螺纹代号
|
每英寸牙数
|
基本直径
|
螺距≈
|
d1h9
|
l+2
l-2
|
L
|
方头
|
|
a
H11
|
l2
|
|||||||
1/16
|
28
|
7.723
|
0.907
|
5.6
|
14
|
52
|
4.5
|
7
|
1/8
|
9.728
|
8
|
15
|
59
|
6.3
|
9
|
||
1/4
|
19
|
13.157
|
1.337
|
10
|
19
|
67
|
8
|
11
|
3/8
|
16.662
|
12.5
|
21
|
75
|
10
|
13
|
||
1/2
|
14
|
20.955
|
1.814
|
16
|
26
|
87
|
12.5
|
16
|
(5/8)
|
22.911
|
18
|
91
|
14
|
18
|
|||
3/4
|
26.441
|
20
|
28
|
96
|
16
|
20
|
||
(7/8)
|
30.201
|
22.4
|
29
|
102
|
18
|
22
|
||
1
|
11
|
33.249
|
2.309
|
25
|
33
|
109
|
20
|
24
|
1 1/4
|
41.910
|
31.5
|
36
|
119
|
26
|
28
|
||
1 1/2
|
47.803
|
35.5
|
37
|
125
|
28
|
31
|
||
(1 3/4)
|
53.746
|
39
|
132
|
|||||
2
|
59.614
|
40
|
41
|
140
|
31.5
|
34
|
||
(2 1/4)
|
11
|
65.710
|
42
|
142
|
||||
2 1/2
|
75.184
|
45
|
45
|
153
|
35.5
|
38
|
||
3
|
87.884
|
50
|
48
|
164
|
40
|
42
|
||
3 1/2
|
100.33
|
63
|
50
|
173
|
50
|
51
|
||
4
|
113.03
|
71
|
53
|
185
|
56
|
56
|
注:丝锥的柄部及其方头尺寸应符合GB/T 4267的规定,对于di.精密柄部公差 为h9,其他柄部公差为h11;方头尺寸a的公差为h1l [h12 (包括了形状和相对于柄 部的位置误差)]。
螺纹代号
|
每英寸牙数
|
基本直径
|
螺距≈
|
d1
h9
|
l+2
l-1
|
L
|
l₁
max
|
方头
|
|
a
H11
|
l₂
|
||||||||
1/16
|
28
|
7.723
|
0.907
|
5.6
|
14
|
52
|
10.1
|
4.5
|
7
|
1/8
|
28
|
9.728
|
8
|
15
|
59
|
10.1
|
6.3
|
9
|
|
1/4
|
19
|
13.157
|
1.337
|
10
|
10
|
67
|
15
|
8
|
11
|
3/8
|
19
|
16.662
|
12.5
|
21
|
75
|
15.4
|
10
|
13
|
|
1/2
|
14
|
20.955
|
2.309
|
16
|
26
|
87
|
20.5
|
12.5
|
16
|
3/4
|
14
|
26.441
|
20
|
28
|
96
|
21.8
|
16
|
20
|
|
1
|
11
|
33.249
|
25
|
33
|
109
|
26.0
|
20
|
24
|
|
1 1/4
|
11
|
41.910
|
31.5
|
36
|
119
|
28.3
|
25
|
28
|
|
1 1/2
|
11
|
47.803
|
35.5
|
37
|
125
|
28.3
|
28
|
31
|
|
2
|
11
|
50.614
|
40
|
41
|
140
|
32.7
|
31.5
|
34
|
|
2 1/2
|
11
|
75.184
|
45
|
45
|
153
|
37.1
|
35.5
|
38
|
|
3
|
11
|
87.884
|
50
|
48
|
164
|
40.2
|
40
|
42
|
|
3 1/2
|
11
|
100.33
|
63
|
50
|
173
|
41.9
|
50
|
51
|
|
4
|
11
|
113.03
|
71
|
53
|
185
|
46.2
|
56
|
56
|
代号NPT
|
每英寸牙数
|
螺距P
|
l₁
|
l
|
L
|
d₁
|
a
|
l₂
|
1/16
|
27
|
0.941
|
11
|
17
|
54
|
8.0
|
6.3
|
9
|
1/8
|
19
|
|||||||
1/4
|
18
|
1.411
|
16
|
27
|
62
|
11.2
|
9
|
12
|
3/8
|
65
|
14
|
11.2
|
14
|
||||
1/2
|
14
|
1.814
|
21
|
35
|
79
|
18
|
14
|
18
|
3/4
|
83
|
22.4
|
18
|
22
|
||||
1
|
11.5
|
2.209
|
26
|
44
|
95
|
28
|
22.4
|
26
|
1 1/4
|
27
|
102
|
35.5
|
28
|
31
|
|||
1 1/2
|
108
|
40
|
31.5
|
34
|
||||
2
|
28
|
108
|
50
|
40
|
42
|