Product Description:

The M21NRXD-LNN-NS-00 is a hybrid stepper motor produced by Pacific Scientific as part of the POWERMAX II M Motors series. Designed for positioning tasks in automated assembly stations, pick-and-place modules, and light CNC axes, the motor converts digital step commands into precise rotary movement while maintaining position without a brake. Because it follows the NEMA mounting pattern used throughout the series, it can be bolted directly to gearheads or linear stages that rely on compact, high-torque steppers for open-loop motion control.

With a NEMA 23 frame, the motor occupies a 2.3-inch square face for straightforward retrofit. Its electromagnetic circuit yields 135 oz-in of holding torque, enough to support vertical loads when the drive is energized. The parallel windings draw 1.51 A, a level that guides power-supply sizing and limits copper heat. Each full step advances the shaft by 1.8 degrees; one revolution therefore generates 200 positions, and the ±1.5% step accuracy produces 0.009 in of linear resolution on a 1-inch lead screw. A single-stack rotor with winding type D is attached to a smooth 0.2500-inch shaft for slide-on couplings. Lead wires exit the housing for quick hookup, and the NEMA face includes four tapped holes.

Overall package depth is only 2.06 in, allowing dense multi-axis panels. The windings are rated at Class B 130 °C, which permits continuous service while the ambient temperature remains between -20 °C and +40 °C. Rotor inertia is 0.0017 oz-in-s², which supports rapid acceleration with minimal drive power. Heat leaves the case through a 5.5 °C/Watt thermal resistance path, so forced-air cooling is seldom required. The insulation system withstands 340 Vdc and shows 100 MΩ resistance for reliable dielectric separation. A receptacle groups the lead wires, and the smooth shaft configuration reduces seal wear in single-ended applications.