Dormer Pramet A940 10.50 mm HSS-E High Performance Multi-Application Drill

Engineered for metalworking versatility, the A940 straight-shank long-series drill delivers consistent, high-quality holes across a broad range of materials. With a carefully designed geometry and robust HSS‑E substrate, it’s built to perform in demanding production environments where precision and reliability matter.

Key features that matter in real-world drilling

• 130° point for self-centering – reduces wander at the start and lowers push force, helping you punch through tougher workpieces with confidence.
• Bright finish – minimizes built-up edge and material adherence to the cutting edge, promoting cleaner holes and less rework.
• Parabolic flute design – optimized chip evacuation for deep holes, enabling longer reach and fewer chip jams in a single pass.
• Premium HSS-E material – exceptional wear resistance and heat tolerance, suitable for drilling steel, aluminium, and stainless steel without frequent tool changes.
• Long-series, straight shank – enhanced rigidity and compatibility with standard DIN/ANSI tooling, making it a dependable choice for CNC and manual machines alike.
• High-performance with H10 hole tolerance – capable of delivering precise hole sizes at higher speeds and feeds, reducing secondary finishing work.

Materials and applications

This drill is designed for multi‑material versatility. Use it for quick, accurate holes in carbon steel, stainless steel, and aluminum components, as well as assemblies requiring deep or through‑holes. Its robust construction makes it well-suited for production runs in manufacturing, automotive, and general engineering environments where consistency and repeatability are essential.

Why this drill stands out vs alternatives

Where other drills compromise at depth or heat, the A940 maintains clean cutting edges and stable hole geometry even at higher speeds. The combination of the 130° point, parabolic flute, and HSS‑E substrate translates into fewer tool changes, less rework, and tighter tolerances (H10) across a variety of workpieces. The straight shank and long-series length provide predictable performance in both portable handheld drills and fixed tooling setups, making it a reliable all‑round choice for shops that value uptime and precision.

Practical tips for best results

• Match cutting speeds and feeds to the material being drilled; use flood coolant or light oil to manage heat when drilling stainless steel or aluminum alloys.
• Ensure the drill is properly seated in a true chuck or collet to maintain concentricity and reduce runout during deep holes.
• For deep holes, rely on the parabolic flute to aid chip clearance; avoid pushing the drill beyond its optimal depth in a single pass to minimize overheating.
• Use a pilot hole for very hard materials to kick-start accurate entry and reduce the risk of wandering.