Dormer Pramet A125 10.50 mm x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 10.50 mm x 310 mm HSS straight shank extra long drill—designed for serious deep-hole work where reach, precision, and reliability matter. This is the single-tool solution that lets you drill long through-holes without swapping to multiple bits or sacrificing alignment.

The A125 geometry delivers a robust 118° conventional point, creating a strong cutting edge that’s easy to re‑grind in the workshop. Paired with a steam oxide finish, this drill minimizes material buildup on the cutting edge, reducing sticking and ensuring smoother, faster starts—even in tough metals.

With an extra-long 310 mm length, this drill is purpose-built for applications that demand depth. It provides amplified reach for tall workpieces, thick sections, or enclosures, making it ideal for deep holes in steel, aluminum, and stainless steel without compromising rigidity or hole quality.

Constructed from premium HSS, the drill offers broad material compatibility and dependable performance across common metals encountered in fabrication, maintenance, and manufacturing environments. The straight shank ensures straightforward, secure mounting in standard chucks and machines, delivering stable, true holes even on extended drillings.

• Diameter: 10.50 mm; Overall length: 310 mm
• 118° conventional point for strong cutting and easy re-grinding
• Steam oxide finish to reduce sticking and extend tool life
• Extra long length for drilling very deep holes and increased reach
• Premium HSS suitable for steel, aluminium, and stainless steel
• Straight shank for wide compatibility and stable performance
• BS 328 series, ensuring precise sizing and geometry

Ideal for machinists, fabricators, and workshop technicians who need a dependable, extended-reach drill that handles a variety of metals in challenging setups. Use this drill for deep pocket drilling, long through-holes in frames and housings, or any scenario where conventional-length bits fall short.

Tips for best results: secure the workpiece firmly, use light cutting fluid or coolant, and maintain a steady feed to prevent deflection. For deep holes, employ gentle pecking cycles to clear chips and maintain cutting efficiency. When the edge dulls, re-sharpen promptly to preserve the 118° tip geometry and consistent hole quality.

Dormer Pramet A125—precision, depth, and durability built into a single, extended-reach drill.