Milling Cutters for Deep Cuts, High Volumes

The new Xtra·tec®S3 line of milling cutters feature a patent-pending chip space design that allows reliable chip evacuation, with vibration-damping chip-flute design and up to three coolant channels per insert seat.
May 6, 2026
2 min read
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Walter Tools
Walter Tools M6420 milling cutter

The innovative design of the M6420 enables reliable chip removal as well as high cutting depths and productivity across a wide range of materials.

WALTER TOOLS is expanding its indexable insert milling cutter range with the Xtra·tec® S3 series, a new line of milling cutters, thereby responding to market demands: greater cutting depths, higher feed rates, and maximum stability—even under difficult cutting conditions or with unstable workpieces. 

The name S3 signifies the line’s three core advantages: Stability, supply, and selection. As the first tool in the series, the new M6420 high-feed milling cutter already meets these requirements with a patent-pending new chip space design that allows reliable chip evacuation even with high chip volumes. This allows large amounts of chips to be safely evacuated, particularly during roughing of a wide variety of ISO materials.

The “stability” of the new series is achieved through an innovative, patent-pending, vibration-damping chip-flute design. The cutter body itself has up to 30% higher rigidity (according to FEM analysis), which in turn extends tool life. High cutting forces acting on the cutter body, particularly during high-feed milling strategies, are effectively minimized. In combination with the large contact and support surfaces of the M6420, feeds of up to 3 mm per tooth also can be reliably achieved.

Another decisive factor for the performance and long tool life is the optimized coolant “supply”: With up to three coolant channels per insert seat, the milling cutter makes maximum use of the coolant volume available from the machine without any loss of pressure. The targeted supply increases the coolant volume by 48 percent, which lowers the temperature at the cutting edge while ensuring efficient chip removal—especially at high feed rates and large cutting depths.

To simplify handling in everyday production, Walter relies on a user-friendly, intuitive “selection” system for the S3 series based on a self-explanatory nomenclature of insert geometries: L5 (= Light-cutting geometry), M5 (= Medium geometry), and R5 (= Roughing geometry). The easy identification via the initial letters improves handling. With four cutting edges per insert and wear-resistant Tiger·tec® Gold grades, Walter increases cost-effectiveness.

Learn more at www.walter-tools.com