Thread angle

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.[1] This is a defining factor for the shape of a screw thread. Standard values include:

Name Code Angle Profile Standards
Most V-threads M 60° including DIN 13 / ISO, NPT and UTS
Whitworth threads W 55°[2] 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° [6] DIN 405 / DIN 20400
Acme thread[7] 29° ASME/ANSI B1.5-1988[8]
Metric trapezoidal threads[1] Tr 30° DIN 103
Buttress threads[7] S 45° DIN 2781
German buttress threads[7] 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[9] 53° 8' ≈ 53.1°
Bodmer thread[10] 50°
Thury thread[11][12] 47° 30' = 47.5°

References

Notes

  1. ^ a b c Bhandari 2007, p. 203.
  2. ^ BS 84: 1956
  3. ^ Knuckle Thread DIN 405
  4. ^ Knuckle Thread DIN 20400
  5. ^ Bornemann
  6. ^ Knuckle thread
  7. ^ a b c Bhandari 2007, p. 204.
  8. ^ Machinery's Handbook (1996), pp. 1716.
  9. ^ Löwenherz thread
  10. ^ Bodmer thread
  11. ^ 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.
  12. ^ Thury 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.

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