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WWH320 High-Hardness Milling Insert

For hardened steel above HRC45

The WWH320 is a bronze-coated carbide milling insert built for hardened steel above HRC45. It was developed around one job: keeping a stable edge when the workpiece is hard enough to wear out general-purpose inserts fast.

Hardened steel runs hot at the cutting zone and tends to chip edges under load. The bronze coating helps the insert handle that heat, and the grade is tuned for chipping resistance. In finishing and semi-finishing, that means fewer edge failures, more consistent dimensions, and fewer insert changes during a run.

  • Grade and coating matched to HRC45+ hardened steel
  • Bronze coating for heat and wear resistance at the cutting edge
  • Holds up in finishing and semi-finishing passes
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WWH320 High-Hardness Milling Insert
#255
Highlights
Key Advantages
  • Made for HRC45+ hardened steel, not a general-purpose insert pushed past its limit
  • Bronze coating helps the edge survive the heat that hardened steel generates
  • Chipping resistance keeps edges intact through interrupted and uneven cuts
  • Stable cutting behavior in finishing and semi-finishing, so dimensions stay in tolerance
  • Longer edge life means fewer insert changes and less machine downtime
  • Works for precision milling of hardened dies, molds and machine parts
Use Cases
Applications
  • Finishing passes on hardened steel parts above HRC45
  • Semi-finishing of hardened dies and molds
  • Milling hardened machine components and tooling
  • Face and shoulder milling on hard materials
  • Precision machining of heat-treated steel workpieces
Specs
Technical Specifications
ModelWWH320
Product TypeHigh-Hardness Milling Insert
CoatingBronze coating
Workpiece MaterialHardened steel above HRC45
Application StageFinishing and semi-finishing
Key PropertiesHigh temperature resistance, chipping resistance, strong stability
Details
Detailed Description

WWH320 Milling Insert for Hardened Steel
Model: WWH320, bronze coating.
Application: Milling of hardened steel above HRC45
Features: Specifically designed for ultra-high-hardness hardened materials, high temperature resistance, chipping resistance, strong stability and long service life in hard material finishing and semi-finishing conditions.

FAQ
FAQ
What hardness range is the WWH320 meant for?
It is built for hardened steel above HRC45. That is where it makes the most sense: finishing and semi-finishing passes where a soft general-purpose insert would chip or wear too quickly.
Why does the bronze coating matter?
Hardened steel puts a lot of heat into the cutting zone. The bronze coating helps the insert take that heat and keep wearing evenly instead of breaking down at the edge, which is where tool life usually gets lost.
Can I use it for interrupted cutting?
In many cases, yes. The insert is made with chipping resistance in mind, so it handles a fair amount of interruption. For heavy or very uneven interruptions, send us your cutting conditions first and we will confirm whether WWH320 is the right call.
How do I make sure it fits my tool holder?
Send your tool holder model, the insert geometry you need, and your dimension standard. We will check the matching WWH320 spec and confirm it before you place the order.
What about lead time and quality checks?
Standard items usually ship from stock; production lead time is confirmed when you order. Each batch is checked for dimensions and coating quality, and we can arrange test samples before a larger order.
Stock
Check Stock & Get a Quote
Send your workpiece hardness, tool holder model and the insert geometry you need. We will confirm the right WWH320 spec, give you a lead time and send a price.
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