Bj42d15 26v10 Stepper Motor Datasheet Verified May 2026

The following parameters represent the standard operating ratings for the BJ42D15-26V10 series: Step Angle: 1.8° (200 steps per revolution) Rated Voltage: 2.6V DC Rated Current: 1.0A per phase Phase Resistance: 2.6 Ω ± 10% Phase Inductance: 5.0 mH ± 20% Holding Torque: 0.35 N·m (approx. 49 oz-in) Detent Torque: 15 mN·m Max Rotor Inertia: 54 g·cm² Weight: 0.28 kg (approx. 0.62 lbs) Insulation Class: B (130°C) Mechanical Dimensions

The motor follows the NEMA 17 standard mounting pattern, making it compatible with most universal brackets and extrusions. Frame Size: 42mm x 42mm Body Length: 34mm (excluding shaft) Shaft Diameter: 5.0mm (usually D-cut for pulley stability) Shaft Length: 20mm - 24mm (typical) Mounting Holes: 4 x M3 threaded holes Wiring and Phase Configuration

The BJ42D15-26V10 is a 4-wire bipolar stepper motor. Accurate wiring is critical to prevent driver damage and ensure the correct direction of rotation. Pin / Wire Color Description Black Phase A Start Green Phase A End Red Phase B Start Blue Phase B End Performance Characteristics Torque-to-Speed Curve

At its rated 1.0A current, the BJ42D15-26V10 maintains a flat torque curve at lower RPMs. As stepping frequency increases, the inductive reactance causes a gradual drop in torque. Using a higher-voltage chopper driver (e.g., 12V or 24V) is recommended to overcome back-EMF and maintain performance at high speeds. Heat Dissipation bj42d15 26v10 stepper motor datasheet verified

While rated for Class B insulation, it is normal for the motor surface temperature to reach 50°C–70°C during continuous operation. Ensure adequate airflow or mount the motor to a metal chassis to act as a heat sink. Integration Guide Recommended Drivers

To get the most out of this motor, use a constant-current (chopper) driver. A4988 / DRV8825: Ideal for hobbyist 3D printers and CNCs.

TMC2208 / TMC2209: Recommended for "Silent Step" applications where noise reduction is a priority. Part 1: Decoding the Model Number – BJ42D15

TB6600: Better suited for industrial setups requiring rugged housing. Microstepping

While the native step angle is 1.8°, utilizing 1/16 or 1/32 microstepping will significantly reduce resonance and vibration, resulting in smoother motion and higher positioning resolution.

📌 Note: Always adjust the current limit (Vref) on your stepper driver to match the 1.0A rating of this motor to prevent overheating or skipped steps. BJ42 : This prefix typically indicates the motor

Part 1: Decoding the Model Number – BJ42D15 26V10

Before diving into graphs and torque curves, let us break down what this nomenclature actually means. Understanding your component’s labeling is the first step toward successful integration.

BJ42 : This prefix typically indicates the motor family and frame size. "BJ" often refers to a bipolar junction series from specific Asian manufacturers (commonly Jangzhou or similar OEMs). "42" denotes the NEMA 17 standard—the front faceplate measures 42mm x 42mm.
D15 : This refers to the stack length or rotor length. The "15" indicates a 15mm rotor stack height. This is a short-to-medium stack motor, balancing torque with physical size.
26V10 : This is the crucial performance identifier. It stands for 26 Volts, 1.0 Amps per phase. Unlike many stepper motors rated for 3V–5V, this motor is designed for higher voltage drive systems, which allows for better high-speed torque retention.

Part 6: How to Verify Your BJ42D15 26V10 Motor

If you have purchased this motor from a non-reputable seller, use the following verification steps.

Part 4: Wiring Diagram & Pinout (Verified)

The BJ42D15 26V10 uses a standard 4-lead bipolar configuration. Incorrect pairing of coils will cause zero rotation or erratic jerking.