Page 504 - RHAU-MKT RYCO Product Technical Manual 2018-12-14 v1-9
P. 504

 TECHNICAL
THREAD AND CONNECTOR IDENTIFICATION
National Pipe threads are similar in function to BSP threads, but are not generally interchangeable. NPTF threads (also known as Dryseal) are an improvement to NPT. Controlled truncation of threads mean the metal-to-metal thread seal is at root and crest of threads, in addition to flanks of threads. Use of thread sealant is recommended for NPT male and NPT.
  NPT & NPS THREADS
NPT IS NPS IS NPTF IS NPSM IS
NATIONAL PIPE TAPER (AMERICAN) NATIONAL PIPE STRAIGHT (PARALLEL) NATIONAL PIPE TAPER FOR FUEL NATIONAL PIPE STRAIGHT MECHANICAL
THREAD FORM PER ANSI/ASME B1.20.1
THREAD FORM PER ANSI/ASME B1.20.1
THREAD FORM PER SAE J476a, ANSI/ASME B1.20.3 THREAD FORM PER ANSI/ASME B1.20.1, SAE J514
                                                                                                                                                                             Measure NPT male thread OD and NPT female thread ID at first full thread near end of fitting.
 NPT THREAD DIMENSIONS
        NPT THREAD SIZE & PITCH
DASH SIZE
MALE THREAD MINOR OD
FEMALE THREAD ID
       inch - TPI
mm
inch
mm
inch
       1/8 - 27
-02
9,9
0.39
8,4
0.33
       1/4 -18
-04
13,2
0.52
11,2
0.44
       3/8 -18
-06
16,6
0.65
14,7
0.58
       1/2 -14
-08
20,6
0.81
17,8
0.70
       3/4 -14
-12
26,0
1.02
23,4
0.92
       1 - 11.1/2
-16
32,5
1.28
29,5
1.16
       1.1/4 - 11.1/2
-20
41,2
1.62
38,1
1.50
       1.1/2 - 11.1/2
-24
47,3
1.86
43,9
1.73
       2 - 11.1/2
-32
59,3
2.33
56,4
2.22
       2.1/2 - 8
-40
71,5
2.82
69,1
2.72
       3- 8
-48
87,3
3.44
84,8
3.34
       NPSM THREAD DIMENSIONS
      NPSM THREAD SIZE
DASH SIZE
FEMALE THREAD ID
     inch - TPI
mm
inch
     1/8 - 27
-02
8,6
0.34
     1/4 - 18
3/8 - 18
-04
11,9
0.47
     -06
15,0
0.59
     1/2 - 14
-08
19,1
0.75
     3/4 - 14
-12
24,6
0.97
     1 - 11.1/2
-16
30,5
1.20
     1.1/4 - 11.1/2
-20
39,4
1.55
     1.1/2 - 11.1/2
-24
45,5
1.79
     2 - 11.1/2
-32
57,4
2.26
     2.1/2 - 8
-40
68,8
2.71
     3- 8
-48
84,6
3.33
              NOTE: Thread size refers to the nominal bore of the pipe.
Subtract approximately 1/4”(6 mm) from thread measurement for nominal pipe size. Pitch is Threads Per Inch (TPI).
502 RYCO QUALITY
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