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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.cite-ref-bhandari2007p203-1-0[1] 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 |

| Knuckle thread [ 2 ] [ 3 ] [ 4 ] Round thread | Rd | 30° | [ 5 ] | DIN 405 / DIN 20400 |

| Acme thread [ 6 ] | | 29° | | ASME/ANSI B1.5-1988 [ 7 ] |

| Metric trapezoidal threads [ 1 ] | Tr | 30° | | DIN 103 |

| Buttress threads [ 6 ] | S | 45° | | DIN 2781 |

| German buttress threads [ 6 ] | S | 30° | | DIN 513 |

| Square threads [ 1 ] | 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 [ 8 ] | | 53° 8' ≈ 53.1° | | |

| Bodmer thread [ 9 ] | | 50° | | |

• References

• Notes

• Bibliography

cite-note-bhandari2007p203-11. ↑ Bhandari 2007, p. 203.

cite-note-21. Knuckle Thread DIN 405

cite-note-32. Knuckle Thread DIN 20400

cite-note-43. Bornemann

cite-note-54. Knuckle thread

cite-note-bhandari2007p204-65. Bhandari 2007, p. 204.

cite-note-footnotemachinery-s-handbook19961716-76. Machinery's Handbook (1996), pp. 1716.

cite-note-87. Löwenherz thread

cite-note-98. Bodmer thread

• citerefbhandari2007Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2.

• citerefmachinery-s-handbook1996Oberg, 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.