The Dormer Pramet A977 9.50 mm HSS-E High Performance Multi-App Straight Shank Extra Long Series drill is built for challenging, deep-hole work without compromise. Engineered to deliver precise starts, extended reach, and reliable performance across a range of materials, this drill elevates boring depth with every pass.

Why this drill stands out

• 130-degree point promotes self-centering and lowers the push force needed to begin cutting, helping you start holes cleanly and accurately.
• Bright finish minimizes material sticking to the cutting edge, reducing chip adhesion and improving chip evacuation in tougher jobs.
• Special parabolic flute design (PFX) is optimized for drilling extra-deep holes in a single pass, delivering consistent chip removal and reduced deflection at depth.
• Premium HSS-E material provides dependable performance across a broad material spectrum, including steel, aluminum, and stainless steel, with enhanced heat tolerance for demanding applications.
• Extra Long length series is purpose-built for drilling very deep holes and for setups where extended reach is essential, helping you access hard-to-reach bores without swapping tools.
• Straight shank designed for stable binding in standard drill chucks and boring machines, compatible with DIN 1869/2 specifications for consistent seating and runout control.
• DIN 1869 / 2 compliance ensures compatibility with a wide range of machine tools used in industrial drilling and precision manufacturing.

Ideal use cases

• Deep-hole drilling in steel, stainless steel, cast iron, and non-ferrous materials where extended reach is required.
• Automotive, aerospace, and mold-making scenarios that demand reliable, long-reach drilling without multiple pecks.
• Applications requiring a clean start and steady cutting action in tight or recessed workpieces.

How it performs and why it matters

The combination of a 130-degree point, bright finish, and parabolic flutes translates to easier centering, smoother entry, and efficient chip evacuation when drilling deep holes. The HSS-E alloy provides balanced toughness and heat resistance, enabling consistent drilling through multiple materials—from harder steels to softer aluminum—without frequent tool changes. Its extra-long geometry minimizes tool changes and cycle times in production environments where reach and reliability are non-negotiable.

Practical tips for best results

• Clamping: Secure the workpiece firmly to minimize deflection during deep drilling.
• Coolant and lubrication: Use appropriate cutting fluid or mist to manage heat, especially on steel and stainless steels.
• Feed and speed: Start with conservative feeds to establish a clean cut, then adjust to maintain steady chip evacuation as depth increases.
• Debiasing approach: For maximum depth, consider a pilot hole to guide the drill and reduce wandering on initial engagement.