螺纹基本尺寸对照表.docx
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螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55o）BSPP
螺纹代号
基本直径
内螺纹
外螺纹
大径
中径
小径
中径公差
小径公差
级A
B级
中径公差
大径公差
中径公差
大径公差
″×28G1/8
9.728
9.147
8.566
+0.170
+0.2820
0-0.107
0-0.214
0-0.214
0-0.214
″×19G1/4
13.157
12.301
11.445
+0.125
+0.445
-0.125
-0.250
-0.250
0-0.250
″×19G3/8
16.662
15.806
14.950
+0.1250
+0.4450
0-0.125
0-0.250
0-0.250
0-0.250
″×14G1/2
20.955
19.793
18.631
+0.1420
+0.5410
0-0.142
0-0.284
0-0.284
0-0.284
″×14G5/8
22.911
21.749
20.587
+0.1420
+0.5410
0-0.142
0-0.284
0-0.284
0-0.284
″×14G3/4
26.441
25.279
24.117
+0.1420
+0.5410
0-0.142
0-0.284
0-0.284
0-0.284
″×11G1
33.249
31.770
30.291
+0.1800
+0.6400
0-0.180
0-0.360
0-0.360
0-0.360
″×11G1.1/4
41.910
40.431
38.952
+0.1800
+0.6400
0-0.180
0-0.360
0-0.360
0-0.360
″×11G1.1/2
47.803
46.324
44.854
+0.1800
+0.6400
0-0.180
0-0.360
0-0.360
0-0.360
″×11G2
59.614
58.135
56.656
+0.1800
+0.6400
0-0.180
0-0.360
0-0.360
0-0.360
G2.1/2”X11
75.184
73.705
72.226
+0.2170
+0.6400
0-0.217
0-0.434
0-0.434
0-0.434
G3”X11
87.884
86.405
84.926
+0.2170
+0.6400
0-0.217
0-0.434
0-0.434
0-0.434
G3.1/2”X11
100.330
98.851
97.372
+0.2170
+0.6400
0-0.217
0-0.434
0-0.434
0-0.434
英制锥管螺纹基本尺寸及公差（牙形角55o）BSPT
螺纹代号
基面上的直径
基准长度
有效螺纹长度
圆锥内螺纹基面轴向±mm）位移偏差（
大径
中径
小径
基本
最大
最小
基本
最大
最小
″×28R1/8
9.728
9.147
8.566
4.0
4.9
3.1
6.5
7.4
5.6
1.1
″×19R1/4
13.157
12.301
11.445
6.0
7.3
4.7
9.7
11.0
8.4
1.7
″×19R3/8
16.662
15.806
14.950
6.4
7.7
5.1
10.1
11.4
8.8
1.7
″×14R1/2
20.955
19.793
18.631
8.2
10.0
6.4
13.2
15.0
11.4
2.3
″×14R3/4
26.441
25.279
24.117
9.5
11.3
7.7
14.5
16.3
12.7
2.3
″×11R1
33.249
31.770
30.291
10.4
12.7
8.1
16.8
19.1
14.5
2.9
″×11R1.1/4
41.910
40.431
38.952
12.7
15.0
10.4
19.1
21.4
16.8
2.9
″×11R1.1/2
47.803
46.324
44.845
12.7
15.0
10.4
19.1
21.4
16.8
2.9
″×11R2
59.614
58.135
56.656
15.9
18.2
13.6
23.4
25.7
21.1
2.9
R2.1/2”X11
75.184
73.705
72.226
17.5
21.0
14.0
26.7
30.2
23.2
3.5
R3”X11
87.884
86.405
84.926
20.6
24.1
17.1
29.8
33.3
26.3
3.5
R3.1/2”X11．
100.330
98.851
97.372
22.2
25.7
18.7
31.4
34.9
27.9
3.5
美制管螺纹基本尺寸及公差（牙形角60o）UN（F）
螺纹代号
外螺纹
内螺纹
公差等级
公差等级
2A
2B
大径
中径
小径
小径
中径
大径
最大
最小
最大
最小
最小
最大
最小
最大
JIC螺纹
″×20UNF7/16
11.079
10.874
10.254
10.147
9.568
9.728
10.033
10.287
10.424
11.113
″×20UNF1/2
12.667
12.461
11.841
11.732
11.156
11.328
11.608
11.875
12.017
12.7
″×18UNF9/16
14.252
14.031
13.335
13.221
12.573
12.751
13.081
13.371
13.52
14.288
″×16UNF3/4
19.012
18.773
17.981
17.854
17.12
17.323
17.678
18.019
18.184
19.05
″×14UNF7/8
22.184
21.923
21.006
20.869
20.025
20.269
20.676
21.046
21.224
22.225
″×1-1/1612UN
26.944
26.655
25.57
25.425
24.425
24.689
25.146
25.613
25.801
26.988
″×12UN1-5/16
33.294
33.005
31.92
31.773
30.775
31.039
31.496
31.963
32.154
33.338
″×12UN1-5/8
41.229
40.94
39.885
39.705
38.71
38.989
39.446
39.901
40.094
41.275
″×12UN1-7/8
47.579
47.29
46.205
46.053
45.06
45.339
45.796
46.251
46.449
47.625
″×12UN2-1/2
63.452
63.162
62.078
61.92
60.932
61.214
61.671
62.126
62.332
63.5
ORFS螺纹
″×18UNF9/16
14.252
14.031
13.335
13.221
12.573
12.751
13.081
13.371
13.52
14.288
″×16UN11/16
17.427
17.188
16.396
16.274
15.535
15.748
16.104
16.431
16.589
17.463
″×16UN13/16
20.599
20.361
19.568
19.444
18.707
18.923
19.279
19.606
19.766
20.638
″×14UNF1
25.357
25.095
24.178
24.036
23.195
23.444
23.825
24.221
24.407
25.4
″×12UN1-3/16
30.119
29.83
28.745
28.598
27.6
27.864
28.321
28.788
28.979
30.163
″×12UN1-7/16
36.467
36.177
35.093
34.943
33.947
34.214
34.671
35.138
35.331
36.513
″×12UN1-11/16
42.817
42.527
41.443
41.29
40.297
40.564
41.021
41.488
41.686
42.863
″×12UN2
50.754
50.465
49.38
49.225
48.235
48.514
48.971
49.426
49.627
50.8
SAE螺纹
″×18UNF5/8
15.839
15.618
14.923
14.803
14.161
14.351
14.681
14.958
15.11
15.875
″×14UN1-1/16
26.947
26.683
25.743
25.608
24.74
24.968
25.375
25.783
25.961
26.987
其它美制螺纹
″×16UN9/16
14.252
14.013
13.221
13.101
12.36
12.573
12.
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