... 820006SM39ST44-0304ASM39ST44-0304B120.3280044025044Products Options:Torque: 2.5 to 5,700 Ounce-InchesStep Angle:1.8 and 0.9,3.6 Degree ... ,Square-Bodied, High-Torque Stepper Motors. Round version, Standard stepper motors.Phase:2,3 ... 24, 34 and 42Frame size: 20mm, 28mm, 35mm, 39mm, 42mm, 57mm, 60mm, 86mm, 110mm, 130mm Nema 16 hybrid stepping motor, Frame size 39mm, CE and ROHS ...