Dormer Pramet A125 1/4 Inch x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 1/4 Inch x 200 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a purpose-built drill bit designed for serious metalworking challenges. If you’re tackling deep holes, tight access, or long bore paths, this drill bit delivers reliable performance, precision, and durability in one compact tool.

What makes this drill special

• 118° conventional point for a strong, self-centering start that minimizes wandering and enables a clean hole from the first cut. When re-sharpening is required, the point remains easy to re-grind, keeping downtime to a minimum.
• Steam oxide finish reduces friction and minimizes built-up edge from workpiece material, helping you achieve smoother drilling and longer flank life in challenging metals.
• Extra-long length (200 mm) and a straight shank design provide exceptional reach for drilling very deep holes or accessing bores in awkward or recessed locations without sacrificing rigidity.
• Premium HSS (High-Speed Steel) construction offers broad material versatility — ideal for drilling steel, aluminum, and stainless steel with dependable performance and heat resistance.
• BS 328 compliance and standardization ensure compatibility with a wide range of drill chucks and drilling machines, reducing setup time and increasing interchangeability across tools.
• Versatile without compromise — while built for deep holes, this drill bit remains practical for a variety of metalworking tasks in workshops, fabrication shops, and on-site projects.

Why deep-hole accessibility and precision matter

When deep drilling is a consistent requirement, you need a bit that preserves hole accuracy from start to finish. The A125’s geometry minimizes deflection, maintaining true alignment through long bores. The combination of an athletic cutting edge, robust steel core, and steam-oxidized surface delivers predictable chip clearing, steadier feed, and cleaner bore walls — even in tougher materials.

Ideal use cases

• Deep holes in steel plates, tubing, and frames where standard-length bits can’t reach.
• Through-holes in automotive or machinery components where precise depth control is essential.
• Fabrication work requiring a single drill bit to cover multiple metals, including mild steel and aluminum alloys.
• Maintenance and repair tasks in industrial settings where reliability and extended tool life are critical.

Practical tips for最佳 results

• Match the drill speed and feed rate to the material — slower speeds for harder metals and appropriate lubrication to control heat buildup.
• Start with a light pilot hole if working with very thick sections to improve stability and reduce wandering.
• Keep the edge sharp and re-sharpen as needed; the 118° point is straightforward to re-grind for consistent performance.
• Use a compatible chuck with a secure grip on the straight shank to maximize rigidity and reduce runout during deep drilling.

Materials, durability, and value

Designed for reliability, the Dormer Pramet A125 combines a tough HSS core with an oxide-protected surface to resist wear and heat. This means fewer tool changes, more holes per shift, and cleaner, more consistent bore diameters. For shops that routinely drill deeply into metal workpieces, this bit is a straightforward upgrade from shorter, standard-length bits that struggle with reach and stability.

In short, the Dormer Pramet A125 1/4 Inch x 200 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is the practical choice for professionals who demand precision, reach, and durability in a single drill bit. It handles a broad range of metals with confidence, supports deep drilling tasks without compromising bore quality, and remains easy to maintain and re-sharpen as needed.