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| Steam, water | gas and pipes | Pipe couplings for food and fire fightingindustries | Motion tra | nsmission | Aircraft and aerospace | Oil an | d gas |
| BSPT Taper Pipe Thread | NPTF American | DIN 405 Round | ISO Trapezoidal 30° | American ACME | UNJ | API Buttress Casing | API Round Casing & Tubing |
| r=0.137278P 27.5° 27.5° 90° 1.78° r=0.137278P | 30° 30° 90° 1.78° | r=0.221047P 30° r=0.238507P r=0.255967P | 30° 0.366P | 29° 0.3707P | 60° 0.125P r=0.18042P | 1.78° 3° 10° 90° | 30° 30° 90° 1.78° |
| BSPT R(PT) Rc(PS) Rp | NPTF | Rd | Tr (TM) | ACME (Tw) | UNJ | BCSG | CSG LCSG |
| thread/inch | thread/inch | thread/inch | mm | thread/inch | thread/inch | thread/inch | thread/inch |
| 19 14 11 | 14 11.5 8 | 10 8 6 4 | 1.5 2.0 3.0 4.0 5.0 | 12 10 8 6 5 | – | 5 | 10 8 |
| – | – | – | – | – | – | – | – |
| – – | – – | – – | – – | – – | – – | – – | – – |
| 1.75 5.0 | 16 7 | 16 6 | ||
| 2.0 | 14 6 | 14 5 | ||
| 13 5 | 12 | |||
| 0.5 –1.5(48–16) | 48–16 | 0.5 –1.5 | 48–16 | |
| 1.75–3.0(14– 8) | 14– 8 | 1.75–3.0 | 14– 8 | |
| 3.5 –5.0(07– 5) | 7– 5 | 3.5 –5.0 | 7– 5 | |
| 1.5–2.0(16–13) | 1.5–2.0 | 16–13 | ||
| 1.5–2.5(16–11) | 1.5–2.5 | 16–11 | ||
| 0.5 –1.0 (36–24) | 0.5 -1.0 | 36–24 | ||
| 0.75–1.25(28–20) | 0.75-1.25 | 28–20 | ||
| 0.75–1.75(24–16) | 0.75-1.75 | 24–16 |
* When machining an internal UNJ thread, cut an internal hole with the appropriate diameter. Then machine with 60° American UN. In this case, a full form type insert cannot be used.