Dormer Pramet A125 11/32 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 11/32 Inch x 310 mm HSS Straight Shank Extra Long Series Drill BS 328—a purpose-built solution for deep-hole work and demanding fabrication tasks. Designed to blend precision with durability, this drill is built to perform where standard bits fall short.

• Diameter and reach — 11/32 inch (approximately 8.74 mm) in diameter, with a full 310 mm overall length and a straight shank to fit a wide range of drilling machines and chucks. Ideal for deep holes, bored pockets, and hard-to-reach workpieces.
• 118° conventional point — A robust tip geometry that starts cleanly and resists walking. The conventional point is easy to re-grind, supporting long-term accuracy and reuse in busy workshops.
• Steam oxide finish — A smart coating that helps reduce material adhesion to the cutting edge, limits built-up edge, and improves heat management for steadier cuts and cleaner holes.
• Premium HSS material — High-speed steel delivers dependable performance across a variety of materials, including steel, aluminum, and stainless steel, making it a versatile workhorse for mixed-material projects.
• Extra long series versatility — Specifically engineered for applications requiring extended reach. Whether drilling deep holes in metal panels, engine blocks, or long-channel workpieces, this drill maintains stability and straightness through the cut.
• BS 328 compliant tool — Built to meet standard specifications that ensure compatibility with common machine configurations and accessories, streamlining procurement and setup for your shop.

Why this drill stands out: it combines a proven point geometry with an extended profile and a finish designed to minimize chip sticking, all in a single, reliable HSS drill. The result is precise hole formation, fewer reworks, and longer usable life in metalworking environments—from fabrication shops to maintenance departments. It’s especially well-suited for deep hole drilling where a conventional bit would require multiple passes or a shorter length tool.

Ideal use scenarios — deep-hole drilling in steel or stainless workpieces, long-reach holes in automotive or aerospace components, and any project where tool length and rigidity matter. Pair with appropriate feeds and speeds, use cutting fluid to improve surface finish and life, and reseat the bit promptly after use to maintain accuracy for future jobs.