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CoroThread® 266

Wide profile assortment

​Wide profile assortment with grades and geometries covering a majority of materials and applications.

iLock™ interface

​Unique iLock interface provides excellent stability and positioning accuracy when high cutting forces are placed upon the insert.

Precision coolant solution

​Precision over and under coolant ensures improved chip control and better process security for external thread turning. Effective from low to high coolant pressures.

View more features
  • Coromant Capto® cutting units and QS™ shanks enable quick tool change and easy coolant connection for maximized production time
  • Dedicated damped Silent Tools™ adaptors reduce vibration in long overhangs
  • Three sharp insert cutting edges for high-quality threads
  • Multi-point inserts available, providing increased productivity with fewer passes

Find your tool and buy


  • First choice for external and internal thread turning
  • Wide standard assortment of thread profiles with dedicated grades and geometries for all materials
  • Tailor Made offer for extended thread profile assortment
  • Minimum internal hole from 20 mm (0.787 inch)
  • Steel
  • Stainless steel
  • Cast iron
  • Non-ferrous metals
  • Heat resistant super alloys
  • Hardened materials

Product range

Coromant Capto® holders

External and internal threading

Sizes: C3, C4, C5, C6

QS™ shanks

External threading

Sizes: 1212, 1616, 2020 and 2525 mm, 8 (1/2), 10 (5/8), 12 (3/4×3/4) and 16 (1×1) (inch)


External threading

Sizes: 1010 to 4040 mm and 6 to 24 (3/8 to 1 ½ inch)

Boring bars

Internal threading

Diameter: 16 to 50 and 10 to 32 mm (5/8 to 2 inch)

SL heads

External and internal threading
Diameter: 20‒40 mm, 80 mm (0.787‒1.57 inch, 3.15 inch)


Grades: GC1020, GC1125 and GC1135
Geometries: A, C and F
Thread profiles: V profile 60°, V profile 55°, M, UN, WH, NT, PT, NF, RN, RD, BU, MJ, NJ, TR, AC, SA 
Insert sizes: 16, 22, 27

Tailor Made

Tailor Made options available for extended offer of insert thread profiles.

Precision coolant directly to the cutting zone

The precision over- and under coolant solution is an important aspect for improved process security and trouble-free machining.

Precision coolant from above controls the chip breaking for secure machining, while under coolant controls the temperature for long and predictable tool life. This paves the way for higher machining efficiency and high component quality.


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Demo: Threading with CoroThread 266

View CoroThread 266 in action.

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Get to know CoroThread 266

See why CoroThread 266 is first choice for thread turning in this animation.

Inserts and grades

Find out which inserts work best for your operation.

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