This is Short Height Bipolar Nema 17 stepper motor with 1.8 deg. step angle (200 steps/revolution). Each phase draws current 1A, allowing for a holding torque of 16Ncm(22.6oz.in).<br /><br /> <b>Electrical Specification:</b><br /><br /> * Manufacturer Part Number: 17HS08-1004S<br /> * Motor Type: Bipolar Stepper<br /> * Step Angle: 1.8 deg.<br /> * Holding Torque: 16Ncm(22.6oz.in)<br /> * Rated Current/phase: 1.0A<br /> * Phase Resistance: 3.5ohms<br /> * Inductance: 4.5mH+/-20%(1KHz)<br /><br /> <b>Physical Specification:</b><br /><br /> * Frame Size: 42 x 42mm<br /> * Body Length: 20mm<br /> * Shaft Diameter: 5mm<br /> * Shaft Length: 20mm<br /> * D-cut Length: 16.5mm<br /> * Number of Leads: 4<br /> * Lead Length: 400mm<br /> * Weight: 140g<br /><br /> <b>Connection:</b><br /><br /> Black(A+), Green(A-), Red(B+), Blue(B-)<br /><br /> Warning:</b><br /><br /> Make sure the motor connect to a constant current or chopper drive controller before you test motor.<br /> Connecting the motor directly to a power supply will destroy the motor. <br /><br />