FOR NEMA 17 bipolar 1.65 inchx1.65 inchx0.79 inch 4-wire_x000D__x000D_This is Short Height FOR Bipolar Nema 17 stepper motor with 1.8 . step angle (200 steps/revolution)._x000D__x000D_Each phase draws current 1A, allowing for a holding torque of 13Ncm(18.4oz.in)._x000D__x000D_Manufacturer Part Number: 17HS08-1004S_x000D__x000D_Motor Type: Bipolar Stepper_x000D__x000D_Step Angle: 1.8._x000D__x000D_Rated Current/phase: 1.0A_x000D__x000D_Phase Resistance: 3.5ohms_x000D__x000D_Inductance: 4.5mH+/-20%(1KHz)_x000D__x000D_Frame Size: 42 x 42mm_x000D__x000D_Body Length: 20mm_x000D__x000D_Shaft Diameter: 5mm_x000D__x000D_Shaft Length: 20mm_x000D__x000D_D-cut Length: 16.5mm_x000D__x000D_Number of Leads: 4_x000D__x000D_Lead Length: 400mm_x000D__x000D_Weight: 140g_x000D__x000D_Connection:_x000D__x000D_Black(A+), Green(A-), Red(B+), Blue(B-)_x000D__x000D_Warning:_x000D__x000D_Make sure the motor connect to a constant current or chopper drive controller before you test motor._x000D__x000D_Connecting the motor directly to a power supply will the motor._x000D__x000D_Color: Silver_x000D__x000D_material: metal_x000D__x000D_size:42*42mm_x000D__x000D_Package Contents:_x000D__x000D_2 * stepper motor_x000D__x000D__x000D__x000D_