NTK Cutting Tools

A ceramic grade optimized for hardened materials.

Excellent performance is achieved by increasing the hardness and strength of the insert substrate. Suitable for hardened materials in the HRC 55–70 range.
Features
  • Excellent wear resistance when machining hardened materials
  • Ideal for finishing applications on hardened materials from 55–70 HRC
  • Gold coating allows easy visual detection of edge wear
Tool application
Turning – Finishing
Grade map

↑High




SPEED
HC4,ZC4 
450HC7,ZC7
HC2,HC5 
  
  
CONTINUOUSLIGHT-INTERRUPT
 FEED

High→

Grade characteristics
Harden material - Finishing
- - - Scroll the table - - -
ISOMaterialCoolantGradevc (m/min) (SFM) ap (mm) (inch) f (mm/rev) (IPR)
Hard Turning Finishing
Continuous cutting
DRY/WETHC4 40 – 200 130 – 660 0.1 – 0.7 .004 – .030 0.07 – 0.2 .003 – .008
Mill Roll
Rough-Finish Turning(CPM)
DRYZC4 120 – 150 400 – 500 0.6 – 2.0 .024 – .080 0.1 – 0.3 .004 – .012
Gear machining
Material :
Carburized and hardened steel
(HRC 63)
Cutting speed :
121 m/min 397 SFM
Feed :
0.03 – 0.04 mm/rev .001 – .002 IPR
DOC :
0.15 mm .006 inch
Coolant :
DRY
ZC4
60 pcs / corner
Competitor’s ceramic
30 pcs / corner

ZC4 has superior wear resistance and twice the tool life extension compared to competitors’ tool.

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