hort Height: 13Ncm(18.4oz.in) holding FOR NEMA 17 bipolar 1.65 inchx1.65 inchx0.79 inch 4-wire1.8 . step angle(200 steps/), Rated current 1.0A & resistance 3.5ohmsThis is Short Height FOR Bipolar Nema 17 with 1.8 . step angle (200 steps/revolution).Each phase draws current 1A, allowing for a holding of 13Ncm(18.4oz.in).Electrical Specification:Manufacturer Part Number: 17HS08-1004SMotor Type: Bipolar StepperStep Angle: 1.8 .Holding : 13Ncm(18.4oz.in)Rated Current/phase: 1.0APhase Resistance: 3.5ohmsInductance: 4.5mH+/-20%(1KHz) Size: 42 x 42mmBody Length: 20mmShaft Diameter: 5mmShaft Length: 20mmD-cut Length: 16.5mmNumber of Leads: 4Lead Length: 400mmConnection:Black(A+), Green(A-), Red(B+), Blue(B-)Warning:Make the motor connect to a constant current or chopper drive controller you test motor.Connecting the motor directly to a power supply will destroy the motor.size: 42 x 42mmMaterial: Metalcolour: silveryPackage Contents:10 x 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.