Dormer Pramet A125 1/8 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Meet the Dormer Pramet A125 1/8 Inch x 310 mm HSS Straight Shank Extra Long Series Drill BS 328 — a purpose-built solution for deep-hole drilling where reach and reliability matter most. This is not just a longer bit; it’s a strategic upgrade for workflows that demand precision in tight spaces, through thick workpieces, or when a standard drill can’t reach the job.

Why this drill stands out

• 118° conventional point — delivers a strong, self-centering starting angle that minimizes wandering and makes initial penetration predictable. The geometry also lends itself to easy re-grinding when you need to refresh the edge and extend tool life.
• Steam oxide finish — a low-friction, wear-reducing layer that helps chips shed cleanly from the cutting edge, reducing built-up material on the flute and improving hole quality, especially on steel and alloys.
• Extra-long length (310 mm) — engineered for drilling very deep holes or accessing recessed areas where a standard drill cannot reach. The extended reach helps you complete complex assemblies and reduces the need for auxiliary drilling setups.
• Premium HSS material — high-speed steel provides the balance of toughness and heat resistance needed for drilling a range of metals, including steel, aluminum, and stainless steel, with reliable edge retention.
• Straight shank — compatibility with a wide array of drill chucks and collet systems ensures straightforward, secure tool changes across bench drills, drill presses, and compatible handheld machines.
• Versatile by design — this drill excels in workshops, fabrication shops, automotive repair bays, and maintenance environments where deep drilling and material versatility are daily requirements.

Ideal applications and practical use

Use the Dormer Pramet A125 1/8" x 310 mm drill for deep-hole tasks across common metals. It’s particularly well-suited for:

• Fabrication and metalworking where holes must pass through multiple layers or long assemblies
• Automotive and aerospace components with thick sections or intricate internal cavities
• Maintenance tasks that require reaching into confined spaces without repositioning the workpiece repeatedly

What problems it solves

• Overcomes reach limitations of standard-length drills, reducing the need for intermediate steps or hacks to reach deep holes
• Provides a stable starting point and predictable cut even in harder metals thanks to the 118° point geometry
• Minimizes material buildup and chatter with a steam oxide finish, promoting cleaner holes and longer tool life
• Delivers reliable performance across a variety of materials, making it a dependable addition to mixed-use toolkits

Tips for optimal results

To maximize lifespan and hole quality with this extra-long HSS drill:

• Choose speeds and feeds appropriate for the material and depth you’re drilling; start conservatively and increase gradually only if the cut remains clean and steady.
• Use a cutting fluid or light lubrication to reduce heat buildup, especially on stainless steel or thicker sections.
• Secure the workpiece firmly and minimize side loads to prevent bending or breakage of the long drill.
• Re-grind the 118° point as needed to maintain a sharp cutting edge and consistent hole geometry.

Specification snapshot

• Diameter: 1/8 inch
• Length: 310 mm
• Material: High-Speed Steel (HSS)
• Shank: Straight
• Point: 118 degrees
• Finish: Steam oxide
• Series: Extra Long
• Standard: BS 328

Note: This description focuses on the features and practical benefits of a single, extended-reach drill designed for deep drilling. The image included shows the Dormer Pramet brandmark as part of the product presentation.