Thread angle

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Diagram of a 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° Spitzgewinde.jpg DIN 13 / ISO ? / ASME/ANSI ?
Whitworth threads W 55° Whitworth-Gewinde.jpg DIN 49301 / BS ?
British standard pipe thread G 55° Rohrgewinde.jpg DIN / BS / EN / ISO 228-1 / ISO 7-1
National Pipe Thread NPT 60° NPT Dimensions.svg ASME B1.20.-1983 Pipe Threads, General Purpose, Inch
Rd 30° Rundgewinde.jpg[5] DIN 405 / DIN 20400
Acme thread[6] 29° Acme thread.svg ASME/ANSI B1.5-1988[7]
Metric trapezoidal threads[1] Tr 30° Trapezgewinde 2.jpg DIN 103
Buttress threads[6] S 45° Buttress thread form.svg DIN 2781
German buttress threads[6] S 30° Saegengewindeprofil.jpg DIN 513
Square threads[1] Sq Flachgewinde.jpg ?
Panzergewinde, "steel conduit thread" Pg 80° Stahlpanzerrohrgewinde.jpg DIN 40430
British Association (BA) thread BA 47° 30' = 47.5° British Association Thread Profile.gif BS 93:2008
Löwenherz thread[8] 53° 8' ≈ 53.1°
Bodmer thread[9] 50°

References[edit]

Notes[edit]

  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. ^ Machinery's Handbook (1996), pp. 1716.
  8. ^ Löwenherz thread
  9. ^ Bodmer thread

Bibliography[edit]

  • 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.