Main Technical Parameter Project SK560?530 SK610?720 SK660?130 SK660?300 XK660?300 Front/back roll diameter(mm) φ560 φ610 φ610 φ660 φ660 Working length(mm) 1530 1720 2130 2300 2300 Front/back velocity ratio 1:1.27 1:1.27 1:1.27 1:1.17 1:1.17 Power of motor(kw) 75kw 90kw 132kw 132kw 220kw Motor speed(rpm) 740 740 1500 1500 1500 Reducer speed box Hard toothed Hard toothed Hard toothed Hard toothed Hard toothed Velocity ratio 1:36.7 1:36.7 1:36.7 1:40 1:40 Bearing Double diagonal column type Lubrication mode Compulsory Lubrication Weight 17 18 22 26 28