• Steel: SUJ2 (High-carbon bearing steel: After heat treatment, it has rigid hardness and toughness, better grinding quality, good flexibility, and longer using life span.)
• HRC: 46
• AT3: 8
• Surface roughness: within RZ2.5
• Chucking range: ER8, ER11= 0.5mm
• ER16, 20, 25, 32, 40= 1mm. But if the internal
hole is less than 2.5mm, the chucking range will be 0.5mm.
• The internal hole is manufactured by precise honing.
• The concentricity is totally examined according to DIN- norm. There are three kinds of classes for precision: general class 0.02mm, A class 0.01mm, and UP class 0.005mm.
• UP class is recommended to be used with HSP clamping nut. It will have better stability.
• It is used for the cutting tools like drills, taps, mills, and reamers, etc.
• It has flexibility and can be applied widely and variably.