57J1856-440 1.2 N·m NEMA23 Stepper Motor - Compact 56 mm

A Compact 1.2 N·m NEMA23 Stepper Motor for Light Duty

The 57J1856-440 is a 1.2 N·m NEMA23 Stepper Motor, a compact 2-phase motor, 56 mm long, rated 1.2 N·m at 4.0 A with a 6.35 mm shaft. It is sized for light-duty movement on the standard 57 mm mounting grid.

Light-Duty Positioning

At 1.2 N·m the motor handles registration rollers, light conveyors and low-inertia axes in motion control systems where large torque is unnecessary. The 6.35 mm shaft is a smaller-than-typical NEMA23 standard, so choose couplings accordingly.

Data

• Frame: NEMA23 (57 mm)
• Body length: 56 mm
• Phase current: 4.0 A
• Holding torque: 1.2 N·m
• Shaft: 6.35 mm
• Type: 2-phase, open-loop

Where It Earns Its Place

Desktop CNC routers and small motion-control stages use it for X/Y/Z axes where a compact frame and clean step response matter more than raw torque. Light-duty handling systems, including registration rollers, indexing turntables and small pick mechanisms, get dependable position holding at a lower cost per axis than a servo. Robotics and compact mechanisms that move light loads benefit from the low body weight and low inertia, which improve response to short step commands, and textile, printing and food-processing lines use it for consistent, low-vibration drive of light rollers and feed belts.

Selection and Operating Notes

Verify the 6.35 mm shaft bore on your coupling or pulley, since a mismatched bore creates runout and shortens bearing life. Set the driver current to 4.0 A and tune the acceleration profile to the axis inertia so the motor does not lose steps on fast ramps.

Integration

The NEMA23 pattern retains compatibility with standard brackets and pulleys. A precise air gap holds vibration low, which matters where components must not be disturbed during positioning. Lyenwsin offers the motor with compatible couplings and drive recommendations for light-duty axes. For machines that later need more torque, the same frame size allows an upgrade to a longer NEMA23 body without changing the mount.