21.0 kg-cm 6 Wire NEMA 23 Stepping Motor (57BYGH405A) Motor Frame size: NEMA 23 Holding Torque: 20 kg.cm / 277 oz.in - Step Angle: 1.8 Deg  5 Insulation Resistant: 500VDC 100M Min. - Insulation Strength: 50Hz 1Minute 500V Min. Ambient Temperature: -20 ~ 50 - Operating Temperature: 110C Max. Radial Play: 0.02mm Max. - End Play: 0.1-0.3mm