NEMA 8 (20mm) Fixed Through Shaft Type Hybrid Stepper Motor

The NEMA 8 (20mm) fixed through shaft type hybrid stepper motor features a captive linear actuator design with a built-in anti-rotation mechanism (spline) integrated into the motor body. Unlike non-captive designs where the screw passes entirely through, the fixed type allows the lead screw to extend and retract linearly without rotating — functioning like a built-in linear push rod. This design is ideal for short-stroke applications (typically < 30mm) where space is extremely limited and no external anti-rotation guide is available. The integrated spline prevents screw rotation, allowing direct load connection without additional mechanical components. This miniature linear actuator is the preferred choice for medical devices, optical focusing systems, micro-robotics, and precision positioning equipment where compactness and reliability are paramount.

Structure Type: Fixed Through Shaft (Captive) — Screw extends/retracts linearly, does not rotate. Built-in spline prevents rotation. Best for short-stroke, space-constrained applications.