Dormer Pramet A125 9/64" x 310 mm HSS Straight Shank Extra Long Drill BS 328 is engineered to conquer deep-hole drilling with dependable performance in a range of metals. This straight-shank drill bit from Dormer Pramet blends classic geometry with modern heat- and wear-resistant construction, delivering precise, repeatable results for professional shop floors and fabrication environments.

Key features that matter in real-world work

• 118-degree conventional point provides a strong, self-centering bite that makes initial penetration smooth and predictable, while preserving edge geometry for easy re-grinding when needed.
• Steam oxide finish helps reduce sticking between the cutting edge and workpiece material, aiding chip flow and reducing heat buildup during longer drilling sessions.
• Extra-long length (310 mm) is purpose-built for drilling very deep holes and accessing hard-to-reach sections, minimizing the need for extensions or awkward setups.
• Premium HSS material offers solid performance across a variety of metals—steel, aluminum, and stainless steel—while maintaining toughness and wear resistance under demanding cutting conditions.
• Straight shank design ensures reliable clamping and compatibility with a wide range of drill chucks and holders, delivering steady guidance and reduced runout.

Practical use and applications

• Ideal for deep-hole drilling in automotive components, machine frames, and structural steel work where access is limited and reach matters.
• Excellent for preparing through-holes in aluminum enclosures or stainless-steel assemblies where clean edges and consistent diameters are critical.
• Suitable for fabrication and maintenance tasks that demand extended reach without sacrificing hole quality or tool life.

Tips for best results

• Use appropriate spindle speed and a steady feed rate to maximize the 118° point’s performance and prolong edge life; consult your machine’s guidelines for the recommended range on 9/64" drills.
• Maintain adequate chip clearance; the steam oxide finish helps, but clear chips regularly to prevent re-cutting and overheating.
• Consider light coolant or cutting fluid for stainless steel or higher-strength alloys to reduce friction and extend tool life.
• Resharpen when you notice a drop in bite or cutting efficiency—this 118° point is designed for easy re-grinding to extend the tool’s usable life.

With its combination of deep-reach capability, robust HSS composition, and a geometry that respects both cutting efficiency and re-sharpening practicality, the Dormer Pramet A125 drill is a reliable choice for professionals who routinely tackle challenging bore depths. Rely on this drill when precision, reach, and versatility are non-negotiable.