Meet the Dormer Pramet A977 10.00 mm HSS-E Extra Long Drill — a purpose-built tool for deep-hole metalwork, combining reach, precision, and reliability in a single, robust package. Engineered with a straight shank and multi-application versatility, this drill handles challenging depths across steel, aluminium, and stainless steel with consistent results.

• 130° point geometry: delivers a self-centering entry and reduces push force, helping you start cleanly and maintain accuracy, even in difficult starts.
• Bright finish: minimizes material sticking to the cutting edge and improves chip flow, contributing to smoother cuts and cooler operation.
• Parabolic flute design (PFX): engineered for drilling very deep holes in a single pass, with efficient chip evacuation to prevent clogging during long reaches.
• Premium HSS-E material: cobalt-enhanced high-speed steel delivers enhanced hardness and wear resistance, making it suitable for steel, aluminium, and stainless steel.
• Extra-long length with straight shank: extended reach for deep-hole drilling while maintaining compatibility with standard drill chucks and machine tooling.
• DIN 1869/2 compliant: designed to meet established European standards for consistent sizing and interchangeability with other DIN 1869/2 tools.

This drill is ideal for professionals in fabrication, automotive, aerospace, and general machining who regularly encounter deep cavity drilling or deep-hole work in mid-to-high-hardness metals. The A977 series is built to maintain stable hole geometries under demanding conditions, thanks to its robust combination of 130° point geometry, parabolic flutes, and cobalt-enriched HSS-E construction.

Practical tips for best results

• Use a steady, moderate feed and maintain consistent cutting speed to maximize tool life in deep-hole scenarios.
• When drilling steel or stainless steel, apply appropriate cutting fluid to reduce heat and extend drill life.
• Start with a pilot hole if possible and progress gradually to the full 10.00 mm diameter to minimize wandering.
• Let the parabolic flute design do the work—avoid aggressive pecking; allow chips to evacuate freely for deeper holes.