·Material:SUJ2(High-carbon bearing steel:after heat treatment,it has rigid hardness and toughness,better grinding quality,good flexibility,and longer useful life)
·Surface roughness:within RZ2.5
·The internal hole is manufactured by precise honing
·The concentricity is totally examined according to DIN norm.There are three classes of precision : A class 0.01mm and UP class 0.005mm
·It is used for the cutting tools like drills,taps ,mills and reamers ,etc.
·It has flexibility and can be applied widely and variably
·Please inform the required precision when ordering