Dormer Pramet A125 5/32 Inch x 250 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A1255/32X250 – a purpose-built HSS drill designed for deep-hole work and tough metalworking tasks. With a straight shank and a precisely engineered tip, this drill delivers reliable performance in a compact, single-pass format that fits a wide range of machines and chucks.

Key features that matter in real-world drilling

• 118° conventional point – a strong, re-sharpenable tip that stays sharp longer and handles steel with confidence.
• Steam oxide finish – a steam-tempered coating that helps prevent workpiece material from sticking to the cutting edge, promoting smoother chip flow and cleaner hole starts.
• Extra-long length (10xD) – designed for drilling very deep holes or reaching into recessed areas where standard drills can’t reach.
• Premium HSS material – versatile enough for drilling steel, aluminum, stainless steel, and many other metals, delivering durability across applications.
• Straight shank – compatibility with a broad range of drill chucks and hand-held or machine setups.
• BS 328 standard as the reference for size and geometry, ensuring consistent fit and performance.
• Designed for deep-hole efficiency – in many cases, 10xD single-pass drilling without pecking in steel improves productivity on long-reach jobs.
• Specific reach – overall length 250 mm with a flute length of 200 mm provides substantial reach without compromising rigidity.

Ideal for workshops and fabrication environments where deep holes are routine, the A1255/32X250 helps maintenance teams, metalworkers, and machinists cut confidently through steel, aluminum, and stainless steel with a tool that’s built to last. Its durability and proven geometry support accurate hole placement, clean edges, and repeatable results across many drilling tasks.

Practical tips for best results

• Use a light, steady feed and moderate cutting speed to maximize tool life, especially when starting holes in tougher materials.
• Apply appropriate cutting fluid or lubrication to reduce heat build-up and extend edge life on steel via deep-hole work.
• Begin with a pilot hole if accuracy and alignment are critical, then follow with the A1255/X250 for the final deep hole.
• Let the drill do the work—avoid excessive downward pressure that can cause deflection or edge chipping in long-reach drilling.