42J1825-404 0.35 N·m NEMA17 Stepper Motor - 25 mm

When instrument space is measured in centimetres, the 42J1825-404 provides a 0.35 N·m NEMA17 Stepper Motor in the shortest 42 mm-frame package of the range at just 25 mm. Despite the slim body, it holds 0.35 N·m at only 0.4 A per phase and uses a standard 5 mm shaft, so engineers can place real torque where a longer motor would not fit.

Compact Footprint, Minimal Power Demand

The 0.35 N·m rating is significant for such a short stack, and the 0.4 A current keeps power demand minimal. That combination suits portable and battery-powered instruments, where driver circuitry and supply size are part of the mechanical budget. 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 gain controlled movement in a minimal footprint without excessive heat or noise. In 3D printers the motor 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 compact 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 permits high-density axis layouts, but confirm the coupling bore matches the shaft before assembly. The compact geometry also reduces rotor inertia, so the axis settles faster after each move, which matters for inspection routines that take many small positioning steps in sequence.