Meet the Dormer Pramet A940 6.60 mm HSS-E high-performance multi-application straight shank long series drill (DIN/ANSI). This precision drill bit is built for reliability in diverse metalworking tasks, delivering consistent hole quality from the first cut to the last. With its robust HSS-E substrate, it handles steel, aluminum, and stainless steel with confidence, making it a versatile workhorse in any machine shop or fabrication environment.

Key design advantages that drive real-world results

• 130° point for self-centering — minimizes wandering at entry and reduces push force, helping you achieve accurate starts and clean holes with less operator effort.
• Bright, anti-adhesion finish — discourages workpiece material from sticking to the cutting edge, promoting smoother penetration and longer tool life in tough alloys.
• Parabolic flute design — engineered to drill extra-deep holes in a single pass, boosting productivity by reducing rework and depth-limited tasks.
• Premium HSS-E material — optimized for efficient drilling across a broad range of metals, including steel, aluminum, and stainless steel, while maintaining dimensional accuracy.
• Long series, straight shank — delivers a stable, rigid reach with DIN/ANSI compatibility, ensuring reliable toolholding and consistent performance in deep-hole applications.
• High-precision tolerancing (h10) — supports high-quality hole dimensions even at higher speeds and feeds, reducing downstream finishing needs.

Who benefits most

• Shop technicians and machinists performing routine and deep-hole drilling in mixed metals.
• Fabrication houses requiring a single, dependable drill bit that covers multiple materials without changing tools.
• Engineering teams that value repeatable results, tight hole tolerances, and efficient production cycles.

Practical usage tips

• Match your speed and feed to the material and thickness; start with a moderate RPM and gradually increase to find the balance between chip formation and surface finish.
• Maintain steady workpiece clamping and a consistent drilling force to leverage the 130° point’s self-centering capability.
• Use appropriate coolant or lubrication to reduce heat buildup, especially when drilling stainless steel or harder alloys.
• For deeper holes, rely on the parabolic flute’s geometry to minimize chatter and ensure straightness throughout the cut.

When you choose the Dormer Pramet A940 6.60 mm HSS-E high-performance multi-application straight shank long series drill, you’re selecting a tool designed to excel under real-world manufacturing pressures—combining versatile material compatibility, reliable hole quality, and a geometry tuned for efficiency. It’s a smart, durable choice for shops that value precision without sacrificing productivity.