PR20 Series

June 12, 2024
Next-Generation PR20 Series Insert Coating Technology for Grooving Applications

KYOCERA is proud to introduce the groundbreaking PR20 Series insert coating technology for indexable grooving tools, designed specifically for machining steel, stainless steel, and cast iron.

Featuring Kyocera’s proprietary MEGACOAT NANO EX coating technology, this next-generation PVD coating delivers exceptional performance across various grooving applications. MEGACOAT NANO EX is engineered with high-content aluminum nano layers, providing stable high-temperature hardness and exceptional wear and oxidation resistance. These attributes translate to significantly enhanced tool life and reliability, even under the most demanding machining conditions.

Currently available for Kyocera’s popular GBA external and SIGE internal grooving systems, the new PR20 Series ensures precision and longevity in every cut. The innovative multi-layered structure of MEGACOAT NANO EX not only increases the durability of the inserts but also maintains superior cutting performance throughout extended use. By optimizing the balance between hardness and toughness, these new grades set a new standard across a variety of grooving operations, helping machinists achieve consistent, high- quality results while reducing tool changeovers and downtime.

Features & Benefits:

  • PR2015 - 1st recommendation for steel and cast iron with excellent balance of hardness, toughness and


  • PR2025 - Stability oriented for steel and 1st recommendation for stainless steel with excellent fracture

    resistance and high stability for interrupted machining

  • Excellent surface finish

  • Superior wear and fracture resistance

  • High temperature hardness and plastic deformation resistance

  • Special nano coating layer with high aluminum content

  • Suppresses hexagonal crystal precipitation and achieves excellent oxidation resistance

    PR20 for GBA External Grooving Series:

    • Available Groove Widths: 0.013” – 0.189” | 0.33mm – 4.8mm

    • Available Groove Depths: 0.031” – 0.197” | 0.8mm – 5.0mm

    • 3-edge inserts available in ground chipbreaker, molded chipbreaker, or full radius styles

    • Learn more about the GBA Series

      PR20 for SIGE Internal Grooving Series:

      • Available Groove Widths: 0.039” – 0.197” | 1mm – 5mm

      • Available Groove Depths: 0.059” – 0.256” | 1.5mm – 6.5mm

      • 2-edge inserts available in ground chipbreaker, molded chipbreaker, or full radius styles

Related Glossary Terms

  • chipbreaker


    Groove or other tool geometry that breaks chips into small fragments as they come off the workpiece. Designed to prevent chips from becoming so long that they are difficult to control, catch in turning parts and cause safety problems.

  • grooving


    Machining grooves and shallow channels. Example: grooving ball-bearing raceways. Typically performed by tools that are capable of light cuts at high feed rates. Imparts high-quality finish.

  • hardness


    Hardness is a measure of the resistance of a material to surface indentation or abrasion. There is no absolute scale for hardness. In order to express hardness quantitatively, each type of test has its own scale, which defines hardness. Indentation hardness obtained through static methods is measured by Brinell, Rockwell, Vickers and Knoop tests. Hardness without indentation is measured by a dynamic method, known as the Scleroscope test.

  • physical vapor deposition ( PVD)

    physical vapor deposition ( PVD)

    Tool-coating process performed at low temperature (500° C), compared to chemical vapor deposition (1,000° C). Employs electric field to generate necessary heat for depositing coating on a tool’s surface. See CVD, chemical vapor deposition.

  • plastic deformation

    plastic deformation

    Permanent (inelastic) distortion of metals under applied stresses that strain the material beyond its elastic limit.


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