ITEM NAME:Nema8 4 Lead CNC Router Mill Stepping Stepper Motor 34mm 0.6A 2.5oz.in N3I4 Nema8 4 Lead CNC Router Mill Stepping Stepper Motor 34mm 0.6A 2.5oz.in N3I4 Product Name : Stepper Motor Model No. : 20HS3406A4 Frame Size : 20 x 20mm (Nema 8) Step Angle : 1.8Â ° Rated Current : 0.6A Motor Resistant : 4.5 Ohm Motor Inductance : 1.2 mH Holding Torque : 1.8 N.cm/ 2.5 oz.in Detent Torque : 0.3 N.cm/ 0.4 oz.in Rotor Inertia : 3.2g.cm2 Shaft Diameter : 4mm/ 0.16inch Shaft Length : 20mm/0.78inch Motor Length : 34 mm/1.3inch Cable Length : 25cm / 9.8inch Mouting Hole Dia : 2mm/0.08Inc Material : Metal Color : Black Weight : 64g Package Content : 1 x Stepper Motor(Non-OEM) Note: Light shooting 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..Step Angle : 1.8Â °. Motor Resistant : 4.5 Ohm. Motor Inductance : 1.2 mH. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.