Types of Threads
Thread Form
There are many different types of thread forms (shape) available. The most common are;
- Unified
- Metric
Thread Form Choice
Thread form choice depends on;
- what it will be used for
- length of engagement
- load
- etc…
| Thread Form | Figure | Uses |
|---|---|---|
| Unified |  |
General use. |
| Metric | |
General use. |
| Square |  |
Ideal thread for power transmission. |
| ACME |  |
Stronger than the square thread. |
| Buttress |  |
Designed to handle heavy forces in one direction (e.g. truck jack). |