Dormer Pramet A110 3.50 mm HSS ST STRAIGHT SHANK LONG SERIES DRILL DIN 340

The Dormer Pramet A110 3.50 mm HSS ST Straight Shank Long Series Drill (DIN 340) is built for precision metal drilling with remarkable reach. Designed for deeper holes and challenging layouts, this 3.5 mm drill combines reliability with versatility, making it a staple for fabrication shops, DIY enthusiasts, and professional machinists alike.

Why this drill stands out

• 118-degree conventional point – The sharp, robust tip provides clean entry and reduced wander. It’s also straightforward to re-sharpen, so you can extend the life of your tool without compromising accuracy.
• Steam oxide finish – This protective coating minimizes material adhesion to the cutting edge, helping chips break away smoothly and reducing built-up edge for a smoother drilling experience.
• Long length series – Specifically chosen to tackle deeper holes and applications where extended reach is required, while maintaining stability in handheld or machine-driven setups.
• Premium HSS material – High-speed steel offers a balanced combination of hardness and toughness, making it suitable for drilling a range of metals, including steel, aluminum, and stainless steel.
• Straight shank (ST) – Compatible with most drill chucks and machine spindles, delivering reliable grip and minimal runout across both hand-held and automatic drilling operations.
• DIN 340 compliance – Built to industry-standard dimensions and tolerances, ensuring consistent interchangeability and dependable performance across compatible tooling systems.

Ideal uses and practical applications

This drill excels in metalworking tasks where precision, depth, and consistency matter. Use it for:

• Deep-hole drilling in steel components, chassis parts, and structural elements where access is limited to the tip of a long drill.
• Aluminium workpieces in aerospace, automotive fixtures, and general fabrication where fast, clean holes are essential.
• Stainless steel projects that demand a tough, wear-resistant tool capable of maintaining edge integrity over multiple holes.
• Hand-held drilling in benches, drill stands, or machining centers, thanks to its versatile straight shank design.

Tips for best results

• Start with a light pilot to guide the 3.50 mm drill, then feed steadily to the final depth.
• Use even, moderate cutting speed and tracking to preserve the 118-degree point and prevent premature wear.
• Employ appropriate cooling/lubrication for metals with higher hardness, especially stainless steel, to extend tool life.
• Secure the workpiece firmly to avoid deflection, particularly when drilling deep holes with a long drill.