The Dormer Pramet A125 11.00 mm x 400 mm HSS ST Straight Shank Extra Long Series Drill (BS 328) is engineered for depth-driven machining where reach matters as much as precision. With an 11 mm diameter and a substantial 400 mm overall length, this drill is purpose-built to navigate deep bores without frequent part repositioning, boosting productivity in fabrication, automotive, and industrial settings.

Precision geometry for reliable holes

Equipped with an 118-degree conventional point, this drill delivers a strong cutting edge that resists wandering on contact and maintains cut quality over time. The point is straightforward to re-grind, helping shops extend tool life without sacrificing accuracy. Whether you’re starting a hole in steel, aluminum, or stainless steel, you get consistent performance from first insertion to final depth.

Steam oxide finish for smoother cutting

The steam oxide coating reduces adhesion between the workpiece and the cutting edge, minimizing built-up edge in challenging materials. This translates to cleaner entry, smoother chip flow, and less heat buildup during long drilling cycles—especially useful when piercing through tough or layered workpieces.

Extra-long reach for deep-hole applications

Designed for applications where standard-length drills fall short, the extra-long series excels at drilling very deep holes, pockets, or through-holes in multi-feature assemblies. This makes it ideal for long cavities, chassis work, or components with extended bosses where access is limited and accuracy at depth is critical.

Premium HSS for versatile material coverage

Crafted from premium high-speed steel, the A125 drill handles a wide range of materials, including steel, aluminum, and stainless steel. The robust composition provides dependable wear resistance and dependable performance across common metals encountered in workshops, toolrooms, and production floors.

Practical advantages that save time and effort

• Consistent hole quality from start to finish thanks to reliable geometry and durable edge retention.
• Easy re-sharpening with a straightforward point geometry, reducing tool-change frequency in busy environments.
• Straight shank compatibility ensures simple clamping in standard chucks and collets, minimizing setup time.
• Deep-hole versatility supports drilling operations where alternative tools would require multi-step setups or longer workflow times.

Ideal use cases

• Deep-hole drilling in steel frames, housings, and structural components where access is constrained.
• Through-holes in automotive and machinery assemblies requiring precise alignment over long bore depths.
• Fabrication and prototyping tasks where consistent hole quality across multiple workpieces reduces rework.

Specification snapshot

• Diameter: 11.00 mm
• Overall length: 400 mm
• Working length: extended (extra-long series)
• Tip: 118-degree conventional point
• Shank: straight
• Material: premium high-speed steel (HSS)
• Finish: steam oxide
• Standard: BS 328

For workshops that demand depth, durability, and dependable performance without compromising hole quality, the Dormer Pramet A125 11.00 mm x 400 mm HSS ST Straight Shank Extra Long Series Drill stands up to the task. It pairs a robust cutting edge with a long reach, delivering consistent results across a broad range of metals and applications—even in challenging deep-hole scenarios.