OKI space motor, ML4410

Inside countless dot-matrix and small-office printers, the OKI Space Motor ML4410 (part number 40627101) keeps paper advancing and print heads moving with dependable precision. This 2-phase stepper motor is a direct fit for many OKI printer mechanisms and other small automation tasks where a NEMA 17 frame and 1.8° step angle are required. It runs on 12 V DC, draws 0.6 A per phase, and delivers 0.3 Nm of holding torque—enough to handle rollers, carriages, and similar loads without stalling.

Key specifications

• Motor type: 2-phase stepper motor
• Step angle: 1.8° (200 steps per revolution)
• Rated voltage: 12 V DC
• Rated current per phase: 0.6 A
• Holding torque: 0.3 Nm (42.5 oz-in)
• Number of leads: 4
• Winding resistance per phase: 20 Ohms
• Winding inductance per phase: 4 mH
• Shaft diameter: 5 mm
• Shaft length: 20 mm
• Mounting hole pattern: NEMA 17 compatible (31 mm x 31 mm)
• Insulation class: Class B (130°C)
• Operating temperature range: -10°C to +50°C
• Connector type: 4-pin JST-style connector
• Rotor inertia: 35 g·cm²
• Detent torque: 0.015 Nm
• Rotation direction: Bi-directional (CW/CCW)
• Typical application: Printer mechanisms, small automation

Why choose it

This motor matches the original OKI specification, so you can replace a worn or failed unit without reworking brackets or wiring. The NEMA 17 footprint and standard 5 mm shaft make it compatible with common pulleys and couplers. Its Class B insulation and wide temperature range ensure reliable operation in typical office and light industrial environments. The 4-pin JST-style connector simplifies installation, and the bi-directional rotation gives you full control in firmware.

Ideal use cases

• Replacement stepper motor for OKI dot-matrix and small-office printers
• Paper feed and carriage drive mechanisms
• Small CNC machines, 3D printers, and robotics where a NEMA 17 motor is specified
• Automated test fixtures and small linear actuators

Good to know

The ML4410 is a bare stepper motor; you will need a suitable stepper driver (e.g., A4988, DRV8825, or similar) to control it. Always set the driver current to 0.6 A or less to avoid overheating. The motor is bi-directional, so direction is determined by the pulse sequence from your controller. If you are replacing a motor in an OKI printer, verify the connector pinout against the original before powering on.