In mechanical engineering, the thread angle of a screw is the included angle between the thread flanks, measured in a plane containing the thread axis. This is a defining factor for the shape of a screw thread. Standard values include:
| Name | Code | Angle | Profile | Standards |
|---|---|---|---|---|
| Most V-threads (including ISO, NPT and UTS) | M | 60° | DIN 13 / ISO ? / ASME/ANSI ? | |
| Whitworth threads | W | 55° | DIN 49301 / BS ? | |
| British standard pipe thread | G | 55° | DIN / BS / EN / ISO 228-1 / ISO 7-1 | |
| National Pipe Thread | NPT | 60° | ASME B1.20.-1983 Pipe Threads, General Purpose, Inch | |
| Rd | 30° | DIN 405 / DIN 20400 | |
| Acme thread | 29° | ASME/ANSI B1.5-1988 | ||
| Metric trapezoidal threads | Tr | 30° | DIN 103 | |
| Buttress threads | S | 45° | DIN 2781 | |
| German buttress threads | S | 30° | DIN 513 | |
| Square threads | Sq | 0° (parallel) | ? | |
| Panzergewinde, "steel conduit thread" | Pg | 80° | DIN 40430 | |
| British Association (BA) thread | BA | 47° 30' = 47.5° | BS 93:2008 | |
| Löwenherz thread | 53° 8' ≈ 53.1° | |||
| Bodmer thread | 50° |
Notes
Bibliography
- Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2.
- Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (1996), Green, Robert E.; McCauley, Christopher J. (eds.), Machinery's Handbook (25th ed.), New York: Industrial Press, ISBN 978-0-8311-2575-2, OCLC 473691581.
References
Bhandari 2007, p. 203. - Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2 https://books.google.com/books?id=f5Eit2FZe_cC ↩
Knuckle Thread DIN 405 http://www.gewinde-normen.de/en/knuckle-thread-din-405.html ↩
Knuckle Thread DIN 20400 http://www.gewinde-normen.de/en/knuckle-thread-din-20400.html ↩
Bornemann http://www.bornemann-gewindetechnik.de/en/products/threading-technology/knuckle-threads.html ↩
Knuckle thread http://www.bornemann-gewindetechnik.de/dateien/pdf/en/Rundgewinde_2_ZG.PDF ↩
Bhandari 2007, p. 204. - Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2 https://books.google.com/books?id=f5Eit2FZe_cC ↩
Machinery's Handbook (1996), pp. 1716. - Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (1996), Green, Robert E.; McCauley, Christopher J. (eds.), Machinery's Handbook (25th ed.), New York: Industrial Press, ISBN 978-0-8311-2575-2, OCLC 473691581. https://search.worldcat.org/oclc/473691581 ↩
Bhandari 2007, p. 203. - Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2 https://books.google.com/books?id=f5Eit2FZe_cC ↩
Bhandari 2007, p. 204. - Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2 https://books.google.com/books?id=f5Eit2FZe_cC ↩
Bhandari 2007, p. 204. - Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2 https://books.google.com/books?id=f5Eit2FZe_cC ↩
Bhandari 2007, p. 203. - Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2 https://books.google.com/books?id=f5Eit2FZe_cC ↩
Löwenherz thread http://www.gewinde-normen.de/en/loewenherz-thread.html ↩
Bodmer thread http://www.gewinde-normen.de/en/bodmer-thread.html ↩