LDO 42STH48-1684AC Stepper

High‑torque. Precision‑engineered. Proven LDO reliability.

The LDO 42STH48‑1684AC is a premium NEMA 17 hybrid stepper motor designed for applications that demand smooth motion, consistent torque, and long‑term durability. Trusted across 3D printers, CNC systems, robotics, and automation equipment, this motor delivers the performance and build quality LDO Motors is known for.

Key Features

• 1.8° step angle for accurate positioning and smooth motion control
• 1.68A rated current—ideal for modern high‑performance motion systems
• High holding torque: 2.8 kg·cm for reliable force under load
• Low inductance (1.65 mH) enabling fast response and crisp microstepping performance
• 48 mm body length—a versatile mid‑size NEMA 17 format suitable for extruders, axes, and compact machinery
• Detachable cable support for easy integration into custom builds

Technical Specifications

• Step Angle: 1.8°
• Rated Voltage: 2.8V
• Rated Current: 1.68A
• Resistance/Phase: 1.65Ω
• Inductance/Phase: 1.65mH
• Holding Torque: 2.8 kg·cm
• Rotor Inertia: 22 g·cm²
• Body Length: 48mm
• Weight: 0.35 kg

Ideal Applications

The 42STH48‑1684AC is a versatile motor suited for:

• 3D printer extruders and motion axes
• CNC linear stages
• Robotics and automation
• Precision positioning systems
• Compact mechatronic assemblies

Its balance of torque, responsiveness, and thermal performance makes it a favourite among makers, engineers, and OEMs.

Why Choose LDO Motors?

LDO has become one of the most trusted names in the 3D printing and motion‑control community thanks to:

• Consistent manufacturing quality
• Tight tolerance control
• Excellent reliability and lifespan
• Strong community and OEM adoption

If you’re building or upgrading a motion system, the 42STH48‑1684AC offers a dependable, high‑performance foundation.