147 / 172
Technical
145
Dixon Fire 2016
877.712.6179 •
dixonvalve.comO
Technical
Thread Dimensions
Normal Engagement Length of NPT Thread
Nominal Dimensions of Standard Threads
ODM -- Outside Diameter of the Male
IDF -- Inside Diameter of the Female
TPI -- Threads Per Inch
Size Pipe
OD
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
8
9
7.5
6
4
4
4
4
1.375
1.375
1.990
3.068
3.623
5.010
5.760
6.260
7.025
1.2246
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.
•
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"