Home > Nema 8 Stepper Motor
| Item | Specifications |
|---|---|
| Step Angle Accuracy | ±5% |
| Resistance Accuracy | ±10% |
| Inductance Accuracy | ±20% |
| Temperature Rise | 80°C Max. |
| Ambient Temperature | -20°C ~ +50°C |
| Insulation Resistance | 100MΩ Min. 500VDC |
| Dielectric Strength | 500V AC 1 minute |
| Allowable Radial Load | 0.02mm Max. (450g load) |
| Allowable Thrust Load | 0.08mm Max. (450g load) |
| Model | Step Angle (°) | Length (mm) | Current (A/phase) | Resistance (Ω/phase) | Inductance (mH/phase) | Holding Torque (N·m) | Rotor Inertia (g·cm²) | Leads | Weight (kg) |
| 20BYG250-30 | 1.8 | 30 | 0.6 | 6.5 | 1.7 | 0.018 | 2 | 4 | 0.05 |
| 20BYG250-33 | 1.8 | 33 | 0.6 | 6.5 | 1.7 | 0.02 | 2 | 4 | 0.06 |
| 20BYG250-42 | 1.8 | 42 | 0.8 | 5.4 | 1.5 | 0.03 | 3.6 | 4 | 0.08 |
*These are representative models. We can manufacture products according to customer's requirements.
A NEMA 8 stepper motor is a 2-phase hybrid stepper with a 20 × 20 mm mounting face — the smallest standard NEMA frame. It has a 1.8° step angle and 4-wire bipolar wiring, and holds 0.018 to 0.06 N·m depending on body length. It is made for small, precise, space-constrained axes.
Holding torque runs from 0.018 N·m on the shortest 28 mm body up to 0.06 N·m on the 38 mm body. This is small by design — the NEMA 8 is the smallest frame and is meant for light loads, not heavy axes. If you need more torque, the NEMA 11 or NEMA 17 is the next step up.
The step angle is 1.8°, which is 200 full steps per revolution. With a microstepping driver, each full step is divided further — for example, 16 microsteps per step gives 3200 steps per revolution — for smoother motion and finer positioning.
The standard NEMA 8 is 4-wire bipolar, which works with any standard bipolar stepper driver. We can change the lead-wire length and connector to suit your wiring.
The NEMA 8 suits light loads — optics mounts, small pumps, lab and medical devices, miniature printers, camera focus and zoom. For heavier loads, choose a larger frame; the 20 mm body is sized for precision in tight spaces, not for high torque.
Yes. We customize the shaft (diameter, length, flat, pinion, or lead screw), body length, lead wires, connector, and winding to your specification. Custom labeling is available for OEM projects.
It runs on any standard 2-phase bipolar stepper driver, and we can supply a matched driver sized to the motor as a ready-to-run set. A microstepping driver is available when you need finer resolution.
The NEMA 8 stepper motor is the smallest standard frame in the NEMA range, with a 20 × 20 mm faceplate. It is a 2-phase hybrid stepper with a 1.8° step angle (200 steps per revolution) and 4-wire bipolar wiring. Holding torque runs from 0.018 to 0.06 N·m across body lengths of 28 to 38 mm — small by design, because the NEMA 8 is built for light, space-constrained axes, not for moving heavy loads. Where a larger frame won't fit and the load is small, this is the motor that drops in.
| Parameter | Specification |
|---|---|
| Frame Size | 20 × 20 mm |
| Step Angle | 1.8° (200 steps/rev) |
| Phase | 2-phase bipolar |
| Holding Torque | 0.018 – 0.06 N·m |
| Rated Current | 0.2 – 0.6 A/phase |
| Body Length | 28 – 38 mm |
| Lead Wires | 4-wire |
| Weight | 50 – 80 g |
The NEMA 8 is about fitting precise motion into a small space:
The NEMA 8 suits small, light, precise axes:
For more torque in a slightly larger frame, step up to the NEMA 11 stepper motor. See the full stepper motor range for all frame sizes.
Cymotorix NEMA 8 stepper motors can be customized for OEM integration. As a NEMA 8 stepper motor manufacturer and supplier, we produce them to your specification. Common modifications include:
The NEMA 8 runs on any standard 2-phase bipolar stepper driver. We can supply a matched driver sized to the motor current, so the set is ready to run on arrival. For finer resolution, a microstepping driver divides each 1.8° full step into smaller increments.
