Meet the Dormer Pramet A125 8.50 mm x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a purpose-built solution for precise, deep-hole drilling in metalworking tasks. Built for performance where reach matters, this drill combines a robust point geometry with a finish designed to keep the cut clean and consistent from start to finish.

• 118-degree conventional point — delivers a strong, self-centering start that minimizes wandering and makes the edge easy to re-grind for continued accuracy over time.
• Steam oxide finish — reduces friction and prevents workpiece material from sticking to the cutting edge, promoting smoother cuts and reduced heat buildup.
• Extra-long length series — specifically engineered for drilling very deep holes and for applications where maximum reach is required, without sacrificing rigidity.
• Premium HSS (High-Speed Steel) — versatile across materials such as steel, aluminium, and stainless steel, offering reliable performance in a range of metalworking projects.
• Straight shank design — ensures compatibility with a wide array of drill presses, milling machines, and CNC setups, delivering consistent feed and chatter-free operation.
• BS 328 compatibility — a proven standard that supports dependable interchangeability in professional shops and workshops.

Why choose this drill for deep-hole work? The A125’s combination of a durable HSS core and a geometry optimized for long reach means you can trust it to maintain cutting efficiency deeper into the hole, reducing the need for frequent tool changes. The 118-degree point helps you start cuts cleanly on metallic surfaces, while the steam oxide finish minimizes material adhesion, which is a common hurdle in continuous drilling sessions.

Ideal use cases

• Deep-hole drilling in steel, aluminium, and stainless steel components, including tool housings, frames, and structural brackets.
• Fabrication and maintenance tasks where access is limited and long stroke drilling is required.
• Machining setups that rely on stable feeds in drill presses, milling machines, or CNC centers.

Practical tips for best results

• Use a steady, controlled feed to prevent deflection in deep holes; peck drilling can help clear chips and prevent overheating.
• Maintain appropriate lubrication to extend tool life and improve the finish on stainless and harder alloys.
• Routinely regrind the point to preserve the 118-degree geometry for consistent starts and reduced chatter.

The Dormer Pramet A125 8.50 mm x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built for professionals who demand depth, reliability, and compatibility across a broad range of metalworking machines. When reach and precision matter, this drill delivers from first cut to last.