Thread angle

The thread angle of a screw is the included angle between the thread flanks, measured in a plane containing the thread axis.[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 ?
  • Pipe thread
  • British standard pipe thread
 G 55° DIN / BS / EN / ISO 228-1 / ISO 7-1
 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° ?
 Pg 80° DIN 40430
British Association (BA) thread BA
  • 47° 30'
 ? BS 93:2008
Löwenherz thread[8] ?
  • 53° 8'
  • (53.1°)
 ? ?
Bodmer thread[9] ? 50° ? ?
Diagram of a thread angle

References

Notes
  1. Bhandari 2007, p. 203.
  2. Knuckle Thread DIN 405
  3. Knuckle Thread DIN 20400
  4. Bornemann
  5. Knuckle thread
  6. Bhandari 2007, p. 204.
  7. Machinery's Handbook (1996), pp. 1716.
  8. Löwenherz thread
  9. Bodmer thread

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, NY, USA: Industrial Press, ISBN 978-0-8311-2575-2, OCLC 473691581.
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