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 BSHB31112 step angle: 1.2deg length: 124.5mm current: 2.5A holding torque: 8N.m Power supply: 220VAC 3.5A Net weight: 5Kg BSHB31115 step angle: 1.2deg length: 148mm current: 3.5A holding torque: 12N.m Power supply: 220VAC 3.5A Net weight: 6.6Kg BSHB31118 step angle: 1.2deg length: 182mm current: 3.75A holding torque: 16N.m Power supply: 220VAC 3.5A Net weight: 9Kg BSHB31122 step angle: 1.2deg length: 216mm current: 4A holding torque: 20N.m Power supply: 220VAC 3.5A Net weight: 11.1Kg www.bsjd.com for more types of electric stepper motor for CNC kits bs@ bsjd.com for price inquiry ( Rachel Lin)