Meet the Dormer Pramet A978 10.00 mm HSS-E High Performance Multi-App Straight Shank Extra Long Series drill. Built for reliability in demanding drilling tasks, this drill is designed to deliver precise holes with consistent performance across a range of materials. Its 10.00 mm diameter and extra-long reach make it a versatile choice for engineers, workshop technicians, and fabricators who need one tool that can tackle deep-hole work without swapping bits.

Key features and why they matter

• 130-degree point for self-centering action that starts holes with minimal wandering, reducing push force and improving hole location accuracy—especially important when starting deep wells or working with tight tolerances.
• Bright finish helps keep the cutting edge free from built-up material, minimizing friction and preventing workpiece material from sticking to the tip during extended drilling runs.
• Special parabolic flute design engineered to evacuate chips efficiently, enabling extra-deep holes in a single pass and reducing the need for repositions or multiple drilling passes.
• Premium HSS-E material delivers robust performance across a broad material spectrum—steel, aluminum, and stainless steel—while offering improved heat resistance and longer tool life under demanding cutting conditions.
• Extra long length series specifically developed for deep-hole drilling and applications where reach matters, giving you the flexibility to access hard-to-reach areas without compromising rigidity.
• DIN 1869 / 3 compliant design ensures compatibility with standard tool holders and drilling setups, making integration into existing workflows seamless.

Who benefits most

• Machinists and toolmakers performing deep-hole drilling in automotive, aerospace, and industrial manufacturing contexts.
• Fabrication shops needing a reliable, one-bit solution for through-holes and blind holes where depth and precision are critical.
• R&D and prototype environments where versatility and consistent performance across materials are essential.

Practical tips for optimal results

• Choose appropriate spindle speed and feed rate for the material being drilled; start with conservative speeds and increase gradually to maintain a clean entry.
• Use steady lubrication or coolant to dissipate heat, preserve the bright cutting edge, and extend tool life during long drill cycles.
• Let the parabolic flute design do the work—avoid aggressive plunging; maintain a steady, controlled advance to maximize hole quality and minimize exit burrs.
• When drilling very deep holes, periodically retract the drill to break chip buildup and prevent clogging, ensuring a consistent hole diameter throughout.