Dormer Pramet A125 5/64 Inch x 160 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 5/64" x 160 mm HSS Straight Shank Extra-Long Drill (BS 328) — a purpose-built solution for deep-hole metalwork. This drill bit combines a robust cutting edge with long-reach geometry to tackle holes that standard drills simply can’t reach, all while delivering dependable, repeatable results.

• 118-degree conventional point — a strong, easy-to-sharpen cutting edge that starts cleanly and stays stable through the cut, reducing wandering and improving hole accuracy.
• Steam oxide finish — a protective coating that minimizes built-up material at the edge, helping chips flow smoothly and keeping the cutting edge cooler during extended drills.
• Extra-long length (160 mm) — specifically designed for drilling very deep holes or accessing tight workpieces where standard-length bits can’t reach.
• Premium HSS material — versatile enough to drill a wide range of metals, including steel, aluminium, and stainless steel, while maintaining hardness and toughness under demanding conditions.
• Straight shank — compatible with a broad array of chucks and holders, delivering solid grip and true alignment for precise drilling.
• BS 328 specification — built to meet recognized standards for performance and reliability in professional machining environments.

This drill bit shines in scenarios where depth and reach matter most. Ideal for fabrication shops, maintenance departments, and hobbyists tackling automotive, machinery, or structural projects, it delivers consistent hole quality in a variety of materials without frequent tool changes. The A125’s design minimizes deflection and chatter in deep-hole applications, helping you maintain productive feeds and speeds with fewer interruptions.

Practical use tips:

• Securely clamp your workpiece and use a rigid drill setup to prevent deflection during deep drilling.
• Start with a light pilot drill if the hole is particularly depth-heavy or if locating is challenging.
• Use appropriate cutting fluid or light lubrication when drilling steel and stainless steel to prolong edge life and improve chip evacuation.
• Peck drilling in small increments to clear chips and reduce heat buildup; back off periodically to check the hole quality.

Note: The product is designed as a single, continuous tool for deep-hole or extended-reach drilling and should not be treated as a set of variants.