Dormer Pramet A125 3.00 mm x 160 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 3.00 mm x 160 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a precision-driven drill bit built to conquer deep-hole tasks with consistent accuracy. Designed for metalworking professionals and serious hobbyists alike, this extra-long drill enables you to reach where standard bits fail, delivering clean, true starts in challenging workpieces.

Key features that matter on the shop floor

• 118-degree conventional point: A robust, self-centering tip that starts cuts with authority and is easy to re-sharpen, helping you maintain accuracy over multiple holes.
• Steam oxide finish: An anti-adhesion coating that minimizes workpiece material sticking to the edge, reducing pull-out and prolonging tool life.
• Extra-long length (160 mm overall): Specifically chosen for drilling very deep holes and for applications where reach is critical, without compromising rigidity at the point of entry.
• Premium HSS material: High-speed steel blends durability and versatility, suitable for drilling steel, aluminium, and stainless steel — enabling a single drill to cover a broad range of projects.
• Straight shank: Compatible with a wide array of drill chucks and machines, delivering a straightforward, reliable grip and predictable runout for precise hole placement.
• BS 328 specification: Built to standard dimensions and performance expectations, ensuring consistent interchangeability with other tools in your workshop.

Why this extra-long drill stands out

Depth is the defining advantage here. When you’re drilling through thick materials or into recessed areas, standard-length drills struggle with chatter, wander, or incomplete holes. The A125 extra-long series provides a stable pilot and maintains true alignment as the cut progresses deeper, helping you achieve consistent hole diameters and clean finishes from top to bottom.

Ideal use scenarios

• Machining deep blind holes in steel or stainless steel for fasteners, bushings, or alloy components.
• Working on long workpieces where access to the rear face is restricted, such as automotive suspension arms or structural metalwork.
• Prototyping and fabrication tasks where a single bit must handle multiple materials, thanks to its versatile HSS construction.

Practical tips for optimum results

• Use cutting fluid or light oil to reduce heat buildup and extend edge life, especially when drilling stainless steel or other hard alloys.
• Feed slowly and steadily; pause to retract periodically on deep holes to clear chips and prevent clogging.
• Match spindle speed to material and diameter: smaller diameters like 3.00 mm benefit from cautious speeds to maintain a sharp edge.
• Resharpen the 118-degree point as needed to preserve clean starts and minimize wandering on entry.

Who should consider this drill?

It's an excellent choice for machinists, fabricators, and workshop enthusiasts who frequently encounter deep-hole drilling tasks in steel, aluminium, and stainless steel. If you need reliable reach without sacrificing accuracy or versatility, this Dormer Pramet A125 drill is designed to deliver.

Invest in a drill bit that combines precise geometry, durable material, and extended reach — so deeper holes, cleaner finishes, and fewer tool changes become part of your everyday workflow.