Dormer Pramet A125 13/32 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 13/32 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill — a purpose-built solution for deep-hole drilling in metalworking. Designed to reach into long bores with stability, this drill delivers dependable performance where standard bits fall short.

Why the A125 stands out

• 118° conventional point creates a strong, self-centering tip that starts easily and reduces wandering when entering through tough materials.
• Steam oxide finish minimizes friction and helps chips evacuate, so the cutting edge stays clear and the material doesn’t stick to the bit.
• Extra long length (310 mm) paired with a straight shank provides extended reach for deep holes and through-bores, reducing the need for adapters or extensions.
• Premium HSS material engineered for reliability across a range of metals, including steel, aluminum, and stainless steel, with good heat resistance during extended cuts.
• Re-sharpenable/long life the pointed tip is designed to be re-ground, extending the usable life of the drill for demanding work environments.
• BS 328 spec ensures compatibility with common industrial drilling setups, whether in a drill press, CNC machine, or handheld rig with a compatible chuck.

Ideal applications and scenarios

Perfect for jobs that require deep access in metal workpieces, such as drilling through long sections of steel tubing, automotive or aerospace components, engine blocks, or thick aluminum profiles. The A125’s long reach makes it a trusted companion for fabrication shops, maintenance teams, and machine operators tackling through-holes where standard-length bits can’t reach.

How this drill helps your workflow

• Precision with confidence: the 118° point minimizes wandering, helping you start true from the first cut.
• Cleaner cuts, less adhesion: the steam oxide finish reduces built-up edge, improving chip flow and cutting efficiency.
• Versatility in one tool: suitable for a variety of metals, enabling smoother setup across multiple projects without swapping bits.
• Long-term value: the combination of robust HSS and re-sharpenable geometry means fewer replacements and lower downtime.

Practical tips for best results

For optimal performance, pair the Dormer Pramet A125 with proper workholding and a stable drilling setup. Use cutting fluid or light lubrication on non-ferrous metals to reduce heat, and for steel or stainless, ensure adequate chip clearance to prevent clogging. Start with a conservative feed and allow the bit to do the work, increasing only as the cut clears. If you need to extend life further, schedule periodic regrinding to restore the original 118° geometry.

Dimensions at a glance: diameter 13/32 inch, overall length 310 mm, HSS with straight shank, Extra Long Series, BS 328 compliant.