This sleeves are uaually made of S45C, S50C, 65Mn etc, of which S45C are commonly material of sleeves The sleeve is not only to keep a certain width between two piece of disc-blades, but also to keep a certain gap between the upper and down blades, normallt the thickness of blades sleeve from 0.9mm-100mm and 47± 2 HRC hardness and the tolerance on thickness should be in 0.003m/mt We can slao produce and supply the sleeve with a fit rubber sleeve on outside diameter of blades, if you have such specifically requirement for your slitting machine line, that will better to prevent scratch slitting blades Normally the material of rubber sleeve are nitrile, polyurethane, which are through harden processing the IRHD is 75-78
