42J1825-404 Compact NEMA17 Stepper Motor - 25 mm, 0.35 N.m

The 42J1825-404 is the shortest NEMA17 (42 mm) motor in this range at 25 mm, delivering 0.35 N·m at 0.4 A with a 5 mm shaft. It fits instrument cavities measured in centimeters while retaining usable torque.

Maximum Compactness on NEMA17

The 0.35 N·m rating is significant for so short a stack, and the 0.4 A current keeps power demand minimal. The motor integrates where a longer NEMA17 would collide with lenses, tubing or enclosure walls.

Engineering Data

• Frame: NEMA17 (42 mm)
• Body length: 25 mm
• Phase current: 0.4 A
• Holding torque: 0.35 N·m
• Shaft: 5 mm
• Type: 2-phase, open-loop

Application scenarios

Small medical adjusters, laboratory positioning fixtures and optical mechanisms benefit from a motor that delivers controlled movement in a minimal footprint without generating excessive heat or noise. In 3D printers it suits compact extruder designs and small auxiliaries such as filament sensors and bed-leveling mechanisms. Inspection equipment uses the short stack for height gauges and fine Z adjustments, while pump systems drive small dosing heads where envelope space is at a premium.

Selection advice

At 0.4 A the motor allows simple driver circuitry and small power supplies, easing integration into portable or battery-powered instruments. Because the stack is short, verify the torque at your working speed rather than at standstill, and keep acceleration modest to avoid losing steps on light-inertia loads that move quickly. The standard NEMA17 interface with a 5 mm shaft allows high-density axis layouts, but confirm the coupling bore matches the shaft before assembly.