Dormer Pramet A125 7.00 mm x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Durable, precise, and built for deep-hole challenges — the Dormer Pramet A125 7.00 mm x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328 is a go-to choice for professional machinists. This 7.0 mm diameter drill bit is designed to tackle long, uninterrupted bores with reliability.

118-degree conventional point for precise entry — The A125 tip geometry provides a strong, self-centering bite that remains sharp through multiple sharpenings. The 118° angle is optimized for standard materials and common machining tasks, improving hole quality and reducing exit wander. When re-grinding, you can restore the point with minimal material loss, extending the life of the tool.

Steam oxide finish minimizes sticking and built-up edge — The surface treatment reduces workpiece material adhesion to the cutting edge, especially useful when drilling alloys and non-ferrous materials. That means cleaner holes, less chatter, and smoother chip evacuation in long holes.

Extra long length for maximum reach — This drill is part of the extra long series, specifically engineered for drilling very deep holes or accessing recesses where standard drills just won’t reach. The extended flute length maintains a balanced cut and helps dissipate heat during prolonged drilling, giving you consistent hole dimensions from top to bottom.

Premium HSS material for versatile performance — Made from high-speed steel, this drill bit delivers dependable performance across a range of materials — steel, aluminum, stainless steel, and more. The tough core and optimized flute geometry offer good rigidity and efficient material removal, minimizing dwell time between holes.

Straight shank for broad compatibility — The straight shank design ensures reliable seating in a wide variety of chucks and collets, from benchtop drill presses to CNC milling machines. This reduces runout and helps maintain hole accuracy, especially in deep-hole drilling where precision matters most.

This Dormer Pramet A125 drill is ideal for professional shops and DIY enthusiasts who frequently drill long, deep holes in metal components, engine blocks, or fabrications. Whether you’re creating through-holes for fasteners, piping, or hydraulic passages, this bit delivers predictable, clean holes with every plunge.

Practical tips for best results

• Use an appropriate cutting speed and feed rate for the material being drilled; slower for tougher steels, slightly faster for aluminum with proper lubrication.
• Apply a light cutting fluid to reduce heat and extend tool life during deep-hole drilling.
• Keep chips clear with steady pecking routines to prevent clogging in deep bores.
• Regularly inspect the tip and re-sharpen when needed to maintain hole quality.
• Store in a dry, organized rack to prevent corrosion on the steam oxide finish.