Page 616 - DixonCatalog20092010

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Technical
Nominal Dimensions of Standard Threads
ODM -- Outside Diameter of the Male IDF -- Inside Diameter of the Female TPI -- Threads Per Inch
Size PipeOD
Tapered
Threads Straight Threads
NPT BSPTr NPSH NPSM NST (NH) BSPP
TPI TPI TPI ODM
(max)
IDF
(min) TPI ODM
(max)
IDF
(min) TPI ODM(max)
IDF
(min) TPI ODM(max)
IDF
(min)
1/8"
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
4-1/2"
5"
6"
8"
10"
12"
.405
.540
.675
.840
1.050
1.315
1.660
1.900
2.375
2.875
3.500
4.500
5.563
6.625
8.625
10.750
12.750
27
18
18
14
14
11.5
11.5
11.5
11.5
8
8
8
8
8
8
8
8
28
19
19
14
14
11
11
11
11
11
11
11
11
11
14
14
11.5
11.5
11.5
11.5
8
0.8248
1.0353
1.2951
1.6399
1.8788
2.3528
2.8434
0.7395
0.9500
1.1921
1.5369
1.7758
2.2498
2.6930
27
18
18
14
14
11.5
11.5
11.5
11.5
8
8
8
8
8
0.397
0.526
0.662
0.823
1.034
1.293
1.638
1.877
2.351
2.841
3.467
4.466
5.528
6.585
0.358
0.468
0.603
0.747
0.958
1.201
1.546
1.785
2.259
2.708
3.334
4.333
5.395
6.452
8
9
7.5
6
4
4
4
4
1.375
1.990
3.068
3.623
5.010
5.760
6.260
7.025
1.2246
1.8577
2.9104
3.5306
4.7111
5.4611
5.9602
6.7252
11
11
11
11
11
11
11
0.383
0.516
0.656
0.825
1.041
1.309
1.650
1.882
2.347
2.960
3.460
4.450
5.450
6.450
0.337
0.450
0.588
0.733
0.950
1.193
1.534
1.766
2.231
2.844
3.344
4.334
5.359
6.359
GHT (3/4") -- 1.0625 ODM, 11-1/2 TPI
Note: Female NPT (Tapered Pipe) thread is not available on hose swivel nuts.
Normal Engagement Length of NPT Thread in Inches (A) *
* Dimensions given do not allow for variations in tapping or threading.
Thread Size Dimension A
1/8"
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
5"
6"
8"
10"
12"
1/4"
3/8"
3/8"
1/2"
9/16"
11/16"
11/16"
11/16"
3/4"
15/16"
1"
1-1/8"
1-1/4"
1-5/16"
1-7/16"
1-5/8"
1-3/4"