Meet the Dormer Pramet A978 4.50 mm HSS-E High Performance Multi-Application Straight Shank Extra Long Series drill. Designed for precision, reliability, and reach, this DIN 1869 drill is built to handle demanding deep-hole tasks without compromise.

Key features and why they matter

• 130-degree point – A self-centering tip that starts holes cleanly and reduces the push force needed, helping you maintain accuracy even on tough or misaligned surfaces.
• Bright finish – A smooth cutting edge that minimizes friction with the workpiece, reducing material sticking and chip welding for smoother, more consistent drilling.
• Special parabolic flute design – Optimized chip evacuation for drilling very deep holes in a single pass, lowering heat buildup and extending drill life in long-reach applications.
• Premium HSS-E material – Enhanced wear resistance and durability, suitable for a broad range of materials including steel, aluminium, and stainless steel.
• Extra long length series – Specifically crafted for applications requiring increased reach, enabling you to access deep cavities, flanges, or through-holes without changing tools.
• Straight shank, DIN 1869 – Compatible with standard collets and chucks for stable, true drilling with minimal runout.

The Dormer Pramet A978 4.50 mm drill is your go-to solution when deep-hole accuracy matters. Its multi-application design means one drill handles a variety of materials, reducing tool changes and keeping you productive across different projects—from everyday metal fabrication to more specialized equipment maintenance.

Ideal use cases

• Deep-hole drilling in steel components, where straightness and hole concentricity are critical.
• Through-holes in aluminium parts that require a clean entry and reliable chip removal.
• Stainless steel assemblies where heat generation must be controlled and edge wear minimized.
• Maintenance and repair workflows needing extended reach without swapping to multiple shorter drills.

Practical tips for best results

• Match speed and feed to material type and depth; for deep holes, moderate speeds with generous coolant/ lubrication help sustain the parabolic flute performance.
• Use a sharp pilot or center marking to leverage the 130-degree point for a fast, accurate start.
• Keep the flute clear of chips during long drilling passes to prevent clogging and heat buildup.
• Check for proper clamping to minimize runout—straight shank drills rely on a solid grip to maintain hole accuracy over extended reach.

Choosing the Dormer Pramet A978 4.50 mm HSS-E High Performance Multi-Application Straight Shank Extra Long Series drill means selecting a versatile, durable tool designed to deliver precise, deep-hole results across common engineering materials. If you’re tackling deep bores, this DIN 1869 drill provides the reach, reliability, and performance you demand from a single, high-quality instrument.