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CoroTurn® Prime

All-directional turning

Small entering angles

The small entering angle (KAPR) will create a thin and wide chip which spreads the load and heat away from the nose radius. This results in increased tool life or allows for increasing cutting data.

Entering and lead angles:

A-type KAPR = 30°, PSIR = 60°
B-type KAPR = 25°, PSIR = 65°

Efficient edge utilization

​CoroTurn® Prime inserts have three edges per corner. One edge each for longitudinal, facing and profiling thus distributing the wear over a longer edge and not just the insert tip. It also moves heat away from the cutting zone helping inserts last substantially longer.

No chip jamming

​PrimeTurning™ method enables turning away from the shoulder thus eliminating the possibility of chip jamming as commonly observed in conventional turning. This results in an excellent surface finish and avoids tool damage.

View more features

Flexibility to do turning in all directions

Wiper insert available for excellent surface finish

Double the speed and feed rates enable faster metal removal

Shim-protected tip seat for security

TR-style locking interface for stability

Over and under coolant with Coromant Capto® holders and QS™ shanks

Application area

External turning operations in all-directions
  • CoroTurn Prime A-type tool with three 35° corners designed for light roughing, finishing and profiling
  • CoroTurn Prime B-type tool with strong corners designed for rough machining
  • Machines: Turning centres and multi-task machines
  • Best suited for short and compact components and the slender ones using tail stock
  • Good choice for mass production or components needing frequent set-ups and tool changes
  • Steel
  • Heat resistant super alloys
  • Stainless steel

PrimeTurning™ code generator

Secure maximum output with PrimeTurning code generator that supplies programming codes and techniques to set up proper parameters and variables for a particular application. It is compatible with various CNC systems.

Learn more



Does PrimeTurning™ fit my production?

We are introducing a completely new turning concept, including method and tools, unlike anything ever seen before.

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See it to believe it

Doubling speed and feed rates enable faster metal removal for more parts per run.

Connected solutions for CAM programming

The Mastercam® 2018 release includes turning strategies supporting the new innovative PrimeTurning™ methodology for highly productive turning in all directions, as well as integration of CoroPlus® ToolLibrary.

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