2024年3月12日发(作者：郜曼安)
英制管螺纹基本尺寸及公差（牙形角55º） BSPP
基本直径
螺纹代号
内螺纹
A级
大径中径小径中径公差
+0.170
+0.125
+0.125
0
+0.142
0
+0.142
0
+0.142
0
+0.180
0
+0.180
0
+0.180
0
+0.180
0
+0.217
0
+0.217
0
+0.217
0
小径公差
+0.282
0
+0.445
+0.445
0
+0.541
0
+0.541
0
+0.541
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
中径公差
0
-0.107
-0.125
0
-0.125
0
-0.142
0
-0.142
0
-0.142
0
-0.180
0
-0.180
0
-0.180
0
-0.180
0
-0.217
0
-0.217
0
-0.217
大径公差
0
-0.214
-0.250
0
-0.250
0
-0.284
0
-0.284
0
-0.284
0
-0.360
0
-0.360
0
-0.360
0
-0.360
0
-0.434
0
-0.434
0
-0.434
中径公差
0
-0.214
-0.250
0
-0.250
0
-0.284
0
-0.284
0
-0.284
0
-0.360
0
-0.360
0
-0.360
0
-0.360
0
-0.434
0
-0.434
0
-0.434
外螺纹
B级
大径公差
0
-0.214
0-0.250
0
-0.250
0
-0.284
0
-0.284
0
-0.284
0
-0.360
0
-0.360
0
-0.360
0
-0.360
0
-0.434
0
-0.434
0
-0.434
G1/8
″×
28
G1/4
″×
19
G3/8
″×
19
G1/2
″×
14
G5/8
″×
14
G3/4
″×
14
G1
″×
11
G1.1/4
″×
11
G1.1/2
″×
11
G2
″×
11
G2.1/2”X11
G3”X11
G3.1/2”X11
9.728
13.157
16.662
20.955
22.911
26.441
33.249
41.910
47.803
59.614
75.184
87.884
100.330
9.147
12.301
15.806
19.793
21.749
25.279
31.770
40.431
46.324
58.135
73.705
86.405
98.851
8.566
11.445
14.950
18.631
20.587
24.117
30.291
38.952
44.854
56.656
72.226
84.926
97.372
英制锥管螺纹基本尺寸及公差（牙形角55º） BSPT
基面上的直径
螺纹代号
R1/8
″×
28
R1/4
″×
19
R3/8
″×
19
R1/2
″×
14
R3/4
″×
14
R1
″×
11
R1.1/4
″×
11
R1.1/2
″×
11
R2
″×
11
R2.1/2”X11
R3”X11
R3.1/2”X11
大径
9.728
13.157
16.662
20.955
26.441
33.249
41.910
47.803
59.614
75.184
87.884
100.330
中径
9.147
12.301
15.806
19.793
25.279
31.770
40.431
46.324
58.135
73.705
86.405
98.851
小径
8.566
11.445
14.950
18.631
24.117
30.291
38.952
44.845
56.656
72.226
84.926
97.372
基本
4.0
6.0
6.4
8.2
9.5
10.4
12.7
12.7
15.9
17.5
20.6
22.2
基准长度
最大
4.9
7.3
7.7
10.0
11.3
12.7
15.0
15.0
18.2
21.0
24.1
25.7
最小
3.1
4.7
5.1
6.4
7.7
8.1
10.4
10.4
13.6
14.0
17.1
18.7
基本
6.5
9.7
10.1
13.2
14.5
16.8
19.1
19.1
23.4
26.7
29.8
31.4
有效螺纹长度
最大
7.4
11.0
11.4
15.0
16.3
19.1
21.4
21.4
25.7
30.2
33.3
34.9
最小
5.6
8.4
8.8
11.4
12.7
14.5
16.8
16.8
21.1
23.2
26.3
27.9
圆锥内螺纹基面轴向
位移偏差（
±mm）
1.1
1.7
1.7
2.3
2.3
2.9
2.9
2.9
2.9
3.5
3.5
3.5
美制管螺纹基本尺寸及公差（牙形角60º） UN(F)
外螺纹
公差等级
螺纹代号
大径
最大最小最大
2A
中径
最小
JIC螺纹
7/16
″×
20UNF
1/2
″×
20UNF
9/16
″×
18UNF
3/4
″×
16UNF
7/8
″×
14UNF
1-1/16
″×
12UN
1-5/16
″×
12UN
1-5/8
″×
12UN
1-7/8
″×
12UN
2-1/2
″×
12UN
9/16
″×
18UNF
11/16
″×
16UN
13/16
″×
16UN
1
″×
14UNF
1-3/16
″×
12UN
1-7/16
″×
12UN
1-11/16
″×
12UN
2
″×
12UN
5/8
″×
18UNF
1-1/16
″×
14UN
9/16
″×
16UN
7/8
″×
12UN
2-1/4
″×
12UN
11.079
12.667
14.252
19.012
22.184
26.944
33.294
41.229
47.579
63.452
14.252
17.427
20.599
25.357
30.119
36.467
42.817
50.754
15.839
26.947
14.252
22.182
57.104
10.874
12.461
14.031
18.773
21.923
26.655
33.005
40.94
47.29
63.162
14.031
17.188
20.361
25.095
29.83
36.177
42.527
50.465
15.618
26.683
14.013
21.892
56.815
10.254
11.841
13.335
17.981
21.006
25.57
31.92
39.885
46.205
62.078
13.335
16.396
19.568
24.178
28.745
35.093
41.443
49.38
14.923
25.743
13.221
20.808
55.73
10.147
11.732
13.221
17.854
20.869
25.425
31.773
39.705
46.053
61.92
13.221
16.274
19.444
24.036
28.598
34.943
41.29
49.225
14.803
25.608
13.101
20.668
55.575
9.568
11.156
12.573
17.12
20.025
24.425
30.775
38.71
45.06
60.932
12.573
15.535
18.707
23.195
27.6
33.947
40.297
48.235
14.161
24.74
12.36
19.662
54.585
9.728
11.328
12.751
17.323
20.269
24.689
31.039
38.989
45.339
61.214
12.751
15.748
18.923
23.444
27.864
34.214
40.564
48.514
14.351
24.968
12.573
19.939
54.864
10.033
11.608
13.081
17.678
20.676
25.146
31.496
39.446
45.796
61.671
13.081
16.104
19.279
23.825
28.321
34.671
41.021
48.971
14.681
25.375
12.929
20.396
55.321
小径
最小
小径
最大
内螺纹
公差等级
2B
中径
最小最大
大径
10.287
11.875
13.371
18.019
21.046
25.613
31.963
39.901
46.251
62.126
13.371
16.431
19.606
24.221
28.788
35.138
41.488
49.426
14.958
25.783
13.256
20.851
55.776
10.424
12.017
13.52
18.184
21.224
25.801
32.154
40.094
46.449
62.332
13.52
16.589
19.766
24.407
28.979
35.331
41.686
49.627
15.11
25.961
13.411
21.034
55.976
11.113
12.7
14.288
19.05
22.225
26.988
33.338
41.275
47.625
63.5
14.288
17.463
20.638
25.4
30.163
36.513
42.863
50.8
15.875
26.987
14.288
22.225
57.15
ORFS螺纹
SAE螺纹
其它美制螺纹
注：UNC粗牙螺纹系列，UNF细牙螺纹系列， UNEF超细牙螺纹系列， UN不变螺距系列
布锥管螺纹基本尺寸及公差(牙形角60º) NPT
螺纹代号
Z1/8
″×
27
Z1/4
″×
18
Z3/8
″×
18
Z1/2
″×
14
Z3/4
″×
14
Z1
″×
11.5
Z1.1/4
″×
11.5
Z1.1/2
″×
11.5
Z2
″×
11.5
基面上的直径
大径
10.272
13.572
17.055
21.223
26.568
33.228
41.985
48.054
60.092
中径
9.519
12.443
15.926
19.772
25.117
31.461
40.218
46.287
58.325
小径
8.766
11.314
14.797
18.321
23.666
29.694
38.451
44.520
56.558
有效长度
7
9.5
10.5
13.5
14
17.5
18
18.5
19
螺纹长度
管端至基面长
4.572
5.080
6.096
8.028
8.611
10.160
10.688
10.688
11.074
公制螺纹基本尺寸及公差(牙形角60º) M
2024年3月12日发(作者：郜曼安)
英制管螺纹基本尺寸及公差（牙形角55º） BSPP
基本直径
螺纹代号
内螺纹
A级
大径中径小径中径公差
+0.170
+0.125
+0.125
0
+0.142
0
+0.142
0
+0.142
0
+0.180
0
+0.180
0
+0.180
0
+0.180
0
+0.217
0
+0.217
0
+0.217
0
小径公差
+0.282
0
+0.445
+0.445
0
+0.541
0
+0.541
0
+0.541
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
+0.640
0
中径公差
0
-0.107
-0.125
0
-0.125
0
-0.142
0
-0.142
0
-0.142
0
-0.180
0
-0.180
0
-0.180
0
-0.180
0
-0.217
0
-0.217
0
-0.217
大径公差
0
-0.214
-0.250
0
-0.250
0
-0.284
0
-0.284
0
-0.284
0
-0.360
0
-0.360
0
-0.360
0
-0.360
0
-0.434
0
-0.434
0
-0.434
中径公差
0
-0.214
-0.250
0
-0.250
0
-0.284
0
-0.284
0
-0.284
0
-0.360
0
-0.360
0
-0.360
0
-0.360
0
-0.434
0
-0.434
0
-0.434
外螺纹
B级
大径公差
0
-0.214
0-0.250
0
-0.250
0
-0.284
0
-0.284
0
-0.284
0
-0.360
0
-0.360
0
-0.360
0
-0.360
0
-0.434
0
-0.434
0
-0.434
G1/8
″×
28
G1/4
″×
19
G3/8
″×
19
G1/2
″×
14
G5/8
″×
14
G3/4
″×
14
G1
″×
11
G1.1/4
″×
11
G1.1/2
″×
11
G2
″×
11
G2.1/2”X11
G3”X11
G3.1/2”X11
9.728
13.157
16.662
20.955
22.911
26.441
33.249
41.910
47.803
59.614
75.184
87.884
100.330
9.147
12.301
15.806
19.793
21.749
25.279
31.770
40.431
46.324
58.135
73.705
86.405
98.851
8.566
11.445
14.950
18.631
20.587
24.117
30.291
38.952
44.854
56.656
72.226
84.926
97.372
英制锥管螺纹基本尺寸及公差（牙形角55º） BSPT
基面上的直径
螺纹代号
R1/8
″×
28
R1/4
″×
19
R3/8
″×
19
R1/2
″×
14
R3/4
″×
14
R1
″×
11
R1.1/4
″×
11
R1.1/2
″×
11
R2
″×
11
R2.1/2”X11
R3”X11
R3.1/2”X11
大径
9.728
13.157
16.662
20.955
26.441
33.249
41.910
47.803
59.614
75.184
87.884
100.330
中径
9.147
12.301
15.806
19.793
25.279
31.770
40.431
46.324
58.135
73.705
86.405
98.851
小径
8.566
11.445
14.950
18.631
24.117
30.291
38.952
44.845
56.656
72.226
84.926
97.372
基本
4.0
6.0
6.4
8.2
9.5
10.4
12.7
12.7
15.9
17.5
20.6
22.2
基准长度
最大
4.9
7.3
7.7
10.0
11.3
12.7
15.0
15.0
18.2
21.0
24.1
25.7
最小
3.1
4.7
5.1
6.4
7.7
8.1
10.4
10.4
13.6
14.0
17.1
18.7
基本
6.5
9.7
10.1
13.2
14.5
16.8
19.1
19.1
23.4
26.7
29.8
31.4
有效螺纹长度
最大
7.4
11.0
11.4
15.0
16.3
19.1
21.4
21.4
25.7
30.2
33.3
34.9
最小
5.6
8.4
8.8
11.4
12.7
14.5
16.8
16.8
21.1
23.2
26.3
27.9
圆锥内螺纹基面轴向
位移偏差（
±mm）
1.1
1.7
1.7
2.3
2.3
2.9
2.9
2.9
2.9
3.5
3.5
3.5
美制管螺纹基本尺寸及公差（牙形角60º） UN(F)
外螺纹
公差等级
螺纹代号
大径
最大最小最大
2A
中径
最小
JIC螺纹
7/16
″×
20UNF
1/2
″×
20UNF
9/16
″×
18UNF
3/4
″×
16UNF
7/8
″×
14UNF
1-1/16
″×
12UN
1-5/16
″×
12UN
1-5/8
″×
12UN
1-7/8
″×
12UN
2-1/2
″×
12UN
9/16
″×
18UNF
11/16
″×
16UN
13/16
″×
16UN
1
″×
14UNF
1-3/16
″×
12UN
1-7/16
″×
12UN
1-11/16
″×
12UN
2
″×
12UN
5/8
″×
18UNF
1-1/16
″×
14UN
9/16
″×
16UN
7/8
″×
12UN
2-1/4
″×
12UN
11.079
12.667
14.252
19.012
22.184
26.944
33.294
41.229
47.579
63.452
14.252
17.427
20.599
25.357
30.119
36.467
42.817
50.754
15.839
26.947
14.252
22.182
57.104
10.874
12.461
14.031
18.773
21.923
26.655
33.005
40.94
47.29
63.162
14.031
17.188
20.361
25.095
29.83
36.177
42.527
50.465
15.618
26.683
14.013
21.892
56.815
10.254
11.841
13.335
17.981
21.006
25.57
31.92
39.885
46.205
62.078
13.335
16.396
19.568
24.178
28.745
35.093
41.443
49.38
14.923
25.743
13.221
20.808
55.73
10.147
11.732
13.221
17.854
20.869
25.425
31.773
39.705
46.053
61.92
13.221
16.274
19.444
24.036
28.598
34.943
41.29
49.225
14.803
25.608
13.101
20.668
55.575
9.568
11.156
12.573
17.12
20.025
24.425
30.775
38.71
45.06
60.932
12.573
15.535
18.707
23.195
27.6
33.947
40.297
48.235
14.161
24.74
12.36
19.662
54.585
9.728
11.328
12.751
17.323
20.269
24.689
31.039
38.989
45.339
61.214
12.751
15.748
18.923
23.444
27.864
34.214
40.564
48.514
14.351
24.968
12.573
19.939
54.864
10.033
11.608
13.081
17.678
20.676
25.146
31.496
39.446
45.796
61.671
13.081
16.104
19.279
23.825
28.321
34.671
41.021
48.971
14.681
25.375
12.929
20.396
55.321
小径
最小
小径
最大
内螺纹
公差等级
2B
中径
最小最大
大径
10.287
11.875
13.371
18.019
21.046
25.613
31.963
39.901
46.251
62.126
13.371
16.431
19.606
24.221
28.788
35.138
41.488
49.426
14.958
25.783
13.256
20.851
55.776
10.424
12.017
13.52
18.184
21.224
25.801
32.154
40.094
46.449
62.332
13.52
16.589
19.766
24.407
28.979
35.331
41.686
49.627
15.11
25.961
13.411
21.034
55.976
11.113
12.7
14.288
19.05
22.225
26.988
33.338
41.275
47.625
63.5
14.288
17.463
20.638
25.4
30.163
36.513
42.863
50.8
15.875
26.987
14.288
22.225
57.15
ORFS螺纹
SAE螺纹
其它美制螺纹
注：UNC粗牙螺纹系列，UNF细牙螺纹系列， UNEF超细牙螺纹系列， UN不变螺距系列
布锥管螺纹基本尺寸及公差(牙形角60º) NPT
螺纹代号
Z1/8
″×
27
Z1/4
″×
18
Z3/8
″×
18
Z1/2
″×
14
Z3/4
″×
14
Z1
″×
11.5
Z1.1/4
″×
11.5
Z1.1/2
″×
11.5
Z2
″×
11.5
基面上的直径
大径
10.272
13.572
17.055
21.223
26.568
33.228
41.985
48.054
60.092
中径
9.519
12.443
15.926
19.772
25.117
31.461
40.218
46.287
58.325
小径
8.766
11.314
14.797
18.321
23.666
29.694
38.451
44.520
56.558
有效长度
7
9.5
10.5
13.5
14
17.5
18
18.5
19
螺纹长度
管端至基面长
4.572
5.080
6.096
8.028
8.611
10.160
10.688
10.688
11.074
公制螺纹基本尺寸及公差(牙形角60º) M