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 (ISO/EN/DIN) |
|---|---|---|---|---|
| Most V-threads (including ISO and UTS) |
60° |  |
M | DIN 13 |
| Whitworth threads | 55° |  |
W | DIN 49301 |
| Pipe thread | 55° |  |
G | DIN EN ISO 228-1 |
| Knuckle thread / Round thread[citation needed] | 30° |  |
Rd | DIN 405 / DIN 20400 |
| Acme threads[2] | 29° |  |
||
| Trapezoidal threads[1] | 30° |  |
Tr | DIN 103 |
| Buttress threads[2] | 45° |  |
S | DIN 2781 |
| German Buttress threads[2] | 30° |  |
S | DIN 513 |
| Square threads[1] | 0° |  |
Sq | |
| Steel conduit threads | 80° |  |
Pg | DIN 40430 |
References
Notes
Bibliography
- Bhandari, V B (2007), Design of Machine Elements, Tata McGraw-Hill, ISBN 9780070611412.