Dormer Pramet A125 11.00 mm x 250 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Reach deeper with precision and consistency using the Dormer Pramet A125 11.00 mm x 250 mm HSS straight shank extra long drill (BS 328).

This extra-long drill is designed for demanding deep-hole work where standard bits fall short. Built around premium HSS material, it delivers reliable performance across a range of materials while maintaining a clean, accurate entry and exit. The 118-degree conventional point provides a strong, self-centering start that resists wandering and minimizes start-up chatter, helping you maintain hole location and straightness from the first cut.

• 11.00 mm diameter, 250 mm length in a straight-shank form for compatibility with standard drill chucks and machines.
• 118° point offers a robust cutting edge that’s easy to re-sharpen, delivering fast cuts with reduced deflection in tough materials.
• Steam oxide finish reduces built-up edge and prevents workpiece material from sticking to the cutting edge, promoting smoother chip flow and cleaner holes.
• Extra Long Series engineered for drilling very deep holes and applications where extended reach is essential—great for through-holes, long pockets, or components with recessed features.
• Premium HSS material capable of drilling a wide range of materials, including steel, aluminium, and stainless steel, while resisting heat and wear during extended drilling sessions.
• BS 328 compliance ensures compatibility with common British Standards specifications, making it a dependable choice for professional shops and maintenance teams.

Who benefits most from this drill? machinists, fabricators, and maintenance engineers who routinely need to reach into tight spaces or through longer assemblies. It shines in automotive fixtures, aerospace components, and general metalworking where hole depth and accuracy matter as much as the cut itself. When you need one drill to handle deep holes without swapping tools, the A125 extra-long drill is a proven workhorse that maintains hole geometry and diameter consistency from start to finish.

Practical tips for best results: match the speed and feed to the material, use a peck drilling technique to clear chips, and periodically retract the bit to allow cooling and chip evacuation. Support the workpiece securely to minimize deflection, and re-sharpen as needed to preserve the 118° point geometry for repeated accuracy.