Dormer Pramet A125 7/16 Inch x 400 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 7/16 Inch x 400 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built for precision deep-hole drilling where reach and reliability matter. Designed for long, uninterrupted holes, this drill blends a robust carbide-friendly geometry with a durable High-Speed Steel core to deliver consistent performance through a range of materials.

• 118-degree conventional point provides a strong start and clean penetration, plus it’s easy to re-grind for extended life between sharpenings.
• Steam oxide finish helps prevent workpiece material from sticking to the cutting edge, improving chip flow and reducing built-up edge during tough drilling tasks.
• Extra-long length (400 mm) unlocks access to deep cavities, thick workpieces, or long-axis drilling where standard bits won’t reach.
• Premium HSS (High-Speed Steel) composition delivers reliable performance across a variety of metals—including steel, aluminium, and stainless steel—while maintaining edge retention under demanding speeds.
• Straight shank (ST) design ensures broad compatibility with common drill chucks and collets, making setup quick and predictable on a wide range of machines.
• BS 328 specification aligns this drill with standard sizing for straightforward selection in professional shops and fabrication environments.

Ideal for workshops, machine shops, and fabrication labs, this drill is particularly well-suited to tasks where long reach is non-negotiable—from drilling through long workpieces and thick walls to creating through-holes in automotive frames and structural components. The A125 excels in repetitive jobs where a dependable, re-grindable tip and a temperature-stable finish keep productivity high and downtime low.

Why choose the Dormer Pramet A125 over other long-series drills? It pairs a proven point geometry with a durable HSS core and a finish designed to minimize sticking, ensuring smoother chip evacuation and fewer interruptions. The extra-long length reduces the need for tool extensions or multiple setups, helping you complete projects faster with fewer tool changes and greater accuracy.

Whether you’re upgrading your drill bit arsenal for deeper operations or tackling a specific long-hole project, the Dormer Pramet A125 delivers the reach, rigidity, and reliability you rely on in professional metalworking. Pair it with proper feeds and speeds for your material to maximize life and performance, and you’ll notice fewer re-threads, cleaner holes, and improved assembly results.