42J1848-425 High Current NEMA17 Stepper Motor - 2.5 A

The 42J1848-425 is a High Current NEMA17 Stepper Motor in the standard 42 mm frame, extending 48 mm and producing 0.48 N·m of holding torque at a 2.5 A phase current. Its 5 mm shaft and 2-phase open-loop design make it a straightforward building block for laboratory mechanisms, pump drives, and compact 3D printer axes that need dependable torque in a small footprint.

What the High-Current Winding Delivers

The higher current rating is what separates this NEMA17 from standard low-current units. At 2.5 A the motor reaches 0.48 N·m, which is noticeably more output per cubic centimetre than a low-current equivalent of similar length. For designers that means a 48 mm stack can do work that previously required a longer motor or a move up to a NEMA23 frame, while keeping the overall machine compact.

The winding accepts sustained drive current from a capable microstepping driver. Because the torque is generated continuously, the motor copes with variations in load, such as a pump that sees slightly different fluid pressure on each stroke, without stalling.

Key Specifications

• Frame: NEMA17 (42 mm)
• Body length: 48 mm
• Phase current: 2.5 A
• Holding torque: 0.48 N·m
• Shaft: 5 mm
• Type: 2-phase, open-loop

Applications in Laboratory, Pump and 3D Printing Systems

Laboratory dispensing systems and peristaltic pumps value the repeatable stepping motion for fluid or sample positioning. Without encoder feedback, the motor relies on clean step sequencing, which keeps instrument control simple and cost-effective. In 3D printers the motor drives extruder feed and Z-axis movement where compact torque matters and space is limited.

Medical mechanisms also benefit from the predictable, quiet motion. The low profile and standard NEMA17 mounting pattern let engineers slot the motor into existing axis designs with minimal bracket changes.

Thermal Behavior and Selection Notes

The 2.5 A rating means the winding generates more heat than a low-current motor. Mount the motor on a heat-sink surface where possible and confirm the driver can deliver the rated current per phase. For continuous-duty applications, verify the torque needed at your operating speed rather than at standstill; holding torque is a static value, and available torque drops as speed rises. With adequate cooling and a correctly sized driver, the 42J1848-425 provides a reliable balance of compactness and torque for light industrial and instrument use.