When your task demands precision drilling in metal, the Dormer Pramet A110 9.90 mm HSS straight shank long series drill delivers dependable performance with every hole. Built for depth and durability, this DIN 340-compliant drill bit is the smart choice for engineers, fabricators, and workshop technicians who routinely push for deeper reach without compromising accuracy.

Why the A110 9.90 mm drill stands out

• 118-degree conventional point — A strong, self-centering tip makes starting holes easier and reduces wandering. The geometry is straightforward to re-grind, extending usable life between sharpenings and keeping you productive on demanding jobs.
• Steam oxide finish — This surface treatment minimizes material adhesion at the cutting edge, promoting smoother chip evacuation and reducing built-up edge. Expect cleaner holes and fewer interruptions to clear chips.
• Long length series — Designed for deep-hole applications and situations where extended reach is essential. The extra length provides flexibility in manual drilling and on machines where space is constrained, without sacrificing rigidity.
• Premium HSS material — High-speed steel combines toughness and wear resistance, making the drill suitable for a broad range of metals, including steel, aluminium, and stainless steel. It’s a versatile option for mixed-metal projects and multi-material assemblies.
• DIN 340 straight shank — The standardized shank ensures compatibility with a wide array of drill chucks and collets, delivering reliable grip and consistent performance in both handheld and machine-driven setups.

Contexts where this drill excels

Ideal for fabrication, maintenance, and prototype work where you need to bore deeper holes without changing tooling. Use cases include drilling deep clearance holes in steel brackets, penetrating thick aluminum profiles, or creating through-holes in stainless assemblies where accuracy and edge life matter. The long length is particularly advantageous in manual drilling scenarios where extended reach reduces the need for additional tools or extensions.

Practical guidance for best results

• Match speed and feed to the material: moderate speeds with steady feeds help maintain tip integrity and minimize deflection in longer holes.
• Keep the bit well-lubricated for metals with higher friction, such as stainless steel, to extend tool life and improve hole quality.
• Resharpen when the point shows noticeable dulling or chip evacuation slows; the 118° point regrinds relatively well, preserving hole symmetry.
• For deep-hole work, prefer pecking cycles to break chips and prevent buildup that can reduce hole diameter accuracy.
• Ensure the workpiece is properly secured and aligned; even with a self-centering point, misalignment amplifies drill wander in longer holes.

With the Dormer Pramet A110 9.90 mm drill, you’re choosing a reliable, versatile solution that pairs a robust tip with a long-reach design. It’s a practical upgrade for shops tackling mixed-material projects, where a single tool must perform consistently across steel, aluminum, and stainless components—both on handheld drills and on machine stations.