2208:
560:
series of sizes. Because of the pipe wall thickness of
Schedule pipe, the actual diameter of the NPT threads is larger than the Nominal Pipe Size diameter, and considerably so for small sizes. Pipe of a given size in a different Schedule than Schedule 40 provides a different wall thickness while
374:
Because the thread body is tapered (0.75 in/ft or 62.5 mm/m), a larger diameter keeps compressing into a smaller diameter and finally forms a seal (no clearance remains between the crests and roots of the threads because of the taper). This means that NPT fittings should be
561:
maintaining the same outside diameter and thread profile as
Schedule 40. Thus the inside diameter of a given size of Schedule pipe differs from the Nominal Pipe Size, while outside diameters for a given nominal Schedule size are the same between Schedules.
358:
in which the threads merely hold the pieces together and do not provide a seal. The various types of pipe threads are designed for use both with or without thread sealants, as particular applications demand. The sealants, where used, are typically
573:. On the other hand, for sealing capability, tapered (pressure-tight) threads have crest and root shapes that differ from Sellers. For example, the NPT has a crest width of 0.038 to 0.062 pitch, which is sharper than the 0.125 pitch of Sellers.
20:
596:
tape (often referred to by the popular brand name "Teflon") or another sealant compound. NPTF threads have the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path.
535:
inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread. The half-angle (between the taper surface and the axis of the pipe) is
2407:
354:
The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to parallel/straight thread fittings or
2421:
383:
like lubricating paste or thread seal tape. The use of tape also helps to limit corrosion on the threads, which otherwise can make future disassembly nearly impossible.
556:(often abbreviated NPS, which should not be confused with the abbreviation NPS for the straight thread form standard) is loosely related to the inside diameter of
104:
2494:
519:
2529:
2465:
158:
For rigidity; sealable with o-ring or gasket; sometimes male straight is mated with female tapered for low-pressure sealing (need to verify)
2268:
32:
28:
2450:
Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (1996), Green, Robert E.; McCauley, Christopher J. (eds.),
2425:
506: inch are occasionally used for compressed air, while sizes larger than 6 inches are often joined by other methods.
2328:
2235:
24:
652:
59:
2514:
644:
2366:
2390:
2452:
593:
332:
2253:
100:
2489:
355:
2263:
2231:
625:
336:
231:
American
National Standard Straight Pipe Thread for Loose-fitting Mechanical Joints with Locknuts
47:
368:
2524:
2471:
2461:
2324:
553:
301:
2457:
2258:
360:
592:, defined by ASME B1.20.3) is designed to provide a more leak-free seal without the use of
70:-tight sealing, or both. The types are named with a full name and an abbreviation, such as
2519:
2227:
536:
493:
2234:, presented a standard for nuts, bolts, and screws. Out of this effort came the first
331:
fluid. These threads are now used in materials other than steel and brass, including
2508:
2283:
2273:
204:
55:
2278:
2221:
618:
611:
570:
115:
The various types are each named with an abbreviation and a full name, as follows:
63:
51:
248:
American
National Standard Straight Pipe Thread for Free-fitting Mechanical Joints
144:
Tapered and needs thread sealant; for connections in nearly every type of service
99:
Outside North
America, some US pipe thread sizes are widely used, as well as many
525:
The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (
557:
376:
2346:
2344:
2342:
2340:
2302:
2300:
2475:
2248:
2207:
380:
364:
348:
328:
19:
2499:
606:
American
Society of Mechanical Engineers National Pipe Thread Taper (NPT)
217:
Dryseal USA (American) Standard
Intermediate Internal Straight Pipe Thread
284:
173:
67:
16:
U.S. national technical standards for threads on pipes and pipe fittings
316:
235:
2370:
344:
66:
and straight thread series for various purposes, including rigidity,
315:
Threaded pipes can provide an effective seal for pipes transporting
265:
For dryseal connections in nearly every type of service, especially
2206:
340:
324:
320:
200:
American
National Standard Straight Pipe Thread for Hose Couplings
186:
Dryseal USA (American) Standard Fuel
Internal Straight Pipe Thread
18:
569:
National Pipe Thread series have the same 60° included angle as
515:
266:
280:
American
National Standard Taper Pipe Thread for Railing Joints
220:
Similar to NPSF but slightly larger; internal only, straight
169:
American National Standard Straight Pipe Thread for Couplings
2422:"BSP and NPT threads - Detailed Explanation, Differences"
2350:
2306:
496:
and fittings by most US suppliers. Sizes smaller than
2495:
ASME B1.20.-1983 Pipe Threads, General Purpose, Inch
117:
590:
Dryseal American National Standard Taper Pipe Thread
2211:Hand-tight and effective thread engagement lengths
2402:
2400:
2398:
262:Dryseal USA (American) Standard Taper Pipe Thread
46:standards for short, are United States national
155:American National Standard Straight Pipe Thread
2222:Screw thread § History of standardization
8:
141:American National Standard Taper Pipe Thread
92:is an abbreviation for male iron pipe, and
2361:
2359:
96:is an abbreviation for female iron pipe.
604:
2296:
304:; similar to NPTF but one turn shorter
363:thread sealant or a thread seal paste
40:American National Standard Pipe Thread
651:
643:
624:
367:(sometimes similar in composition to
7:
107:7–1, 7–2, 228–1, and 228-2 threads.
297:Dryseal SAE Short Taper Pipe Thread
214:National pipe straight–intermediate
183:National pipe straight–fuel and oil
2269:Gender of connectors and fasteners
251:For various rigid mechanical uses
14:
2367:"ANSI Thread Series Designations"
245:National pipe straight–mechanical
259:National pipe taper–fuel and oil
577:National pipe taper fuel (NPTF)
166:National pipe straight–coupling
31:NPT thread, while the elbow is
2530:Standards of the United States
2323:. Newtown, CT: Taunton Press.
2236:United States Standard threads
228:National pipe straight–locknut
1:
379:-free and lubricated using a
492:, 4, 5, and 6 inch, as
294:Pipe taper, fuel, SAE, short
2456:(25th ed.), New York:
2351:Machinery's Handbook (1996)
2307:Machinery's Handbook (1996)
549:) ≈ 1.7899° ≈ 1° 47′.
277:National pipe taper–railing
197:National pipe straight–hose
2546:
2490:NPT Pipe Thread Dimensions
2238:, including pipe threads.
2219:
635:
632:
629:
617:
610:
129:
126:
123:
120:
582:National Pipe Taper Fuel
386:Commonly used sizes are
189:Internal only, straight
42:standards, often called
2319:Cauldwell, Rex (2006).
2500:NPT Taper Pipe Threads
2408:"National Pipe Thread"
2212:
630:Hand-tight engagement
152:National pipe straight
36:
2353:, pp. 1776–1778.
2309:, pp. 1772–1781.
2254:British Standard Pipe
2210:
101:British Standard Pipe
22:
2453:Machinery's Handbook
2230:, then president of
356:compression fittings
124:Shorthand expansion
62:. They include both
44:national pipe thread
2391:Engineering toolbox
607:
138:National pipe taper
48:technical standards
2264:Garden hose thread
2232:Franklin Institute
2213:
605:
522:standard B1.20.1.
514:NPT is defined by
37:
23:Threaded pipe and
2467:978-0-8311-2575-2
2205:
2204:
633:Effective thread
554:Nominal Pipe Size
552:The standard for
308:
307:
302:SAE International
27:. The pipe has a
2537:
2515:Thread standards
2479:
2458:Industrial Press
2437:
2436:
2434:
2433:
2424:. Archived from
2418:
2412:
2411:
2404:
2393:
2388:
2382:
2381:
2379:
2378:
2369:. Archived from
2363:
2354:
2348:
2335:
2334:
2316:
2310:
2304:
2259:Fire hose thread
1838:
1837:
1833:
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361:thread seal tape
118:
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2228:William Sellers
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369:plumber's putty
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2497:
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2484:External links
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626:Thread pitch P
623:
616:
602:
601:Standard sizes
599:
588:, also called
578:
575:
571:Sellers thread
566:
563:
511:
510:Specifications
508:
312:
309:
306:
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205:hose couplings
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56:threaded pipes
15:
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9:
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4:
3:
2:
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2448:
2447:
2443:
2428:on 2016-04-26
2427:
2423:
2417:
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2409:
2403:
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2399:
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2387:
2384:
2373:on 2008-05-14
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1869:
1866:
1863:
1860:
1857:
1854:
1851:
1848:
1845:
1844:
1840:
1825:
1822:
1819:
1816:
1813:
1810:
1807:
1804:
1801:
1798:
1795:
1792:
1789:
1786:
1785:
1781:
1766:
1763:
1760:
1757:
1754:
1751:
1748:
1745:
1742:
1739:
1736:
1733:
1730:
1727:
1726:
1722:
1707:
1704:
1701:
1699:
1697:
1695:
1693:
1691:
1689:
1687:
1684:
1681:
1678:
1663:
1662:
1658:
1643:
1640:
1637:
1634:
1631:
1628:
1625:
1622:
1619:
1616:
1613:
1610:
1607:
1604:
1603:
1599:
1584:
1581:
1578:
1575:
1572:
1569:
1566:
1563:
1560:
1557:
1554:
1551:
1548:
1533:
1532:
1528:
1513:
1510:
1507:
1504:
1501:
1498:
1495:
1492:
1489:
1486:
1483:
1480:
1477:
1474:
1473:
1469:
1454:
1451:
1448:
1445:
1442:
1439:
1436:
1433:
1430:
1427:
1424:
1421:
1418:
1403:
1402:
1398:
1383:
1380:
1377:
1374:
1371:
1368:
1365:
1362:
1359:
1356:
1353:
1350:
1335:
1332:
1331:
1327:
1312:
1309:
1306:
1303:
1300:
1297:
1294:
1291:
1288:
1285:
1282:
1279:
1264:
1249:
1248:
1244:
1229:
1226:
1223:
1220:
1217:
1214:
1211:
1208:
1205:
1202:
1199:
1196:
1181:
1166:
1165:
1161:
1146:
1143:
1140:
1137:
1134:
1131:
1128:
1125:
1122:
1119:
1116:
1113:
1098:
1095:
1094:
1090:
1079:
1076:
1073:
1070:
1067:
1064:
1061:
1058:
1055:
1052:
1049:
1046:
1043:
1032:
1031:
1027:
1016:
1013:
1010:
1007:
1004:
1001:
998:
995:
992:
989:
986:
983:
980:
969:
968:
964:
953:
950:
947:
944:
941:
938:
935:
932:
929:
926:
923:
920:
917:
906:
905:
901:
890:
887:
884:
881:
878:
875:
872:
869:
866:
863:
860:
857:
854:
843:
842:
838:
835:
832:
829:
826:
823:
820:
817:
814:
811:
808:
805:
802:
799:
788:
787:
784:
782:
779:
776:
773:
770:
767:
764:
761:
758:
755:
752:
749:
746:
735:
734:
730:
727:
724:
721:
718:
715:
713:
710:
707:
705:
702:
699:
696:
693:
690:
689:
682:
679:
673:
667:
664:
658:
657:
654:
646:
627:
622:
613:
609:
600:
598:
595:
591:
587:
583:
576:
574:
572:
564:
562:
559:
555:
550:
538:
523:
521:
517:
509:
507:
495:
384:
382:
378:
372:
370:
366:
362:
357:
352:
350:
346:
342:
338:
334:
330:
326:
322:
318:
310:
303:
299:
296:
293:
291:PTF-SAE SHORT
290:
289:
286:
282:
279:
276:
273:
272:
268:
264:
261:
258:
255:
254:
250:
247:
244:
241:
240:
237:
234:For use with
233:
230:
227:
224:
223:
219:
216:
213:
210:
209:
206:
202:
199:
196:
193:
192:
188:
185:
182:
179:
178:
175:
171:
168:
165:
162:
161:
157:
154:
151:
148:
147:
143:
140:
137:
134:
133:
121:Abbreviation
119:
116:
110:
108:
106:
102:
97:
95:
91:
87:
85:
81:
77:
73:
69:
65:
61:
60:pipe fittings
57:
53:
52:screw threads
49:
45:
41:
34:
30:
26:
21:
2451:
2444:Bibliography
2430:. Retrieved
2426:the original
2416:
2386:
2375:. Retrieved
2371:the original
2320:
2314:
2279:Thread angle
2225:
589:
585:
581:
580:
568:
551:
524:
513:
385:
373:
353:
314:
300:Named after
269:connections
172:For general
114:
103:threads and
98:
93:
89:
88:
83:
79:
75:
71:
43:
39:
38:
2167:0.12500000
2122:0.12500000
2077:0.12500000
2032:0.12500000
1987:0.12500000
1942:0.12500000
1897:0.12500000
1852:0.12500000
1793:0.12500000
1734:0.12500000
1682:0.12500000
1611:0.12500000
1552:0.12500000
1481:0.12500000
1422:0.12500000
1351:0.08695652
1280:0.08695652
1197:0.08695652
1114:0.08695652
1047:0.07142857
984:0.07142857
921:0.05555555
858:0.05555555
803:0.03703704
750:0.03703704
649:diameter D
565:Thread form
558:Schedule 40
2509:Categories
2432:2016-04-17
2377:2008-04-27
2330:1561588172
2291:References
2220:See also:
683:Diameter E
668:Diameter E
615:pipe size
127:Full name
2476:473691581
2249:AN thread
2226:In 1864,
2197:609.6000
2188:23.91563
2179:23.86094
2152:508.0000
2143:19.91563
2134:19.87031
2107:457.2000
2098:17.91563
2089:17.87500
2062:406.4000
2053:15.91563
2044:15.87575
2017:355.6000
2008:13.91563
1999:13.87263
1972:323.8500
1963:12.66563
1954:12.61781
1927:273.0500
1918:10.66563
1909:10.62094
1882:219.0750
1841:161.1313
1823:168.2750
1782:134.1438
1764:141.3002
1723:120.6500
1705:127.0000
1659:107.9500
1641:114.3000
1582:101.6000
653:Tap drill
381:lubricant
365:pipe dope
349:cast iron
329:hydraulic
174:couplings
2525:Plumbing
2321:Plumbing
2242:See also
1873:8.54063
1864:8.50003
1814:6.54063
1805:6.50597
1755:5.47863
1746:5.44929
1632:4.41563
1623:4.38713
1600:95.2500
1573:3.91563
1564:3.88881
1529:82.5500
1511:88.9000
1502:3.41563
1493:3.38850
1470:66.6750
1452:73.0250
1443:2.79063
1434:2.76216
1399:56.3563
1381:60.3250
1372:2.31630
1363:2.29627
1328:44.0531
1310:48.2600
1301:1.84131
1292:1.82234
1245:38.1000
1227:42.1640
1218:1.60131
1209:1.58338
1162:29.3688
1144:33.4010
1135:1.25631
1126:1.23863
1091:23.4156
1077:26.6700
1068:1.00178
1059:0.98887
1028:18.2563
1014:21.3360
1005:0.79178
996:0.77843
942:0.63750
933:0.62701
879:0.50250
870:0.49163
824:0.38000
815:0.37360
762:0.28118
674:Length L
659:Length L
647:outside
638:length L
636:Overall
285:railings
236:locknuts
130:Comment
68:pressure
54:used on
2216:History
2194:24.000
2191:3.6837
2170:3.1750
2149:20.000
2146:3.2837
2125:3.1750
2104:18.000
2101:3.0837
2080:3.1750
2059:16.000
2056:2.8837
2035:3.1750
2014:14.000
2011:2.6837
1990:3.1750
1969:12.750
1966:2.5587
1945:3.1750
1924:10.750
1921:2.3587
1900:3.1750
1876:2.1462
1855:3.1750
1834:⁄
1817:1.9462
1796:3.1750
1775:⁄
1758:1.8400
1737:3.1750
1716:⁄
1685:3.1750
1672:⁄
1652:⁄
1635:1.7337
1614:3.1750
1593:⁄
1576:1.6837
1555:3.1750
1542:⁄
1522:⁄
1505:1.6337
1484:3.1750
1463:⁄
1446:1.5712
1425:3.1750
1412:⁄
1392:⁄
1375:1.0582
1354:2.2087
1344:⁄
1321:⁄
1304:1.0252
1283:2.2087
1273:⁄
1258:⁄
1238:⁄
1221:1.0085
1200:2.2087
1190:⁄
1175:⁄
1155:⁄
1138:0.9845
1117:2.2087
1107:⁄
1084:⁄
1071:0.7935
1050:1.8143
1037:⁄
1021:⁄
1008:0.7815
987:1.8143
974:⁄
965:14.684
958:⁄
951:17.145
945:0.6006
924:1.4111
911:⁄
902:11.113
895:⁄
888:13.716
882:0.5946
861:1.4111
848:⁄
839:8.6106
833:10.287
827:0.3924
806:0.9407
793:⁄
774:0.3896
771:0.2875
753:0.9407
740:⁄
621:density
619:Thread
612:Nominal
544:⁄
530:⁄
501:⁄
487:⁄
473:⁄
459:⁄
445:⁄
431:⁄
421:⁄
411:⁄
401:⁄
391:⁄
317:liquids
64:tapered
2520:Piping
2474:
2464:
2327:
2182:3.2500
2173:2.3750
2137:2.8500
2128:2.1250
2092:2.6500
2083:2.0000
2047:2.4500
2038:1.8120
2002:2.2500
1993:1.5620
1957:2.1250
1948:1.3600
1912:1.9250
1903:1.2100
1879:8.625
1867:1.7125
1858:1.0630
1820:6.625
1808:1.5125
1799:0.9580
1761:5.563
1749:1.4063
1740:0.9370
1702:5.000
1638:4.500
1626:1.3000
1617:0.8440
1579:4.000
1567:1.2500
1558:0.8210
1508:3.500
1496:1.2000
1487:0.7660
1449:2.875
1437:1.1375
1428:0.6820
1378:2.375
1366:0.7565
1357:0.4360
1307:1.900
1295:0.7235
1286:0.4200
1224:1.660
1212:0.7068
1203:0.4200
1141:1.315
1129:0.6828
1120:0.4000
1074:1.050
1062:0.5457
1053:0.3390
1011:0.840
999:0.5337
990:0.3200
948:0.675
936:0.4078
927:0.2400
885:0.540
873:0.4018
864:0.2278
836:0.339
830:0.405
818:0.2639
809:0.1615
780:7.950
777:0.313
765:0.2611
756:0.1600
680:Turns
665:Turns
645:Actual
537:arctan
347:, and
345:bronze
327:, and
33:female
2185:26.00
2176:19.00
2140:22.80
2131:17.00
2095:21.20
2086:16.00
2050:19.60
2041:14.50
2005:18.00
1996:12.50
1960:17.00
1951:10.88
1915:15.40
1870:13.70
1811:12.10
1752:11.25
1629:10.40
1570:10.00
719:inch
716:inch
711:inch
708:inch
703:inch
694:inch
691:inch
478:, 3,
464:, 2,
436:, 1,
341:nylon
325:steam
321:gases
111:Types
82:, or
25:elbow
2472:OCLC
2462:ISBN
2325:ISBN
1906:9.68
1861:8.50
1802:7.66
1743:7.50
1620:6.75
1561:6.57
1499:9.60
1490:6.13
1440:9.10
1431:5.46
1369:8.70
1360:5.01
1298:8.32
1289:4.83
1215:8.13
1206:4.83
1132:7.85
1123:4.60
1065:7.64
1056:4.75
1002:7.47
993:4.48
939:7.34
930:4.32
876:7.23
867:4.10
821:7.13
812:4.36
768:7.05
759:4.32
728:inch
722:inch
697:inch
594:PTFE
586:NPTF
520:ASME
516:ANSI
494:pipe
377:burr
333:PTFE
311:Uses
283:For
274:NPTR
267:fuel
256:NPTF
242:NPSM
225:NPSL
211:NPSI
203:For
194:NPSH
180:NPSF
163:NPSC
84:NPSC
80:NPTF
58:and
50:for
29:male
2161:24
2116:20
2071:18
2026:16
1981:14
1936:12
1891:10
1044:14
981:14
918:18
855:18
800:27
747:27
731:mm
725:mm
700:mm
371:).
337:PVC
149:NPS
135:NPT
105:ISO
94:FIP
90:MIP
76:NPS
72:NPT
2511::
2470:,
2460:,
2397:^
2358:^
2339:^
2299:^
2164:8
2119:8
2074:8
2029:8
1984:8
1939:8
1894:8
1849:8
1846:8
1836:32
1832:11
1790:8
1787:6
1777:32
1731:8
1728:5
1679:8
1608:8
1605:4
1549:8
1478:8
1475:3
1419:8
1394:32
1337:11
1333:2
1323:64
1319:47
1266:11
1183:11
1157:32
1100:11
1096:1
1086:64
1082:59
1023:32
1019:23
960:64
956:37
897:16
742:16
546:32
450:,
426:,
416:,
406:,
396:,
351:.
343:,
339:,
335:,
323:,
319:,
86:.
78:,
74:,
2478:.
2435:.
2410:.
2380:.
2333:.
1829:+
1827:6
1773:9
1770:+
1768:5
1718:4
1714:3
1711:+
1709:4
1674:2
1670:1
1667:+
1665:4
1654:4
1650:1
1647:+
1645:4
1595:4
1591:3
1588:+
1586:3
1544:2
1540:1
1537:+
1535:3
1524:4
1520:1
1517:+
1515:3
1465:8
1461:5
1458:+
1456:2
1414:2
1410:1
1407:+
1405:2
1390:7
1387:+
1385:2
1346:2
1342:1
1339:+
1316:+
1314:1
1275:2
1271:1
1268:+
1260:2
1256:1
1253:+
1251:1
1240:2
1236:1
1233:+
1231:1
1192:2
1188:1
1185:+
1177:4
1173:1
1170:+
1168:1
1153:5
1150:+
1148:1
1109:2
1105:1
1102:+
1039:4
1035:3
976:2
972:1
913:8
909:3
893:7
850:4
846:1
795:8
791:1
738:1
685:2
676:2
670:1
661:1
640:4
584:(
542:1
539:(
532:4
528:3
518:/
503:8
499:1
489:2
485:1
482:+
480:3
475:2
471:1
468:+
466:2
461:2
457:1
454:+
452:1
447:4
443:1
440:+
438:1
433:4
429:3
423:2
419:1
413:8
409:3
403:4
399:1
393:8
389:1
35:.
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