This is a short geared NEMA 17 Stepper motor. It has an integrated planetary gearbox with a 26.85:1 gear ratio, the resolution reach 0.067 deg. step angle. It's a good solution in applications that need very low rotation speeds and/or lots of torque. Electrical Specification: * Manufacturer Part Number: 17HS13-0404S-PG27 * Motor Type: Bipolar Stepper * Step Angle: 0.067 deg. * Holding Torque: 3Nm * Rated Current/phase: 0.4A * Phase Resistance: 30ohms * Inductance: 34mH+/-20%(1KHz) Gearbox Specifications: * Gearbox Type: Planetary * Gear Ratio: 26.85:1 * Efficiency: 81% * Backlash at No-load: <=1 deg. * Max.Permissible Torque: 3Nm(425oz-in) * Moment Permissible Torque: 5Nm(708oz-in) * Shaft Maximum Axial Load: 50N * Shaft Maximum Radial Load: 100N Physical Specifications: * Frame Size: 42 x 42mm * Motor Length: 34mm * Gearbox Length: 35mm * Shaft Diameter: 6mm * Shaft Length: 18mm * D-cut Length: 12mm * Number of Leads: 4 * Lead Length: 500mm * Weight: 420g Connection: Black(A+), Green(A-), Red(B+), Blue(B-) Warning: Make sure the motor connect to a constant current or chopper drive controller before you test motor. Connecting the motor directly to a power supply will destroy the motor.

Rated current 0.4A & resistance 30ohms. Planetary Gearbox Ratio 26.85:1. NEMA 17 bipolar 4-wire. 0.067 deg. Step Angle. Good Torque Good Speed.

Item Weight: 0.96 Pounds. Material: Aluminum , Alloy Steel, Metal, Copper. Item Dimensions LxWxH: 1.67 x 1.67 x 2.72 inches. Brand: STEPPERONLINE. Manufacturer: OSM Technology Co.,Ltd. Is Discontinued By Manufacturer: No. Customer Reviews: 4.8 out of 5 stars 10 ratings 4.8 out of 5 stars. Best Sellers Rank: #58 in Telescope Motor Drives. Item model number: 4332013340. : B00PNER7JA. Item Weight: 15.4 ounces. Product Dimensions: 1.67 x 1.67 x 2.72 inches.