Dormer Pramet A125 6.50 mm x 250 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 6.50 mm x 250 mm HSS straight shank extra-long drill — a purpose-built tool for serious hole-making where reach and reliability matter. This is an extra-long series drill designed to tackle deep or hard-to-reach holes with precision and control, all in a single pass when conditions permit. The drill combines a robust 118° conventional point with a steam oxide finish to optimize cutting performance and reduce sticking, so you can push deeper without sacrificing edge life.

Key specifications that matter on the shop floor

• Diameter x length: 6.50 mm diameter, 250 mm overall length — ideal for drilling long through-holes or pockets where shorter drills can’t reach. (BS 328 compliant, straight shank)
• Shank type: Straight cylindrical shank for solid guidance and compatibility with a wide range of drilling machines.
• Point geometry: 118° conventional point — strong, easy to re-sharpen, and forgiving when starting holes in tough metals.
• Material and finish: Premium high-speed steel (HSS) with a steam oxide/steam tempered finish to minimize workpiece sticking and enhance chip flow.
• Depth capability: Designed for deep drilling with recommended depths up to 10xD (without pecking) in steel, making it a reliable choice for long through-holes.
• Applications: Versatile across steel, aluminum, stainless steel, cast iron, and non-ferrous materials, on a variety of machines from manual to CNC setups.

Whether you’re fabricating framework, drilling into thick plates, or creating long through-holes in machine components, the A125’s combination of reach, rigidity, and edge retention helps you complete the task with fewer tool changes and cleaner holes.

Why this drill stands out

• Ultra-long reach without compromise: The extra-long geometry provides extended reach for deep cavities and pockets, keeping workholding simpler and reducing the need for multi-step drilling.
• Strong, grind-friendly tip: The 118° point stands up to tough starting conditions and is easy to re-ground, saving time on maintenance and allowing a fast return to cutting.
• Chip control and reduced stickiness: Steam oxide finish minimizes material adhesion at the cutting edge, promoting smoother chip evacuation and steadier feeds.
• Broad material compatibility: From steels to stainless steels and non-ferrous alloys, this drill is built to perform across common machining tasks without changing tools.
• BS 328 standard compliance: Engineered to meet established European standards for long, straight-shank drills, ensuring interchangeability and predictable performance.

In practice, this means fewer tool changes, more consistent hole quality, and less downtime between operations. The A125 series is a dependable choice when your project demands long holes with dependable performance from a single tool.

Practical tips for best results

• When drilling steel or stainless steel, maintain steady feeds and avoid aggressive plunging to maximize edge life and hole quality.
• Use proper work-holding and pilot the hole if you’re entering through a thick plate to keep the drill from wandering on start.
• Since the 10xD depth is a typical guideline for this series, plan for chip evacuation and breakthrough strategies to prevent overheating or binding in longer through-holes.
• Store in a dry environment to preserve the steam oxide finish and prevent corrosion on the shank.

Designed for shop floors that demand durability, reach, and versatility, the Dormer Pramet A125 6.50 mm x 250 mm HSS straight shank extra-long drill is a reliable partner for long-hole drilling projects across a range of materials and machines.