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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 finishing operations in ductile materials

The -L4 geometry is optimized for machining low-carbon and high-strength steel, duplex stainless steel and titanium at low to medium feed rates. Delivers outstanding productivity even at lower feed rates, due to increased cutting speed and/or longer tool life compared to conventional turning.

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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 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
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, 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.

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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 that require frequent setups and tool changes
  • External Turning: Best suited for short and compact components and slender ones using tail stock
  • Internal turning: Large diameters above 90 mm (3.5 inch) and overhangs up to 8–10 × D
  • 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")

SL head

Size: 40 mm (1.575")

A-type insert

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

B-type insert

Grades: GC4325, GC2025, GC1115 and H13A
Geometries: -M5, -M5W, -H3, -H3W, -L4 and -L4W
Insert shape: Tip shaped as CNMG

PrimeTurning™ code generator

Secure maximum output with PrimeTurning™ code generator, which 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.

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A quantum leap

Sandvik Coromant’s new PrimeTurning™ method helped increase productivity and reduce cycle times for an Indian aerospace component manufacturer faced with a challenge in a new order involving a difficult-to-machine steel grade.

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