Thread angle

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title: "Thread angle" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["screws", "metalworking-terminology", "threading-(manufacturing)"] description: "Angle between flanks of a screw thread" topic_path: "general/screws" source: "https://en.wikipedia.org/wiki/Thread_angle" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Angle between flanks of a screw thread ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/a/a0/thread_angle.svg" caption="Diagram of a thread angle"] ::

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:

::data[format=table]

Name	Code	Angle	Profile	Standards
Most V-threads	M	60°	[[File:Spitzgewinde.jpg	120px]]
Whitworth threads	W	55°	[[File:Whitworth-Gewinde.jpg	120px]]
British standard pipe thread	G	55°	[[File:Rohrgewinde.jpg	120px]]
National Pipe Thread	NPT	60°	[[File:NPT_Dimensions.svg	120px]]
{{plainlist		Rd	30°	[[File:Rundgewinde.jpg
Acme thread		29°	[[File:Acme thread.svg	120px]]
Metric trapezoidal threads	Tr	30°	[[File:Trapezgewinde 2.jpg	120px]]
Buttress threads	S	45°	[[File:Buttress thread form.svg	120px]]
German buttress threads	S	30°	[[File:Saegengewindeprofil.jpg	120px]]
Square threads	Sq	0° (parallel)	[[File:Flachgewinde.jpg	120px]]
Panzergewinde, "steel conduit thread"	Pg	80°	[[File:Stahlpanzerrohrgewinde.jpg	120px]]
British Association (BA) thread	BA	47°30'= °	[[File:British Association Thread Profile.gif	90px]]
Löwenherz thread		53°8'≈ °
Bodmer thread		50°
Thury thread		47°30'= °
::

References

• List of DIN standards

Notes

Bibliography

• .

References

1. {{Harvnb. Bhandari. 2007
2. [https://journeymans-workshop.uk/whitworth.php BS 84: 1956]
3. [http://www.gewinde-normen.de/en/knuckle-thread-din-405.html Knuckle Thread DIN 405]
4. [http://www.gewinde-normen.de/en/knuckle-thread-din-20400.html Knuckle Thread DIN 20400]
5. [http://www.bornemann-gewindetechnik.de/en/products/threading-technology/knuckle-threads.html Bornemann]
6. [http://www.bornemann-gewindetechnik.de/dateien/pdf/en/Rundgewinde_2_ZG.PDF Knuckle thread]
7. {{Harvnb. Bhandari. 2007
8. [http://www.gewinde-normen.de/en/loewenherz-thread.html Löwenherz thread]
9. [http://www.gewinde-normen.de/en/bodmer-thread.html Bodmer thread]
10. Brooks, Randall C. "Standard Screw Threads for Scientific Instruments. Part 1: Production Techniques and the Filière Suisse." ''History and Technology,'' vol 5, 1988, pp. 68.
11. [https://www.gewinde-normen.de/en/thury-thread.html Thury thread]

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