Stepping accuracy...5% Temperature rise...80 Max Ambient temperature...-20 C-+ 50 C Insulation resistance...100Mohm Min 500VDC Dielectric strength...500V AC 1minute Models Brief Specifications BSHB31318 step angle: 1.2deg length: 183mm current: 4A holding torque: 20N.m Power supply: 220VAC 4.5A Net weight: 14.1Kg BSHB31322 step angle: 1.2deg length: 215mm current: 4A holding torque: 28N.m Power supply: 220VAC 4.5A Net weight: 17.2Kg BSHB31325 step angle: 1.2deg length: 247mm current: 4A holding torque: 35N.m Power supply: 220VAC 4.5A Net weight: 20Kg www.bsjd.com for more types of stepper motor bs@ bsjd.com for price inquiry ( Rachel Lin)