Meet the Dormer Pramet A940 10.20 mm HSS-E High Perf Multi-App Straight Shank Long Series Drill (DIN/ANSI). This is a purpose-built, multi-material drilling solution designed for engineers and machinists who demand field-tested reliability, precise hole quality, and depth versatility in a single pass.

• 130° point for self-centering starts and reduced push force, helping you maintain control at lower feed pressures and achieve cleaner entry into tough materials.
• Bright finish that minimizes adhesion between workpiece material and the cutting edge, promoting smoother chip flow and less recutting for better hole finish.
• Parabolic flute design engineered to evacuate chips efficiently, enabling deeper holes in one pass and reducing the risk of clogging when drilling long, through-holes.
• Premium HSS-E material (high-speed steel with enhanced cobalt content) optimized for drilling a wide range of materials—from steel and stainless steel to aluminum—while delivering extended tool life in demanding settings.
• Long series with straight shank for robust seating and stability on DIN/ANSI drilling machines, ensuring consistent alignment and minimized run-out during high-speed operations. The drill maintains h10 hole tolerance for high-precision results.

This drill is ideal for fabrication shops, maintenance teams, and job sites where you need a single tool that can handle multiple tasks—from steel fabrication and aluminum fabrication to stainless steel work—without swapping bits. The A940’s design targets high-speed, high-feed applications while preserving hole quality, allowing you to push the limits of depth and accuracy in one steady pass.

Key use cases include: - Through-holes in structural steel and aluminum components where depth exceeds typical hole lengths. - Precision pilot and initial drilling in stainless steel where entry reliability matters. - Multi-material assemblies requiring consistent hole geometry across different workpieces without changing tools.

Compared to standard multi-purpose drills, the A940 emphasizes a balance of aggressive drilling geometry and controlled chip evacuation to reduce heat buildup and extend tool life at elevated speeds. Its cobalt-enhanced HSS-E composition stands up to repeated cycles in demanding materials, helping you maintain tight tolerances and reproducible results across batches.

Practical tips for best results: - Match spindle speed and feed rate to material type to minimize heat and maximize edge life. - Use light threading and gradual pecking when drilling stainless steel to prevent workpiece work hardening. - Rely on the parabolic flute for long through-holes, but pause briefly to evacuate chips on very deep holes to prevent clogging. - Ensure proper clamping to keep the long-series drill perfectly aligned for accurate hole geometry.