NPT American Taper Pipe Thread
ANSI B 1.20.1
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- ISO Coarse Thread (metric) DIN 13-1
- ISO Fine Thread I (metric) DIN 13-2
- ISO Fine Thread II (metric) DIN 13-3
- ISO Fine Thread III (metric) DIN 13-4
- ISO Fine Thread IV (metric) DIN 13-5
- ISO Fine Thread V (metric) DIN 13-6
- ISO Fine Thread VI (metric) DIN 13-7
- ISO Fine Thread VII (metric) DIN 13-8
- ISO Fine Thread VIII (metric) DIN 13-9
- ISO Fine Thread IX (metric) DIN 13-10
- ISO Fine Thread X (metric) DIN 13-11
- ISO Thread (metric)
DIN 14-2 - Knuckle Thread DIN 405
- Knuckle Thread
DIN 20400 - Buttress Fine Thread DIN 514
- Buttress Coarse Thread DIN 513
- Buttress Thread 45°
DIN 2781 - Trapezoidal Fine Thread DIN 103
- Trapezoidal Coarse Thread DIN 103
- Valve Thread DIN 7756
- Cycle Thread DIN 79012
- PG Thread DIN 40430
- Pipe Thread DIN 158
- Dairy Thread DIN 11851
- Edison Thread
DIN 40400 - Glass Thread DIN 40450
- Knuckle Thread for glass containers DIN 168
- Threads for plastic containers DIN 6063
- Camera mount Thread
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- Whitworth Instrument Thread
- Whitworth Fine DIN 239
- Whitworth Fine DIN 240
- Whitworth Fine
DIN LON 282 - Whitworth Fine
DIN LON special - Whitworth Fine
DIN LON 286 - Whitworth Fine
DIN LON 287 - S. J. Thread
- Sellers Thread
- UNC Thread (USA)
- UNEF Thread (USA)
- UNF Thread (USA)
- UNM Thread (USA)
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- Sharp V Thread (USA)
- ME Model Engineer Thread (GB)
- BA British Association (GB)
- BSB British Standard Brass (GB)
- BSF Whitworth Fine Thread (GB)
- BSW Whitworth Coarse Thread (GB)
- BSPP Whitworth Pipe Thread (GB)
- BSPT Tapered Whitworth Pipe Thread (GB)
- Conversion Inch-Fractions to mm
- Conversion TPI to pitch mm
- Drill bit sizes
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American Taper Pipe Thread, with sealant compound. National Pipe Taper (1:16)
The flank angle is 60°, the profile was originated by William Sellers.
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| Nominal Diameter | Major Diameter mm | Tapping Drill Size mm | TPI | Pitch mm |
| 1/16" - 27 NPT | 7.895 | 6.00 | 27 | 0.941 |
| 1/8" - 27 NPT | 10.242 | 8.25 | 27 | 0.941 |
| 1/4" - 18 NPT | 13.616 | 10.70 | 18 | 1.411 |
| 3/8" - 18 NPT | 17.055 | 14.10 | 18 | 1.411 |
| 1/2" - 14 NPT | 21.223 | 17.40 | 14 | 1.814 |
| 3/4" - 14 NPT | 26.568 | 22.60 | 14 | 1.814 |
| 1" - 11 1/2 NPT | 33.228 | 28.50 | 11.5 | 2.209 |
| 1 1/4" - 11 1/2 NPT | 41.985 | 37.00 | 11.5 | 2.209 |
| 1 1/2" - 11 1/2 NPT | 48.054 | 43.50 | 11.5 | 2.209 |
| 2" - 11 1/2 NPT | 60.092 | 55.00 | 11.5 | 2.209 |
| 2 1/2" - 8 NPT | 72.699 | 65.50 | 8 | 3.175 |
| 3" - 8 NPT | 88.608 | 81.50 | 8 | 3.175 |
| 3 1/2" - 8 NPT | 101.316 | 94.30 | 8 | 3.175 |
| 4" - 8 NPT | 113.973 | 107.00 | 8 | 3.175 |
| 5" - 8 NPT | 141.300 | 134.384 | 8 | 3.175 |
| 6" - 8 NPT | 168.275 | 161.191 | 8 | 3.175 |
| 8" - 8 NPT | 219.075 | 211.673 | 8 | 3.175 |
| 10" - 8 NPT | 273.050 | 265.311 | 8 | 3.175 |
| 12" - 8 NPT | 323.850 | 315.793 | 8 | 3.175 |
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