Dormer Pramet A125 4.50 mm x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 4.50 mm x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built for those deep-hole challenges where reach and reliability matter as much as cutting speed. This drill combines a precise geometry with robust construction to deliver consistent results in a range of metals.

118° conventional point for clean starts — The classic point angle provides a strong, self-centering tip that resists wandering, even when you’re starting holes in tougher workpieces. It’s also designed to be easy to re-sharpen, helping you extend tool life without sacrificing accuracy.

Steam oxide finish reduces sticking — The coated cutting edge minimizes built-up material on the flute, promoting smoother chip flow and helping maintain hole quality in stainless steel, mild steel, and alloys. This finish also contributes to easier maintenance between jobs.

Extra-long reach for deep holes — At 310 mm overall length, this drill reaches into thick sections, through long pockets, or into assemblies where standard drills can’t access. The straight shank ensures solid clamping in standard chucks and collets, delivering predictable runout and steadier drilling in handheld or CNC setups.

Premium HSS for versatile metalworking — Crafted from high-speed steel, this drill handles a broad spectrum of materials—from steel and aluminum to stainless steel—with reliable edge retention and solid heat resistance. It’s designed to perform consistently across common fabrication tasks, reducing tool changes and downtime.

BS 328 standard and practical design — The A125 4.50 mm x 310 mm drill is specified to meet reliable sizing guidelines, making it a dependable choice for workshop inventories and production environments where interchangeability with compatible tooling matters.

Ideal for automotive fabrication, machine shops, mold making, and general metalworking, this drill is ready for long-running drilling sessions where depth and precision must coexist with durability. Use it in benchtop drill presses, milling machines, or CNC centers to tackle deep bores with confidence.