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:
Thread standard | Thread angle | Profile | Letter code | Standards |
---|---|---|---|---|
Most V-threads (including ISO, NPT and UTS) | 60° | M | DIN 13 / ISO ? / ASME/ANSI ? | |
Whitworth threads | 55° | W | DIN 49301 / BS ? | |
Pipe thread British standard pipe thread | 55° | G | DIN / BS / EN / ISO 228-1 / ISO 7-1 | |
Knuckle thread / round thread[2][3][4] | 30° | [5] | Rd | DIN 405 / DIN 20400 |
Acme thread[6] | 29° | ? | ASME/ANSI B1.5-1988[7] | |
Metric trapezoidal threads[1] | 30° | Tr | DIN 103 | |
Buttress threads[6] | 45° | S | DIN 2781 | |
German Buttress threads[6] | 30° | S | DIN 513 | |
Square threads[1] | 0° | Sq | ? | |
Steel conduit thread aka Panzergewinde | 80° | Pg | DIN 40430 | |
Löwenherz thread[8] | 53° 8' | ? | ? | ? |
Bodmer thread [9] | 50° | ? | ? | ? |
References
Notes
- ↑ 1.0 1.1 1.2 Bhandari 2007, p. 203.
- ↑ Knuckle Thread DIN 405
- ↑ Knuckle Thread DIN 20400
- ↑ Bornemann
- ↑ Knuckle thread
- ↑ 6.0 6.1 6.2 Bhandari 2007, p. 204.
- ↑ Green 1996, p. 1716.
- ↑ Löwenherz thread
- ↑ Bodmer thread
Bibliography
- Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 978-0-07-061141-2.
- Green, Robert E. et al. (eds) (1996), Machinery's Handbook (25 ed.), New York, NY, USA: Industrial Press, ISBN 978-0-8311-2575-2.