Dormer Pramet A125 6.00 mm x 250 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

For deep-hole drilling tasks that demand reach, precision, and dependable performance, the Dormer Pramet A125 6.00 mm x 250 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built to power through metal with consistent results. Designed for shops that value reliability in challenging bore work, this drill delivers a clean entry and controlled chip evacuation across materials.

Key features

• 118-degree conventional point ensures a strong, self-centering start and predictable chip formation. The edge is designed to be re-ground, extending service life without compromising geometry.
• Steam oxide finish reduces sticking and built-up edge, promoting smoother penetration and easier cleanup when working with steel, stainless steel, and aluminum.
• Extra-long length: 250 mm provides extended reach for deep bores, recessed workpieces, or components with limited access—all while maintaining stable guidance through the drill chuck.
• Premium HSS material offers versatile drilling capabilities across a range of metals, including mild steel, stainless steel, and aluminum alloys, with reliable wear resistance.
• Straight shank design ensures broad compatibility with most drill chucks and fixtures, simplifying setups in both automated machines and manual drills.
• BS 328 compliant and part of the Extra Long Series, making it a practical choice for professional fabrication, maintenance, and production environments that demand consistency.

Why this drill stands out

Most drill bits struggle when you need long-reach holes or complex workpiece geometry. The A125 extra-long drill combines a sturdy straight shank with a robust HSS core, delivering straight holes with minimal wandering—even in deeper bores. The 118-degree tip geometry pairs with the steam oxide finish to minimize friction and maximize chip clearance, so you experience less heat buildup and longer tool life in tough materials.

Use cases

Ideal for fabrication shops, automotive maintenance, machine building, and general maintenance tasks that require drilling deep holes in steel, stainless steel, and aluminum. Whether you’re threading into a metal plate, creating clearance holes in a boss, or reaching into a recessed cavity, this drill bit maintains hole size accuracy and clean edges across multiple passes.

Tips for best results

To get the most from the Dormer Pramet A125, pair it with proper lubrication when drilling harder metals, start with a light touch to establish a precise pilot, and increase feed gradually as the bit clears chips. For steel and stainless, avoid overheating by using moderate speeds and steady pressure, and routinely re-sharpen the tip to maintain the original 118-degree geometry for repeatable results.