内螺纹底孔规格

管螺纹底孔 8.8
11.7
15.2
18.9
20.8 24.3 28.1 30.5 35.2 39.2 41.6 45.1
51
备注 只用与管螺纹
只用与管螺纹
M12X1.75 M12X1.5
10.531-10.106 Φ10.2 10.676-10.376 Φ10.5
备注
M14X1.75 M14X1.5
M16X2 M16X1.5
百度文库
12.31-11.835 Φ11.9 12.676-12.376 Φ12.5
14.31-13.835 Φ13.9 14.676-14.376 Φ14.5
Φ15.4 Φ15.9 Φ16.5
17.854-17.294 18.210-17.835 18.676-18.376
Φ17.4 Φ17.9 Φ18.5
19.854-19.294 20.676-20.376 20.21-19.835
Φ19.4 Φ20.5 Φ19.9
21.382-20.752 Φ20.9 22.210-21.835 Φ21.9
常见英制攻螺纹前钻底孔钻头直径
英制底孔
3.7 5.1 6.4/6.5 7.8/7.9 9.2 10.4/10.5 12/12.1 13.3/13.5 16.3/16.4 19.1/19.3 21.9/22 24.6/24.7 27.8/27.9
33.4/33.5 35.7/35.8 38.9/39 41.4/41.5 44.6/44.7
M18X2.5 M18X2 M18X1.5
M20X2.5 M20X2 M20X1.5
M22X2.5 M22X1.5 M22X2
M24X3 M24X2
M30X3.5 M30X2
M33X3.5 M33X2
M36X4 M36X2
15.854-15.294 16.210-15.835 16.676-16.376
26.921-26.211 Φ26.3 28.210-27.835 Φ27.9
29.921-29.211 Φ29.3 31.210-30.752 Φ30.9
32.420-31.670 Φ31.8 33.252-33.752 Φ33.9
螺纹规格 1/8" 3/16" 1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 7/8" 1" 1 1/8" 1 1/4" 1 3/8" 1 1/2" 1 5/8" 1 3/4" 1 7/8" 2"
螺纹规格 M6X1
M6X0.75
常见公制攻螺纹前钻底孔钻头直径选择
螺纹小径规格 5.217--4.917
5.188
钻头/底孔 Φ5 Φ5.2
M8X1.25 M8X1
6.982-6.647 Φ6.7 7.153-6.971 Φ7
M10X1.5 M10X1.25
8.751-8.376 Φ8.5 8.912-8.647 Φ8.7