Key features that matter in real-world drilling

• Diameter and length. 9.00 mm diameter with a 310 mm overall length, part of the extra-long series crafted for drilling very deep holes or reaching into recessed areas where standard bits can’t reach.
• 118° conventional point. A robust tip geometry that starts cleanly and minimizes wandering, making setup faster and more reliable, especially on tough materials.
• Steam oxide finish. The oxide coating reduces workpiece adhesion at the cutting edge, helping chips break free and cutting edges stay clearer over extended use.
• Premium HSS material. High-speed steel delivers versatility across a variety of metals, including steel, aluminium, and stainless steel, so you can tackle mixed-material projects with one drill.
• Straight shank design. A straightforward, compatible fit with standard drill chucks and machines, ensuring dependable grip and predictable deflection characteristics during deep drilling.
• BS 328 designation. This drill is aligned with established sizing conventions, supporting consistent interchangeability in professional shops.

Why choose this drill for deep-hole tasks? When your project requires long reach without sacrificing rigidity, the A125’s extra-long geometry minimizes the need for multiple setups or re-fixturing. It’s ideal for deep bores, through-holes in thicker workpieces, and any application where access is restricted but precision still matters.

Materials and use cases

• Steel and alloyed steels: steady performance with reliable chip control, even through longer drilling passes.
• Aluminium: the 118° point aids a clean start and reduces walking when starting holes in softer metals.
• Stainless steel: versatile enough to handle mixed-material components typical in fabrication and maintenance tasks.
• Industrial and workshop settings: automotive, machinery maintenance, fabricating jigs, and fixture work where hole depth and reach are critical.

Practical tips for best results

• Clamp the workpiece securely and align the drill axis precisely to prevent deflection during deeper passes.
• Start with a light feed to establish the hole and gradually increase as you break through surface material.
• Withdraw the drill periodically to clear chips and reduce heat buildup, especially on longer holes.
• Use appropriate lubrication where recommended to extend tool life and improve surface finish on tougher metals.

For professionals and serious hobbyists who demand an all-in-one drill for deep drilling, the Dormer Pramet A125 9.00 mm x 310 mm HSS Straight Shank Extra Long Series Drill BS 328 delivers stability, reach, and dependable performance across common metals. Add it to your tool kit for when ordinary length drills just won’t cut it.