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° |  |
Rd | DIN 405 / DIN 20400 |
| Acme threads[5] | 29° |  |
Acme | ASME/ANSI B1.5-1988[6] |
| Trapezoidal threads[1] | 30° |  |
Tr | DIN 103 |
| Buttress threads[5] | 45° |  |
S | DIN 2781 |
| German Buttress threads[5] | 30° |  |
S | DIN 513 |
| Square threads[1] | 0° |  |
Sq | ? |
| Steel conduit thread aka Panzergewinde |
80° |  |
Pg | DIN 40430 |
References
Notes
- ^ a b c Bhandari 2007, p. 203.
- ^ Knuckle Thread DIN 405
- ^ Knuckle Thread DIN 20400
- ^ Bornemann
- ^ a b c Bhandari 2007, p. 204.
- ^ Green 1996, p. 1716.
Bibliography
- Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 9780070611412.
- 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.