Dormer Pramet A125 4.50 mm x 250 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 4.50 mm x 250 mm HSS straight shank extra long series drill (BS 328) is purpose-built for demanding metalworking tasks that require deep, accurate holes. Its 118-degree conventional point delivers a strong, self-centering start that resists walk and is easy to re-grind for extended tool life, so you can maintain precision without frequent replacements.

Key features that redefine deep-hole drilling

• 118-degree point for clean starts, reduced wandering, and straightforward re-sharpening when needed.
• Steam oxide finish minimizes workpiece material sticking to the cutting edge, promoting smoother chips and longer edge life.
• Extra long length designed to reach deep cavities and through-holes, ideal when access is limited or workpieces require extended reach.
• Premium HSS material handling a broad range of metals—steel, aluminum, and stainless steel—with reliable performance under higher cutting temperatures.
• Straight shank provides compatibility with most drill chucks and automation equipment, ensuring a stable cut in a variety of machines.
• BS 328 compliant specification signals compatibility with established standards and expectations for precision and durability.

Why this drill bit stands out

In daily fabrication and maintenance environments, you need a drill that delivers consistent hole quality from start to finish. The A125’s long flute geometry promotes efficient chip evacuation, reducing the risk of clogging when drilling deeper into metal workpieces. Its steel-ready construction supports a wide range of applications—from fabricating steel frames to machining aluminum enclosures—without needing a different tool for each material.

Ideal use cases

• Deep-hole drilling in steel components, housings, and motor mounts where access is constrained.
• Precise pilot-and-drill operations in aluminum frameworks and light alloys.
• Through-holes in stainless steel assemblies requiring robust edge retention and clean finishes.
• Maintenance and repair work in metalworking shops, automotive fabrication, and equipment manufacturing.

Practical tips to maximize performance

• Use appropriate cutting fluid or coolant to reduce heat buildup and prolong tip life.
• Secure the workpiece firmly and minimize chatter with proper fixturing—rigidity is key for deep drilling.
• Begin with a shallow pilot hole if the workpiece is hard or has a tendency to grab, then gradually increase depth.
• Work within the recommended speed and feed ranges for HSS drills to prevent premature wear.
• Inspect the point and re-sharpen when you notice losing edge geometry or rough hole finishes.