| Major diameter | The largest diameter of a thread. |
| Minor diameter | The smallest diameter of a thread. |
| Lead | The distance a thread advances axially in one turn. |
| Galling | Friction between relative motion of moving surface causes material to break away
away from the surface and thus causing a form of local welding. Soft materials are very susceptible for galling, but it can
usually be avoided by use of proper lubricants. |
| Pitch | The nominal distance between two adjacent thread roots or crests. |
| Pooching | |
| Shank | The part of a bolt between the head and the threaded section. |
| Thread runout | The part of the bolt that forms the transition between the threaded and unthreaded section of the shank. |