 49.835 50.00 30.0 3 27.152 27.252 27.382 26.752 27.00 33.0 3 30.152 30.252 30.382 29.752 30.00 36.0 3 33.152 33.252 33.382 32.752 33.00 39.0 3 36.152 36.252 36.382 35.752 36.00 40.0 3 37.152 37.252 37.382 36.752 37.00 42.0 3 39.152 39.252 39.382 38.752 39.00 45.0 3 42.152 42.252 42.382 41.752 42.00 48.0 3 45.152 45.252 45.382 44.752 45.00 50.0 3 47.152 47.252 47.382 46.752 47.00 52.0 3 49.152 49.252 49.382 48.752 49.00 42.0 4 38.145 38.270 38.420 37.670 38.00 52.0 4 48.145 48.270 48.420 47.670 48.00 45.0 4 41.145 41.270 41.420 40.670 41.00 48.0 4 44.145 44.270 44.420 43.670 44.00