Engineered for reach and precision, the Dormer Pramet A125 5.00 mm x 250 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built for challenging deep-hole tasks without compromising cut quality.

Key features deliver real-world results:

• 118° conventional point — a stout, self-centering tip that starts cleanly and is easy to re-grind when sharpening is needed, minimizing downtime.
• Steam oxide finish — improves chip evacuation and reduces tendency for workpiece material to stick to the cutting edge, keeping your drill cutting freely.
• Extra-long length (250 mm) — ideal for drilling very deep holes or reaching recessed features where shorter tools struggle, with straight shank for robust grip in collets and chucks.
• Premium HSS material — versatile across a wide range of materials including steel, aluminum, and stainless steel, delivering dependable wear resistance and long life.
• BS 328 specification — designed to meet standard dimensional and performance expectations for reliable, repeatable results in production environments.

This drill is a practical workhorse for machinists, fabricators, and maintenance technicians who routinely tackle deep-hole drilling, pocket hookups, or pass-through holes. Its straight shank ensures compatibility with standard drill chucks, while the A125 geometry provides a balanced combination of start-up bite and long tool life.

Practical guidelines to get the most from the A125 5.00 mm x 250 mm drill:

• Match speed and feed to your material: use slower speeds for stainless steel and hardened alloys, with adequate coolant to control heat.
• Pre-drill a pilot hole if starting in hard or brittle material to improve accuracy and reduce deflection.
• Keep the drill aligned with the workpiece to prevent off-centre wear; for deep holes, back-tab or peck drilling strategies help manage chips and heat.
• Sharpen when you notice slower cutting, increased noise, or smoke; regrinding a 118° point helps extend tool life.

In the box or on the machine, you’ll appreciate the control and consistency this drill provides across jobs that demand depth and reliability.