Thread angle

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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 (including ISO, NPT and UTS) M 60° DIN 13 / ISO ? / ASME/ANSI ?
Whitworth threads W 55° 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° [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 ?
Panzergewinde, "steel conduit thread" Pg 80° DIN 40430
British Association (BA) thread BA 47° 30' = 47.5° BS 93:2008
Löwenherz thread[8] 53° 8' ≈ 53.1°
Bodmer thread[9] 50°

References[edit]

Notes[edit]

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.