Dormer Pramet A125 5.00 mm x 400 mm HSS Straight Shank Extra Long Series Drill BS 328 is engineered for deep-hole precision and dependable performance in a range of metals. Built around a high-speed steel core, this extra-long drill is the go-to choice when reach matters as much as cutting power.

Key features that deliver reliable results

• 118° conventional point provides a strong start and remains easy to re-sharpen in the workshop, helping you maintain accuracy and reduce drift during setup. This geometry supports clean entry into harder materials and predictable hole alignment.
• Steam oxide finish minimizes material adhesion at the cutting edge, promoting smoother chip flow and reducing built-up edge when drilling steel, aluminum, and stainless steel. The finish also contributes to wear resistance in demanding drilling tasks.
• Extra-long length for deep holes with an overall length of 400 mm and a flute length of 300 mm, designed specifically for applications where access is constrained or deep hole drilling is required. BS 328-compliant, this drill maintains rigidity and accuracy over long reach.
• Premium HSS material provides versatile performance across a range of common metals—including steel, aluminum, and stainless steel—without sacrificing edge durability or cutting speed. This makes the A125 series a reliable workhorse for fabrication, maintenance, and workshop environments.
• Straight shank for universal mounting compatibility with standard drill chucks and collets on manual and CNC machines, ensuring straightforward setup and repeatable results across gear benches and production lines.
• BS 328 compliance confirms the tool’s dimensional standards for consistent interchangeability in professional settings, so you can source confidently from trusted suppliers.

What this drill is ideal for

• Deep-hole drilling in steel structures, automotive components, machinery housings, and fabrication frames where a standard-length drill would fall short.
• Projects that require long reach without compromising straightness or chip evacuation, such as drilling through thick plates or stacked assemblies.
• General-purpose steel, aluminum, and stainless steel drilling on both manual drill presses and CNC machines, where a robust, grindable point and durable edge are advantageous.

Practical guidance to maximize performance

• For best results, keep feed rates conservative on deep holes and allow the 10xD drilling depth (where applicable) to proceed in a controlled, peck-free manner unless your material requires progressive pecking. This approach helps maintain edge life and hole accuracy. (10xD depth is a common guideline associated with this extra-long A125 series.)
• Because the A125.5x400 series is designed without through-coolant channels, plan your cooling strategy accordingly—apply coolant at the cutting zone to reduce heat and extend tool life, or rely on dry cutting where appropriate for your material and machine setup.
• Use a sharp, properly indexed regrinding routine to preserve the 118° point angle, ensuring consistent starts and reducing chatter on hard or uneven workpieces.

With the Dormer Pramet A125 5.00 mm x 400 mm HSS Straight Shank Extra Long Series Drill BS 328, you’re equipping your workshop with a trustworthy, long-reach tool that blends precise geometry, wear-resisting finish, and broad material compatibility for everyday metalworking challenges. Whether you’re tackling automotive components, structural steel work, or precision enclosures, this drill delivers depth, control, and repeatable performance—time after time.