The Dormer Pramet A940 1/4 Inch HSS-E High Performance Mult-Option Straight Shank Long Series Drill is engineered for precision, durability, and versatility across a wide range of materials. Built for professional shops and demanding fabrication tasks, this long-series drill delivers consistent, high-quality holes with fewer tool changes and minimized downtime.

• 130° point for self-centering and lower push force – designed to locate accurately and reduce workpiece wander, helping you start every hole cleanly and confidently.
• Bright finish to minimize chip adhesion – a smooth cutting edge bite that resists material buildup, keeping cutting performance steady over long runs.
• Parabolic flute design for deep-hole drilling in one pass – optimized chip evacuation and load distribution allow drilling notably deeper holes without pecking, improving cycle times on demanding jobs.
• Premium HSS-E (5% cobalt) material – combines high hardness and toughness, suitable for steel, stainless steel, and other challenging alloys, while maintaining resilience under high-speed conditions.
• Long-series, straight shank (DIN/ANSI compatible) – engineered for compatibility with standard drill collars and holders, providing extended reach without compromising rigidity.
• High performance with tight hole tolerance – designed to achieve high-quality, accurate holes even at elevated speeds and feeds, typically aligned with H10 tolerance targets for precision work.

Who should consider the A940 Long Series? machinists, job shops, and manufacturers who routinely drill through tough metals or require deeper holes in a single pass will appreciate the combo of depth capability and stability. It’s especially well-suited for steel, stainless steel, and aluminum applications where consistent hole quality matters and cycle times are critical.

Use cases range from fixture plate work and drilling through thick sections to creating deep pockets or blind holes where access is limited. The combination of 130° point, bright finish, and parabolic flute design translates to smoother starts, better chip removal, and longer tool life under high-speed machining conditions. When selecting feeds and speeds, follow material-specific charts and maintain appropriate clamping to minimize deflection and maximize the benefits of the long-series geometry.

In practice, this drill shines in environments that demand repeatable performance across multiple materials while maintaining DIN/ANSI compatibility and standard shank interfacing. It’s a reliable choice for professionals who value depth capability, precision, and a tool that stays productive over long production runs.