Dormer Pramet A125 5/32 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 5/32" x 310 mm HSS ST Straight Shank Extra Long Series Drill (BS 328). Designed for deep-hole drilling with reliability, this tool combines an aggressive starting point, standout durability, and an extended reach that makes hard-to-access workpieces practical rather than prohibitive.

Engineered for precision and longevity, the A125 drill features an 118-degree conventional point that delivers a strong, self-centering bite. The geometry reduces wandering at entry and holds a clean, true hole exit. Best of all, the point is easy to re-sharpen, so your drill stays productive through repeated use.

The drill’s steam oxide finish minimizes friction and helps materials shed from the cutting edge. This means fewer built-up edges when you’re drilling ferrous metals, smoother chip flow, and less downtime spent cleaning and deburring. It’s a practical advantage in production or hobbyist tasks where efficiency matters.

With 310 mm overall length and a straight shank, this extra-long drill is tailor-made for deep holes, recessed features, and applications where extended reach is essential. Whether you’re drilling through thick sections of steel, fabricating in tight spaces, or working on multi-layer assemblies, the extra length helps you access the inner depths without compromising rigidity or precision.

The combination of premium HSS material and versatile design means you can tackle a wide range of materials—steel, stainless steel, and aluminium—without swapping tools. The HSS core provides durability for repeated drilling cycles while maintaining a sharp edge for clean holes and good straightness in the cut.

Who should consider this drill? It’s ideal for metalworkers, machinists, technicians, and shop professionals who frequently drill deep holes or access hard-to-reach areas. It also suits maintenance teams and DIY enthusiasts tackling automotive, fabrication, or construction projects where a reliable, long-reach drill bit makes the job faster and more accurate.

Compared to shorter drills or those with less robust point geometry, the A125 extra-long series offers improved hole consistency, less wandering at start, and the flexibility to complete deeper drilling tasks without changing tools mid-project. Use it with standard drill chucks and holders, paired with appropriate cutting speeds and feed rates to maximize life and performance.

For best results, pair this drill with proper lubrication and peck drilling techniques to manage heat and chip evacuation, especially when working with stainless steel or other tough materials. Regularly inspect the edge and re-sharpen as needed to maintain a true entry and clean hole diameter.