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螺纹的种类 |
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螺纹与接头管接头要求不漏气，拆装方便，可重复使用，由于世界各地区采用螺纹的制式不同，对阀、气缸等气动元件的连接造成不便。如对于英制标准管牙G螺纹，在连接过程中必须采用密封垫圈。但对于圆锥管R螺纹，则不需要密封垫。而且各种制式螺纹有些不能混用。因此，在气动系统设计、选用时必须注意这一细节 按螺纹的种类分为：圆锥管螺纹(R)、公制螺纹(M)、英制标准管牙G(BSP)、美国国家管用螺纹(NPT)、美国标准细牙螺纹(UNF) |
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G(BSP) 英制标准管牙 |
M 公制螺纹 |
UNF美国、英国、 加拿大常用英制 标准细牙螺纹 |
NPT美国国家管 用螺纹(斜牙， 主要用于美国) |
内径 |
外径 |
螺距和每英寸 螺纹数 |
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M3 |
|
|
2.4~2.5 |
2.8~2.9 |
0.5 |
|
|
|
10/32 |
|
4.0~4.2 |
4.6~4.8 |
32 |
|
|
M5 |
|
|
4.1~4.3 |
4.8~4.9 |
0.8 |
|
G1/8 |
|
|
|
8.5~8.9 |
9.3~9.7 |
28TPI |
|
|
|
|
1/8 |
8.5~8.9 |
9.3~9.7 |
29TPI |
|
|
M10×1 |
|
|
8.9~9.2 |
9.7~9.9 |
1.0 |
|
|
M10×1.25 |
|
|
8.6~8.9 |
9.7~9.9 |
1.25 |
|
|
M10 |
|
|
8.4~8.7 |
9.7~9.9 |
1.5 |
|
|
|
7/16-20 |
|
9.7~10.0 |
10.9~11.1 |
20TPI |
|
|
M12×1.25 |
|
|
10.6~ |
11.7~11.9 |
1.25 |
|
|
M12×1.5 |
|
|
10.4~ |
11.7~11.9 |
1.5 |
|
|
M12 |
|
|
10.1~10.4 |
11.6~11.9 |
1.75 |
|
|
|
½-20 |
|
11.3~11.6 |
12.4~12.7 |
20TPI |
|
G¼ |
|
|
|
11.4~11.9 |
12.9~13.1 |
19TPI |
|
|
|
|
¼ |
11.4~11.9 |
12.9~13.1 |
18TPI |
|
|
M14×1.5 |
|
|
12.2~12.6 |
13.6~13.9 |
1.5 |
|
|
|
9/16-18 |
|
12.7~13.0 |
14.0~14.2 |
18TPI |
|
|
M16×1.5 |
|
|
14.4~14.7 |
15.7~15.9 |
1.5 |
|
|
M16 |
|
|
13.8~14.2 |
15.6~15.9 |
2.0 |
|
G38 |
|
|
|
14.9~15.4 |
16.3~16.6 |
19TPI |
|
|
|
|
3/8 |
14.9~15.4 |
16.3~16.6 |
18TPI |
|
|
M18×1.5 |
|
|
16.2~16.6 |
17.6~17.9 |
1.5 |
|
|
M20 |
|
|
17.3~17.7 |
19.6~19.9 |
2.5 |
|
G½ |
|
|
½ |
18.6~19.0 |
20.5~20.9 |
14TPI |
|
|
M22×1.5 |
|
|
20.2~20.6 |
21.6~21.9 |
1.5 |
|
|
|
7/8-14 |
|
20.2~20.5 |
22.0~22.2 |
14TPI |
|
|
|
13/16-12 |
|
27.6~27.9 |
29.8~30.1 |
12TPI |
|
|
|
¾-16 |
|
17.3~17.6 |
18.7~19.0 |
16TPI |
|
|
M24 |
|
|
20.8~21.3 |
23.6~23.9 |
3.0 |
|
|
M26×1.5 |
|
|
24.2~24.6 |
25.6~25.9 |
1.5 |
|
G¾ |
|
|
¾ |
24.1~24.5 |
26.1~26.4 |
14TPI |
|
|
|
11/16-12 |
|
24.3~24.7 |
26.6~26.9 |
12TPI |
|
|
M30×1.5 |
|
|
28.2~28.6 |
29.6~29.9 |
1.5 |
|
|
M30×2 |
|
|
27.4~27.8 |
29.6~29.9 |
2 |
|
|
M32×2 |
|
|
29.4~29.9 |
31.6~31.9 |
2 |
|
G1 |
|
|
|
30.3~30.8 |
33.0~33.2 |
11TPI |
|
|
|
15/16-12 |
|
30.8~31.2 |
33.0~33.3 |
12TPI |
|
|
|
|
1 |
30.3~30.8 |
32.9~33.4 |
11.5TPI |
|
|
M36×2 |
|
|
33.4~33.8 |
35.6~35.9 |
2 |
|
|
M38×1.5 |
|
|
36.2~36.6 |
37.6~37.9 |
1.5 |
|
|
|
15/8-12 |
|
38.7~39.1 |
40.9~41.2 |
12TPI |
|
|
M42×2 |
|
|
39.4~39.8 |
41.6~41.9 |
2 |
|
G1¼ |
|
|
|
39.0~39.5 |
41.5~41.9 |
11TPI |
|
|
|
|
1¼ |
39.2~39.6 |
41.4~42.0 |
11.5TPI |
|
|
M45×1.5 |
|
|
43.2~43.6 |
44.6~44.9 |
1.5 |
|
|
M45×2 |
|
|
42.4~42.8 |
44.6~44.9 |
2 |
|
|
|
17/8-14 |
|
45.1~45.5 |
47.3~47.6 |
12TPI |
|
G1½ |
|
|
|
44.8~45.3 |
47.4~47.8 |
11TPI |
|
|
|
|
1½ |
45.1~45.5 |
47.3~47.9 |
11.5TPI |
|
|
M52×1.5 |
|
|
50.2~50.6 |
51.6~51.9 |
1.5 |
|
|
M52×2 |
|
|
49.4~49.6 |
51.6~51.9 |
2 |
|
G2 |
|
|
|
56.7~ |
59.3~59.6 |
11TPI |