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 ?
G 55° Rohrgewinde.jpg DIN / BS / EN / ISO 228-1 / ISO 7-1
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 ?
Pg 80° Stahlpanzerrohrgewinde.jpg DIN 40430
British Association (BA) thread BA
  • 47° 30'
? BS 93:2008
Löwenherz thread[8] ?
  • 53° 8'
  • (53.1°)
? ?
Bodmer thread[9] ? 50° ? ?

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