The Dormer Pramet A125 14.00 mm x 310 mm HSS ST Straight Shank Extra Long Series Drill (BS 328) is a purpose-built deep-hole solution for serious metalworking. With a 14.00 mm diameter and an overall length of 310 mm, this extra-long drill is engineered for reach where standard drills fall short, delivering consistent performance across demanding applications.

• 118° conventional point delivers a strong starting bite that minimizes wandering and tracks true through the workpiece. The design also rides well to retain sharpness, making it easier to re-grind when needed so you can extend the life of the tool.
• Steam oxide finish reduces friction and helps prevent workpiece material from sticking to the cutting edge, resulting in cleaner holes and fewer re-cuts.
• Extra-long length series is purpose-built for drilling very deep holes or situations where extended reach is essential—ideal for long workpieces, internal bores, or components with challenging access.
• Premium HSS material (high-speed steel) provides reliable cutting performance across a variety of materials, including steel, aluminium, and stainless steel, making it a versatile addition to any workshop or production line.
• Versatile usage—this drill shines in multiple setups, from manual drill presses to CNC machines, delivering consistent hole quality in diverse fabrication tasks.

Why choose this drill for your toolkit? The A125’s combination of a robust 118° point, low-friction steam oxide finish, and extended reach directly translates to deeper, cleaner holes with fewer tool changes. It’s especially well-suited for engineers, machinists, and hobbyists who routinely tackle long bores or workpieces that demand precision over extended depths.

Practical tips for best results: start with a clean pilot hole, use appropriate cutting fluid to extend tool life with stainless or high-strength alloys, and set conservative feed rates while preserving the drill’s edge geometry. When finishing a bore, withdraw the bit periodically to clear chips and prevent overheating, then re-sharpen as needed to preserve performance on future jobs.

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