Solid-Carbide Drill produces burr-free holes in CFRP-metal stacks.

Press Release Summary:

Used for drilling composite fiber-reinforced polymer (CFRP)-metal stacks in hole diameter ranges of 3/16–5/8 in., B55_DAL operates with standard through coolant, MQL, or dry. Double-angle point design lends to centering capability, while sharp edge cleanly cuts CFRPs in top layer of stacks and cleanly exits titanium or aluminum side. Stack drill can be applied in all combinations of stacks, and fine-grain solid-carbide Beyond™ KN15™ grade is polished for optimal chip evacuation.

Original Press Release:

New Solid-Carbide Drill from Kennametal for CFRP/Titanium-Stack

Geometry maximizes performance, minimizes burrs and delaminationNew stack drill from Kennametal for aerospace composite/titanium stacks can operate with through-coolant or without for superior chip evacuation.

Kennametal is introducing its all-new B55_DAL Drill for drilling CFRP-metal stacks in hole diameter ranges of 3/16–5/8“ (4.763–15.875mm). The drill can be applied in all combinations of stacks: CFRP-Ti-Al as well as CFRP-Ti, CFRP-Al, and also straight Ti or Al. These drills can operate with standard through coolant, MQL, or even dry.

New materials are demanding new solutions. To maximize strength and minimize weight, the aerospace industry continues to research using stacks of composite fiber-reinforced polymers (CFRP) sandwiched between titanium or other materials. This provides essential performance at reduced weight for wings, fuselages, cockpits, and many other components. Due to the substantially different mechanical properties of carbon fibers and metals, drilling fastener holes efficiently challenges cutting tools by requiring high wear resistance and optimum tool geometries. Keeping holes high-quality and burr-free is critical.

The new B55_DAL drill’s double-angle point design provides excellent centering capability and the sharp edge to cleanly cut CFRPs in the top layer of stacks and cleanly exit the titanium or aluminum side without burrs. The fine-grain solid-carbide Beyond™ KN15™ grade is highly polished for superior chip evacuation even with MQL or dry operation.

A broad range of diameters and length variations are available to accommodate all holemaking operations, even those using robots or automated drilling units. In addition, the new stack drills can be reground to original process specifications, making these new tools even more cost-efficient.

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Celebrating its 75th year as an industrial technology leader, Kennametal Inc. delivers productivity to customers seeking peak performance in demanding environments. The company provides innovative wear-resistant products, application engineering and services backed by advanced material science, serving customers in 60 countries across diverse sectors of aerospace, earthworks, energy, industrial production, transportation and infrastructure. With approximately 14,000 employees and nearly $3 billion in sales, the company realizes half of its revenue from outside North America, and 40% globally from innovations introduced in the past five years. Recognized among the »World´s Most Ethical Companies» (Ethisphere); »Outstanding Corporate Innovator» (Product Development Management Association); and "America's Safest Companies" (EHS Today) with a focus on 100% safety, Kennametal and its foundation invest in technical education, industrial technologies and material science to deliver the promise of progress and economic prosperity to people everywhere. For more information, visit the company´s website at

Kennametal Shared Services GmbH
Wehlauer Strasse 73
D-90766 Fuerth
Phone: +49 911 9735 557
Fax: +49 911 9735 551

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