Dormer Pramet A110 21.00 mm HSS ST STRAIGHT SHANK LONG SERIES DRILL DIN 340

The A110 21 mm HSS Straight Shank Long Series Drill (DIN 340) is engineered for serious metalworking tasks where reach and reliability matter. This long-series drill combines a robust tip, precise geometry, and a durable build to tackle deeper holes with confidence.

• Diameter: 21.0 mm, designed for clean, aggressive metal removal in steel, aluminum, and stainless steel.
• Overall length: 261 mm with a flute length of 171 mm, delivering extended reach for deep-hole applications while maintaining rigidity.
• DIN 340 standard with 118° point angle, providing a strong, re-sharpenable tip that maintains accuracy through multiple re-grinds.
• Steam-tempered finish (steam oxide) for reduced friction and a tendency for workpiece material to resist sticking to the cutting edge.
• Long-series drill with straight shank—built for compatibility with a wide range of chucks and drilling setups, from handheld drills to stationary machines.
• High-speed steel (HSS) material chosen for versatile performance across common engineering materials, enabling reliable drilling in steel, aluminum, and stainless steel.
• Designed for 6×D drilling without pecking in steel, making it a practical choice for tasks requiring deeper holes without frequent tool changes.

Who this is for: fabricators, mechanical engineers, maintenance technicians, and workshop operators who routinely drill deep holes or need extended reach without sacrificing hole quality. The A110 21 mm drill is equally at home in hand-held drilling setups or mounted CNC/machine environments, delivering consistent performance across a range of materials.

Why it matters in real-world work

• Consistent hole quality from start to finish thanks to the 118° point that penetrates smoothly and reduces wandering in tough metals.
• Extended reach reduces tool changes in multi-pass or entrenched workpieces, saving time on production runs and maintenance tasks.
• Steam oxide finish minimizes material buildup on the cutting edge, helping maintain cutting efficiency and reducing chip adhesion during longer drilling sessions.
• Versatility across common metals means you can standardize on a single drill line for multiple applications, simplifying inventory and tooling decisions.