hort Height: 13Ncm(18.4oz.in) holding torque FOR NEMA 17 bipolar 1.65 inchx1.65 inchx0.79 inch 4-wire 1.8 . step angle(200 steps/), Rated current 1.0A & resistance 3.5ohms This is Short Height FOR Bipolar Nema 17 stepper motor with 1.8 . step angle (200 steps/revolution). Each phase draws current 1A, allowing for a holding torque of 13Ncm(18.4oz.in). Electrical Specification: Manufacturer Part Number: 17HS08-1004S Motor Type: Bipolar Stepper Step Angle: 1.8 . Holding Torque: 13Ncm(18.4oz.in) Rated Current/phase: 1.0A Phase Resistance: 3.5ohms Inductance: 4.5mH+/-20%(1KHz) Frame Size: 42 x 42mm Body Length: 20mm Shaft Diameter: 5mm Shaft Length: 20mm D-cut Length: 16.5mm Number of Leads: 4 Lead Length: 400mm Connection: Black(A+), Green(A-), Red(B+), Blue(B-) Warning: Make the motor connect to a constant current or chopper drive controller before you test motor. Connecting the motor directly to a power supply will the motor. size: 42 x 42mm Material: Metal colour: silvery Package Contents: 10 x stepper motor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.