42J1834-408 0.38 N·m NEMA17 Stepper Motor - 34 mm

For engineers designing compact precision instruments, the 42J1834-408 offers a 0.38 N·m NEMA17 Stepper Motor in a body only 34 mm long. Rated at 0.8 A per phase with a 5 mm shaft, it delivers 0.38 N·m of holding torque, enough for microscope stages, optical filter changers, and light inspection fixtures where length and weight are at a premium.

Short Body, Predictable Motion

The 34 mm stack is what makes this motor interesting. In medical instruments and laboratory automation, the reduced length lowers the cavity required and lets the motor fit where a standard 40 mm unit would collide with optics, tubing, or enclosure walls. Sample handlers use its repeatable stepping to position probes and slides, while 3D printers with tight gantry spacing benefit from the reduced overhang.

Inspection equipment advances conveyor belts or rotary inspection tables one index at a time, and small pump systems drive low-flow dosing heads with consistent steps. The low 0.8 A current keeps driver requirements modest and helps maintain stable temperatures inside sensitive instruments.

Engineering Data

• Frame: NEMA17 (42 mm)
• Body length: 34 mm
• Phase current: 0.8 A
• Holding torque: 0.38 N·m
• Shaft: 5 mm
• Type: 2-phase, open-loop

Applications in Medical, Lab and Optical Equipment

Microscope stages, filter wheels, and inspection fixtures are the core targets. The motor produces controlled, low-vibration stepping that keeps measurement paths stable, and the open-loop design removes the cost and wiring of an encoder for simple index-and-hold duties.

Selection and Operating Notes

Size the axis on the torque required at the working speed, since the short stack trades some peak torque for compactness: at 0.38 N·m this is a light-load instrument motor, not a heavy-axis actuator. Drive it at the rated 0.8 A and choose a microstep resolution matched to the positioning repeatability you need. A precise air gap lowers vibration, keeping sensitive instrument stages stable during measurement, and the standard NEMA17 pattern and 5 mm shaft simplify bracketing and coupling selection in compact systems.