Linear Technology
Lead Pitch
The lead pitch (also called pitch or lead) specifies how far a nut or carriage moves linearly per complete revolution (360°) of the leadscrew. It is the central design parameter determining the relationship between thrust force, travel speed, and positioning precision in linear actuators.
Definition
| Pitch | Thrust Force | Travel Speed | Self-Locking |
|---|---|---|---|
| Small (≤ 5 mm) | High | Low | Often possible |
| Medium (5–15 mm) | Medium | Medium | Thread dependent |
| Large (≥ 15 mm) | Low | High | No |
Practical Relevance
When sizing screw jack gearboxes and linear actuators, lead pitch is one of the most critical input parameters. A small pitch is suited for precision positioning with high holding forces (e.g., lifting columns, presses), while large pitches are chosen for fast traversing movements without load-holding requirements (e.g., feed systems). The combination of pitch and motor rated speed determines the maximum travel speed of the actuator.