nema 23 Stepper Motor, 1.8 or 0.9 Degree step angle available, 57mm hybrid stepper motor Holding torque from 0.3N.m to 2N.m Model No.RatedVoltageCurrent/PhaseHoldingTorque# of LeadsRotorInertiaWeightDetentTorqueLengthSingle ShaftDouble ShaftVAkg-cmg-cm2kgkg-cmmmSM57HT41-1006AB5.713.961200.450.2141SM57HT41-2006AB2.823.96SM57HT41-3006AB1.933.96SM57HT41-2804AB22.85.54SM57HT51-1006AB6.617.262750.650.3651SM57HT51-2006AB3.327.26SM57HT51-3006AB2.237.26SM57HT51-2804AB2.32.810.14SM57HT56-1006AB7.419.063000.70.456SM57HT56-2006AB3.629.06SM57HT56-3006AB2.339.06SM57HT56-2804AB2.52.812.64SM57HT76-1006AB8.6113.5648010.6876SM57HT76-2006AB4.5213.56SM57HT76-3006AB3313.56SM57HT76-2804AB3.22.818.94 More available Nema Size: NEMA 08, 11, 14, 15, 17, 23, 24, 34 and 42 Frame size: 20mm, 28mm, 35mm, 39mm, 42mm, 57mm, 60mm, 86mm, 110mm, 130mm Step Angle:1.8 and 0.9,3.6 Degree, Square-Bodied, High-Torque Stepper Motors. Round version, Standard stepper motors. Nema 23 motors and suitable drivers