1) various size rollers 2) 42CrMo4 or 42CrMo 3) no more than 50T 4) Hardness: as your ... GB / T6402-91, JB4730-2000 and JB / T5000.8-1998, or international standard.1. dimesions: diameter ≤1800mm, length ≤15meters and per ... .3. provide certification: DT,UT,MT,PT, tensile test, yeild test, impact test and metallographic test, or inspection by third party. Precision Machining Shaft Roller