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CoroThread® 254 is your first choice for demanding external and internal grooving operations. The slotted insert sits rigidly on the T-rails in the pocket eliminating any insert movement caused by the cutting force variations.



  • High indexing repeatability
  • Stable solution with low risk of vibrations
  • Cost efficient solution with three cutting  edges
  • Easy clamping of new inserts due to the iLock interface



  • External and internal grooves
  • Sharp cutting edges for high quality grooves
  • Insert is easy to identify – groove width is imprinted on the insert
  • Same tool holder for many insert widths



  • Grooving in low to medium feeds
ISO application area





CoroThread 254 is ideal for internal and external grooves with 1.10-4.15 mm (0.043-0.163 inch) widths (standardized circlip grooves).

GC1135 is a versatile grade with sharp edges and positive geometry for low cutting forces.

Tool holding

CoroThread 254 is available with the following tool holding systems:

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