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Thread angle

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Diagram of a thread angle

The thread angle of a screw is the angle between the threads.[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 ?
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 ?
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° ? ?

References

Notes

  1. ^ a b c Bhandari 2007, p. 203.
  2. ^ Knuckle Thread DIN 405
  3. ^ Knuckle Thread DIN 20400
  4. ^ Bornemann
  5. ^ Knuckle thread
  6. ^ a b c Bhandari 2007, p. 204.
  7. ^ Green 1996, p. 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: Industrial Press, ISBN 978-0-8311-2575-2, OCLC 473691581.