Dormer Pramet A125 3.00 mm x 250 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 3.00 mm x 250 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built for engineers who need serious reach without sacrificing precision. This compact, robust drill is purpose-built for deep-hole work, delivering dependable starts and clean holes in a range of metals.

Key features that drive real results

• 118-degree conventional point — starts quickly and true, creating a strong, self-centering grind that’s easy to re-sharpen when needed.
• Steam oxide finish — reduces built-up edge and minimizes material sticking to the cutting edge, helping you maintain smooth hole quality over long runs.
• Extra long length (250 mm) — designed for drilling very deep holes and applications where extended reach is essential, while preserving rigidity and stability.
• Premium HSS material — versatile enough to drill a variety of metals, including steel, aluminum, and stainless steel, with consistent performance.
• Straight shank — compatible with standard drill chucks and collets, ensuring easy, secure mounting in machines or handheld setups.
• BS 328 specification — aligns with established metric standards for reliable interchangeability and straightforward stocking.

Why this drill stands out

Deep-hole drilling demands a blend of accuracy, rigidity, and tool life. The A125’s design focuses on those realities: a sturdy point that resists wandering, a finish that minimizes clogging, and an extended reach that opens up opportunities in fabrication, maintenance, and repair work. Whether you’re piercing through thick steel plates, fabricating housings, or creating through-holes in long components, this drill maintains a steady path from first contact to final exit.

Ideal use scenarios

• Deep-hole drilling in steel frameworks, automotive sections, and machinery bases
• Through-holes in thick workpieces where standard-length drills fall short
• Fabrication and repair tasks requiring reliable, long-reach drilling with a standard chuck
• Workflows that benefit from easy blade re-sharpening and consistent edge maintenance

Practical tips for best results

• Use appropriate lubrication or coolant to reduce heat and extend edge life during prolonged drilling.
• Secure the workpiece firmly to minimize vibration, especially when drilling deep holes.
• Match feed rate to material type—softer metals tolerate faster feeds, while harder alloys benefit from a controlled, steady approach.
• Keep the cutting edge clean and inspect the point regularly to preserve accuracy for long runs.