Dormer Pramet A125 17/32 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 17/32 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is purpose‑built for serious metalworking where depth and reach matter as much as cutting performance. This long-reach drill bit combines a robust construction with precision geometry to tackle deep holes in a variety of metals with reliability you can feel in every cut.

Key advantages that matter in real-world drilling

• 118° conventional point delivers a strong, self‑centering starting edge that resists wandering and stays sharp longer when re‑grinding is needed.
• Steam oxide finish reduces friction and minimizes built‑up edge on the cutting face, helping to keep the hole clean and the drill cool during extended runs.
• Extra-long length – 310 mm and a straight shank provide exceptional reach for deep holes, challenging components, and hard‑to‑access work areas without compromising rigidity.
• Premium HSS material handles a broad range of metals—from steel and aluminum to stainless steel—making it a versatile choice for mixed‑materials projects.
• Straight shank design ensures straightforward clamping in standard drill chucks and collets, promoting stable cutting and minimal runout.
• BS 328 compatibility means dependable interchangeability with common machine tools and accessory ecosystems used in professional shops.

Ideal use cases

Use the A125 Extra Long drill when you must drill deep through thick workpieces, fixtures, or assemblies where shorter bits won’t reach. It excels in manufacturing, automotive components, fabrication jigs, and maintenance tasks that demand long drill reach without sacrificing hole quality or tool life. Whether you’re working with steel, aluminum, or stainless steel, this bit maintains a clean cutting action and dependable hole geometry from the first plunge to the final exit.

Practical tips for best results

• Match the drilling speed and feed to the workpiece material to minimize heat buildup; for tougher alloys, use conservative feeds and steady torque application.
• Maintain lubrication or a light cutting fluid to extend tool life, especially on stainless steel or high‑strength steels.
• Start with a light pilot hole if the workpiece is prone to wandering, then progress to the full 17/32 inch diameter to achieve the precise hole size efficiently.
• Inspect the edge after multiple re‑grinds; A125 bits are designed for repeated resharpening, but ensure the relief angles and edge geometry stay true for consistent performance.

Designed for machinists, fabricators, and serious DIYers who demand dependable reach and consistent hole quality in metal, the Dormer Pramet A125 drill bit is a trusted choice for deep drilling tasks. Its combination of an aggressive tip, protective finish, and long cutting length translates to fewer tool changes, smoother operation, and cleaner holes in demanding applications.