57J1841-420 Short NEMA23 Stepper Motor - 0.75 N·m

A Short NEMA23 Stepper Motor with 0.75 N·m of Useful Torque

The 57J1841-420 is a NEMA23 Stepper Motor, the shortest 57 mm-frame motor in this range at 43 mm, delivering 0.75 N·m at 2.0 A with a 6.35 mm shaft. It targets light-duty mechanisms where a compact body is the primary constraint.

Compact NEMA23 with Useful Torque

At 0.75 N·m the motor drives light conveyors, small rotary indexes and label-feed rollers. The low 2.0 A current simplifies the electrical path and keeps the driver and supply small, ideal for space-constrained motion control.

Specification

• Frame: NEMA23 (57 mm)
• Body length: 43 mm
• Phase current: 2.0 A
• Holding torque: 0.75 N·m
• Shaft: 6.35 mm
• Type: 2-phase, open-loop

Light-Duty Robotics and Mechanisms

The short body and low inertia make the motor suitable for small robotic fingers, light linkages and positioning mechanisms that cycle quickly with small loads. Packaging and food-processing accessories use it where a standard NEMA23 mount must fit in a shallow cavity, and laboratory or instrument builders value the quiet, low-vibration running.

Thermal Management

The modest current inherently limits heating, supporting reliable operation in enclosed, thermally sensitive designs. This makes the motor a good match for compact machines where the electronics and actuator share a sealed compartment.

Where a 43 mm NEMA23 Makes Sense

When a full-size NEMA23 body cannot fit, this motor still provides the standard 57 mm bolt pattern. That means existing brackets and pulleys can be retained while the motor cavity shrinks. It is also a common choice for multi-axis mechanisms where several motors share a tight carrier plate.

Mounting

Standard NEMA23 pattern with a 6.35 mm shaft. Confirm the coupling bore and bracket spacing when specifying, since the smaller shaft is not the default NEMA23 size. Match a driver rated for at least 2.0 A and verify the torque-speed curve for the operating RPM. Lyenwsin can supply the motor, driver and couplings for compact automation projects.