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CoroTurn® Prime

Extraordinary productivity for internal turning applications

With the CoroTurn® Prime SL head solution it is now possible to use our PrimeTurning™ methodology for internal turning. The inside-out machining capability allows for excellent chip evacuation and chip control.

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The geometry for excellent chip control in ductile materials

The -L3 geometry is optimized for finishing to semi-finishing operations in unstable setups and for machining slender components that require lower feed rates.

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Fast tool indexing

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

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View More Features
  • ​Flexibility to do turning in all directions
  • Wiper insert available for excellent surface finish
  • Double 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
Small entering angles

The small entering angle (KAPR) will create a thin and wide chip that 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 at the insert tip. It also moves heat away from the cutting zone, helping inserts last substantially longer.

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Find your tool and buy

Application area

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
  • Good choice for mass production or components needing frequent setups and tool changes
  • External turning: best suited for short and compact components and slender components using tail stock
  • Internal turning: for diameters above 40 mm (1.575 inch) and overhangs up to 8–10 × D
  • Steel
  • Stainless steel
  • Cast iron
  • Heat resistant super alloys

Product range

Coromant Capto®

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")

SL head

Size: SL32 and SL40

A-type insert

Grades: GC4425, GC4415, GC2025, GC1115 and H13A
Geometries: -L5, -L5W, -L3 and -L3WX
Insert shape: 35° corner

B-type insert

Grades: GC4425​, GC2025, GC1115 and H13A
Geometries: -M5, -M5W, -H3, -H3W, -L4 and -L4W
Insert shape: 80° corner (as CNMG)

CoroPlus® ToolPath software

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

CoroPlus® ToolPath for PrimeTurning™  

CoroPlus® ToolPath software

The CoroPlus® ToolPath software (previously known as PrimeTurning™ code generator) supplies programming codes and techniques to secure maximum output for PrimeTurning™ applications. It is compatible with various CNC machines that use ISO codes.

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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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An amazed technophile

Passionate about cutting-edge technology, fast-growing Slovenian metal company Riedl CNC introduced Sandvik Coromant’s new PrimeTurning™ solution in 2018. When the company applied it to KTM motorcycle components, productivity increased 40 percent and costs declined by more than 50,000 euros a year.

Increase output in steel turning

Steel turning often means continuously refining your machining processes. Small improvements in your turning strategy can make a big difference. Explore new technologies and methods that can give you an edge over the competition.

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