National Pipe Straight NPS NPSM Thread Plug Gauge
|
Nominal Pipe Size
|
Threads per Inch
|
External Thread
|
Internal Thread
|
|
Allowance
|
Major Diameter
|
Pitch Diameter
|
Minor Diameter
|
Pitch Diameter
|
|
Max. aa
|
Min.
|
Max.
|
Min.
|
Min. aa
|
Max.
|
Min.
|
Max.
|
|
Free-fitting Mechanical Joints for Fixtures—NPSM
|
|
1/8
|
27
|
0.0011
|
0.397
|
0.390
|
0.3725
|
0.3689
|
0.358
|
0.364
|
0.3736
|
0.3783
|
|
1/4
|
18
|
0.0013
|
0.526
|
0.517
|
0.4903
|
0.4859
|
0.468
|
0.481
|
0.4916
|
0.4974
|
|
3/8
|
18
|
0.0014
|
0.662
|
0.653
|
0.6256
|
0.6211
|
0.603
|
0.612
|
0.6270
|
0.6329
|
|
1/2
|
14
|
0.0015
|
0.823
|
0.813
|
0.7769
|
0.7718
|
0.747
|
0.759
|
0.7784
|
0.7851
|
|
3/4
|
14
|
0.0016
|
1.034
|
1.024
|
0.9873
|
0.9820
|
0.958
|
0.970
|
0.9889
|
0.9958
|
|
1
|
11 1/2
|
0.0017
|
1.293
|
1.281
|
1.2369
|
1.2311
|
1.201
|
1.211
|
1.2386
|
1.2462
|
|
1 1/4
|
11 1/2
|
0.0018
|
1.638
|
1.626
|
1.5816
|
1.5756
|
1.546
|
1.555
|
1.5834
|
1.5912
|
|
1 1/2
|
11 1/2
|
0.0018
|
1.877
|
1.865
|
1.8205
|
1.8144
|
1.785
|
1.794
|
1.8223
|
1.8302
|
|
2
|
11 1/2
|
0.0019
|
2.351
|
2.339
|
2.2944
|
2.2882
|
2.259
|
2.268
|
2.2963
|
2.3044
|
|
2 1/2
|
8
|
0.0022
|
2.841
|
2.826
|
2.7600
|
2.7526
|
2.708
|
2.727
|
2.7622
|
2.7720
|
|
3
|
8
|
0.0023
|
3.467
|
3.452
|
3.3862
|
3.3786
|
3.334
|
3.353
|
3.3885
|
3.3984
|
|
3 1/2
|
8
|
0.0023
|
3.968
|
3.953
|
3.8865
|
3.8788
|
3.835
|
3.848
|
3.8888
|
3.8988
|
|
4
|
8
|
0.0023
|
4.466
|
4.451
|
4.3848
|
4.3771
|
4.333
|
4.346
|
4.3871
|
4.3971
|
|
5
|
8
|
0.0024
|
5.528
|
5.513
|
5.4469
|
5.4390
|
5.395
|
5.408
|
5.4493
|
5.4598
|
|
6
|
8
|
0.0024
|
6.585
|
6.570
|
6.5036
|
6.4955
|
6.452
|
6.464
|
6.5060
|
6.5165
|
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