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This NEMA 11 Stepper motor has an integrated Planetary gearbox with a 5.18:1 gear ratio, the resolution reach 0.35 step angle. It's a good solution in applications that need very low rotation speeds and/or lots of torque. A rear shaft can mount encoder or equals, the rear shaft diameter is 3.9mm. Specification Manufacturer Part Number:11HS12-0674D1-PG5 Motor Type:Bipolar Stepper Step Angle(W/O Gearbox):1.8 Holding Torque:28Ncm Rated Current/phase:0.67A Phase Resistance:5.6ohms Recommended Voltage:12-24V Inductance : 4.2mH±20%(1KHz) Gearbox Type:Planetary Gear Ratio(Exact Gear Ratio):5 + 2/11 Efficiency: 90% Max.Permissible Torque:2Nm(283oz-in) Moment Permissible Torque:4Nm(566oz-in) Shaft Maximum Axial Load:5N Shaft Maximum Radial Load :25N