Dormer Pramet A125 19/32 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

When you’re tackling deep-hole tasks or working on layouts that demand maximum reach, the Dormer Pramet A125 19/32 inch x 310 mm HSS straight shank drill delivers precision, versatility, and long-term reliability. This extra-long series drill is purpose-built for deep holes and challenging access points, without compromising cutting performance or workflow speed.

Why this drill stands out

• 118-degree conventional point for a strong, self-centering start that reduces wandering and produces cleaner holes. The point is easy to re-grind, so you can restore sharpness in-house and minimize downtime.
• Steam oxide finish minimizes material sticking to the cutting edge, promoting smoother penetration and extending tool life in a range of workpiece materials.
• Extra-long length in the series is specifically designed for drilling very deep holes or reaching into recessed areas where standard-length bits can’t reach.
• Premium HSS material — highly adaptable for drilling steel, aluminum, stainless steel, and other common metals with dependable performance and balanced toughness.
• Straight shank for broad compatibility with most chucks and collets, ensuring stable torque transfer and straightforward tool changeovers on a variety of machines.
• BS 328 designation signals a respected, standards-aligned build, giving you confidence in quality and interchangeability across compatible tooling ecosystems.

Detailed features and practical benefits

The A125 drill combines a robust HSS core with a geometry optimized for durable, precise drilling. The 0.59375 in (19/32 in) diameter paired with a 310 mm (approximately 12.2 in) overall length makes it a go-to choice when you need to maintain alignment over extended depths without sacrificing chip clearance or cut quality. The 118-degree point minimizes walking on initial entry, especially in tougher materials, while the ability to re-sharpen keeps this bit in service longer, reducing replacement costs.

Ideal use cases

• Deep-hole drilling in steel and non-ferrous metals where standard-length bits fall short.
• Applications requiring extended reach into cavities, pockets, or assemblies where access is limited.
• General-purpose drilling on machines with straight-shank chucks or collets that benefit from a dependable, non-tapered shank.
• Situations where you need a single drill bit capable of handling multiple materials without swapping tools.

How this drill compares to everyday options

Compared with standard-length drill bits, the extra-long series reduces the need for extensions or auxiliary setups, streamlining workflows on intricate projects. The steam oxide finish enhances performance where workpieces are prone to sticking, which can otherwise slow progress due to built-up material on the cutting edge. The combination of a strong 118° point and a re-sharpenable design provides a practical balance of initial bite, longevity, and repeatable hole quality across diverse materials.

Practical tips for best results

• Use appropriate cutting fluid or coolant to manage heat on deeper holes and to extend tool life.
• Start with a smaller pilot hole if you’re drilling into harder alloys to improve alignment and reduce feed resistance.
• Maintain steady, moderate feed rates to prevent deflection in deeper holes; let the bit do the cutting rather than forcing it.
• Regularly inspect the drill tip for wear and re-sharpen as needed to preserve hole accuracy and edge integrity.
• Pair with a compatible drill press, milling machine, or CNC setup that supports a straight-shank tool and can comfortably accommodate the 310 mm length.

Designed for professionals and serious hobbyists alike, this Dormer Pramet A125 drill is the reliable workhorse you reach for when depth, reach, and versatility matter most. Whether you’re fabricating components, repairing assemblies, or performing precision metalworking, this extra-long HSS straight-shank drill delivers consistent performance, clean exits, and long-term value from a trusted name in cutting tools.