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CoroTurn® Prime

Small entering angles

Efficient edge utilization

​CoroTurn® Prime inserts have three edges per corner. One edge each for longitudinal, facing, and profiling, 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.

Fast tool indexing

With two inserts in the holder, the new CoroTurn® Prime Twin-tool saves significant time when changing tools to increase machine utilization and productivity.

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Flexibility to do turning in all directions

Wiper insert available for excellent surface finish

Double the speed and feed rates to 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 centers, vertical lathes, and multi-task machines
  • Best suited for short and compact components and slender ones using tail stock
  • Good choice for mass production or components that require frequent setups and tool changes
  • Steel
  • Stainless steel
  • Cast iron
  • Heat resistant super alloys

Product range

Coromant Capto<sup>®</sup>

Tool holders
Radial holders, size: C4, C5, and C6
Axial holders, size: C5 and C6
Multi-task holders, size: C5, C6, and C8
Multi-task Twin-tool holders, size: C6 and C8

QS™ shanks

Sizes: 2020, 2525, 12 (¾"), and 16 (1")


Sizes: 2020, 2525, 3232, 12 (¾"), 16 (1"), and 20 (1 ¼")

A-type insert

Grades: GC4325, GC2025, and GC1115
Geometries: -L5 and -L5W
Insert shape: 35° corner

B-type insert

Grades: GC4325, GC2025, and GC1115
Geometries: -M5 and -M5W
Insert shape: Tip-shaped as CNMG

PrimeTurning™ code generator

Indigenously designed software generating correct and optimized NC codes to speed up turning operations

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. Compatible with various CNC systems.

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See it to believe it

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

Does PrimeTurning™ fit my production?

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

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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