常用螺纹加工前底孔尺寸
|
序号
|
螺纹规格
|
钻孔直径
|
孔深
|
孔口倒角
|
螺 距
|
牙形
|
螺纹有效长度
|
|
1
|
1/8-27NPTF
|
φ8.5
|
|
|
|
60°
|
7
|
|
2
|
NPT1/8
|
φ8.6
|
|
|
|
60°
|
7
|
|
3
|
NPT1/4
|
φ11.2
|
|
|
|
60°
|
|
|
4
|
NPT3/8-18
|
φ14.5
|
|
|
|
60°
|
|
|
5
|
NPT1/2-14
|
φ17.9
|
|
|
|
55°
|
|
|
6
|
Rc1/8
|
φ8.3
|
|
|
|
55°
|
|
|
7
|
Rc1/4
|
φ11.1
|
|
|
|
55°
|
|
|
8
|
Rc3/8-19
|
φ15
|
|
|
|
55°
|
|
|
9
|
Rc1/2-14
|
φ18.3
|
|
|
|
55°
|
|
|
10
|
5/16-24UNF
|
比求钻
|
|
|
|
60°
|
|
|
11
|
1/4-18NPTF
|
φ11.12
|
|
|
|
60°
|
|
|
12
|
3/8-18NPTF
|
φ14.27
|
|
|
|
60°
|
|
|
13
|
G1/4-19
|
φ11.6
|
|
|
|
55°
|
|
|
14
|
G3/8-19
|
φ15.2
|
|
|
|
55°
|
|
|
15
|
N0.6-32UNF
|
φ2.85
|
|
|
|
60°
|
|
|
16
|
N0.10-32UNF
|
φ4.1
|
|
|
|
60°
|
|
|
