Dormer Pramet A125 4.50 mm x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Engineered for depth without compromise, the Dormer Pramet A125 4.50 mm x 200 mm HSS straight shank extra long series drill (BS 328) is built for serious drilling tasks. Its long reach and robust construction make it a reliable choice when you need to bore deep holes in a single setup, from fabrication to maintenance and repair work.

Key features that matter in real-world drilling

• 118° conventional point provides a strong, self-centering tip that starts cuts quickly and maintains control, making it easy to re-grind for extended life.
• Steam oxide finish reduces friction and helps prevent workpiece material from sticking to the cutting edge, promoting smoother chip flow and cleaner holes.
• Extra Long length (200 mm) delivers exceptional reach for drilling very deep holes or reaching recessed areas without repositioning, ideal for thick workpieces or assembly applications.
• Premium HSS material offers reliable performance across a wide range of materials, including steel, aluminum, and stainless steel, while maintaining stability and hole quality.
• Straight shank ensures compatibility with a wide array of collets and chucks, delivering true alignment and reduced runout on demanding setups.
• BS 328 standard alignment means predictable length and fit within established machining practices, supporting consistent results across jobs.

Practical use cases

Choose the A125 drill when your project demands precision with distance. Ideal for:

• Deep-hole drilling in structural steel, automotive frames, and heavy fabrications where access is limited.
• Long-reach holes in equipment housings, jigs, and fixtures where shorter drills can’t reach.
• General-purpose drilling in aluminum and mild steel where a durable, regrindable tip extends tool life.

Why this drill stands out from the rest

Many drills struggle with hole quality when reach is the priority. The Dormer Pramet A125 pairs a dependable 118° point with an extra-long 200 mm length, delivering clean starts, reduced wandering, and consistent hole geometry—even in challenging materials. The steam oxide finish minimizes sticking and heat buildup, while the straight shank guarantees stable, accurate cutting in a variety of machines and setups.

Tips for best results

• Match speed and feed to the material—slower feeds on harder steels and higher speeds on softer aluminum, with adequate lubrication to extend life.
• Use a light break-in pass on new drills to establish a true cutting edge before full-depth drilling.
• Maintain proper pecking cycles when drilling deep holes to clear chips and prevent binding.
• Inspect the tip and flute integrity after extended use; regrind only when the point remains true to keep hole accuracy consistent.