ISO6431 SI standard cylinder 1. Bore size:32-250mm 2. Stroke : 25-1000mm 3.Working pressure: 1-9bar ISO6431 SI series standard cylinder, air cylinder widely used in machinery industry.bore size:32,40,50,63, 80,100mmdouble acting, with adjustable air cushionbuilt-in magnet is available. long service of life, easy to control and maintain. SI standard cylinder