Dormer Pramet A125 1/8 Inch x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 1/8 Inch x 200 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a purpose-built solution for deep-hole drilling in metalworking. This is the tool you reach for when reach, precision, and reliability matter in every pass.

• Diameter and length: 1/8 in (0.1252"), with a 200 mm overall length designed for long reach in tight or hard-to-access workpieces.
• Tip geometry: 118° conventional point that provides a strong, self-centering tip and remains easy to re-sharpen for extended tool life.
• Material and finish: Premium high-speed steel (HSS) with a steam-oxide (steam tempered) finish to reduce friction, minimize built-up edge, and extend cutting life across steel, stainless, and aluminum.
• Shank design: Straight shank for broad compatibility with most drill chucks and end-user machines, delivering stable alignment and minimal runout in a variety of setups.
• Extra-long series: Specifically engineered for drilling very deep holes or when extra reach is required, allowing you to complete challenging tasks in fewer setups.
• BS 328 compliance: Manufactured to BS 328 standards, ensuring consistent geometry, concentricity, and performance across batches.
• Depth capability: The A125 series is optimized for deep-drilling applications, often described as 10xD drilling potential in single-pass operations without pecking in suitable materials.

Where this drill shines: precision deep-hole work in steel, aluminum, and stainless steel where standard-length bits fall short. It’s ideal for fabrication, automotive components, machinery housings, and any project that demands a long-reach drill bit with predictable performance. The 1/8" diameter is a common starting point for pilot holes or finishing operations in thin to medium-thickness workpieces, and the extra length minimizes the need for multiple setups.

Why choose this Dormer Pramet drill over general-purpose bits? The combination of a robust HSS core, steam-oxide finish, and an extra-long form factor delivers consistent hole quality in challenging depths, reduces wandering on entry, and improves chip evacuation in longer flute configurations. When you’re working with close-clearance environments or thick parts, this bit’s reach and reliability become a tangible productivity boost.

For best results, pair with appropriate drilling speeds and lubrication suited to the material. Start with a clean pilot if drilling in difficult alloys, maintain steady feeds to prevent overheating, and re-sharpen as needed to maintain the 118° tip geometry. This is your go-to drill for deep-hole tasks where accuracy, reach, and durability truly matter.