CCMT 21.51 HM YBC252 Carbide Insert

SKU 424-1022

CCMT 21.51 HM YBC252 Carbide Insert

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SKU 424-1022
Indexable Insert Category Turning Inserts
To be used on alloy steel
application semi-finish
ANSI Number CCMT-21.51-HM
ISO Number CCMT060204HM
Insert Style CCMT
Insert Size 21.51
Inscribed Circle 1/4
Insert Thickness 3/32
Thru Hole 7/64
corner radius 1/64
Insert Grade YBC252
Chip Breaker HM
Material carbide
Coating CVD Al2O3 TICN
Full Details
  • Alloy SteelAlloy Steel

Product Spotlight

YBC252 Black Diamond Carbide Grade


YBC252 comprises of thick layer of TICN and Al2O3 in CVD coating process which yields anti-plastic deformation and strong cutting edge strength.  It's the preferred choice for machining steel from finishing to roughing.  It can achieve stable performance in high chip removal rate and large depth of cut or in adverse working condition, and it can also achieve dry cutting for environmental concerns

Perfect unification of toughness and anti-plastic deformation


The two areas on the outside of the red line are ductile area of rich cobalt layer while the middle section contains cubic carbides of well high-temperature behavior.  This unique skeleton design on the cutting edge improves toughness and anti-plastic deformation.


Improved Surface Roughness

before treatment

 after treatment

           Before Treatment                               After Treatment

Special surface treatment on the insert significantly lower the surface roughness, reduces the bonding between insert surface and work material, effectively improves the stability.

Combination of fibrous TICN and fine grained Al2O3 increases abrasion resistance and anti-chipping.

HM Chip Breaker


preferred choice chip breaker for General Purpose

M Class tolerance double sided chip breaker, suitable for inside boring and outside turning semi-finish/medium on alloy steel and cast iron.