Dormer Pramet A940 10.00 mm HSS-E High Performance Multi-Application Straight Shank Long Series Drill DIN/ANSI is engineered for machinists who demand consistency, accuracy, and efficiency across a broad range of materials. Built around a premium HSS-E composition, this drill thrives in everyday production as well as tougher applications where reliability matters most. Its design isn’t about one-off performance—it’s about sustained, repeatable results drill after drill.

Key features that drive real-world performance

• 130-degree point—a precise geometry that promotes self-centering and reduces the push force required to start a hole. The result is cleaner entry, fewer walk-offs, and tighter hole location accuracy, even when working with challenging workholding or uneven stock.
• Bright finish—the surface treatment minimizes material adhesion at the cutting edge, helping chips evacuate more freely and reducing clogging, which translates to smoother drilling and longer tool life.
• Parabolic flute design—the unique flute profile is optimized for deep-hole drilling in a single pass. This minimizes the need for pecking, lowers cycle times, and improves hole straightness and surface finish in long, through-holes.
• Premium HSS-E material—a robust high-speed steel with enhanced performance for drilling a variety of metals, including carbon steel, aluminum, and stainless steel. The toughness and hot-hardening properties help resist wear and maintain sharpness under demanding feeds and speeds.
• Long series, straight shank—designed for compatibility with standard drill chucks and holders, offering dependable alignment and power transfer in CNC or manual setups. The straight shank supports stable machining at higher speeds and feeds.
• High-precision H10 hole tolerance—delivers consistently accurate hole diameters suitable for close-fitting components, bushings, and assemblies that require tight dimensional control.

Why this drill stands out in real-world use

• Versatility across materials means you don’t need a separate drill for steel, aluminum, and stainless—the A940 handles a wide spectrum without sacrificing performance.
• The combination of a self-centering point and improved chip evacuation reduces the chance of drill exit splintering or premature edge wear, especially on thinner or tougher workpieces.
• The parabolic flute design shines in applications that demand deep penetration. In setups with limited drilling depth, you’ll notice fewer tool changes and more consistent hole quality from the first hole to the last.
• Compared to generic high-speed drills, the A940’s straight shank and DIN/ANSI compatibility offer reliable acceptance in both aftermarket and OEM tooling ecosystems, ensuring smooth integration into existing tooling inventories.

Ideal use scenarios

• Production runs drilling through carbon steel plates or structural components where fast cycle times and clean, accurate holes matter.
• Fabrication work involving aluminum extrusions or profiles where light, chip-free entry reduces rework and improves finish quality.
• Stainless steel assemblies in which hole tolerances must be tight and consistent across multiple stations or machines.
• Deep-hole drilling tasks where a single pass with reliable chip evacuation minimizes tool wear and downtime.

Practical setup tips

• Choose appropriate speeds and feeds that align with HSS-E capabilities—start conservatively and increase gradually to balance surface finish and tool life.
• Use a suitable cutting fluid or coolant when drilling metals prone to work-harden or thermal buildup to extend edge life and maintain accuracy.
• Ensure proper workholding and steady maintenance of concentricity to maximize the A940’s self-centering advantage and minimize deviation.
• Inspect the flute and cutting edge after campaigns of heavy use; the parabolic flute design rewards consistent sharpening and reconditioning for continued deep-hole performance.