Dormer Pramet A125 3.50 mm x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 3.50 mm x 200 mm HSS ST Straight Shank Extra Long Series Drill BS 328—a purpose-built drill bit designed for precision, reach, and durability in demanding metalworking tasks. This is the single, long-reach tool you reach for when depth and accuracy matter, from shallow pockets to through-holes in thick materials.

Key features that matter in real-world drilling

• 3.50 mm diameter with 200 mm overall length and a straight shank for universal compatibility with a wide range of machines, including drill presses and CNC mills. The extra-long geometry minimizes the need for extensions or multiple tools when you’re working on recessed or deeply buried holes.
• 118-degree conventional point provides a strong, easy-to-reground cutting edge that starts cleanly and reduces wandering during entry, saving time on setup and improving hole accuracy.
• Steam oxide finish lowers friction and helps prevent workpiece material from sticking to the cutting edge, promoting smoother chip flow and reducing built-up edge during prolonged drilling sessions.
• Premium HSS material delivers reliable performance across a variety of metals, including steel, aluminum, and stainless steel, making this drill versatile enough for mixed-material projects.
• BS 328 compliant construction ensures consistent quality and compatibility with standard tooling ecosystems, so replacements and upgrades stay straightforward in busy workshops.

Who needs this drill bit

Ideal for machinists, fabricators, and educational labs that require a dependable, long-reach drill bit for deep holes. It shines in applications like building components with thick walls, machining automotive housings, or drilling through stacked metal plates where a shorter bit would struggle to reach.

Practical guidance for best results

• Pair with proper spindle speed and feed rate for the material you’re drilling; keep chips evacuating smoothly with adequate lubrication to extend tool life.
• Use in machines capable of stable, precise rotation to maximize the benefits of the extra-long reach and maintain hole concentricity.
• Resharpen when needed to preserve the 118-degree point geometry and extend overall tool life, ensuring consistent hole quality over multiple projects.