Dormer Pramet A125 5.00 mm x 200 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

Introducing the Dormer Pramet A125 5.00 mm x 200 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a precision-drill built for deep-hole tasks and tough metalworking environments. With an 118° conventional point, this bit delivers a sharp, reliable entry that resists wandering and stays easy to re-sharpen when needed, keeping downtime to a minimum.

What makes this drill stand out

• 118° conventional point: A robust geometry that bites cleanly into ferrous and non-ferrous materials, providing predictable starts and smoother hole creation. The point remains easy to re-grind, helping you extend tool life without surprise deviations.
• Steam oxide finish: A protective oxide layer minimizes workpiece material from sticking to the cutting edge, reducing built-up edge and promoting steadier chip flow for cleaner holes.
• Extra-long length (200 mm): Specifically designed for drilling very deep holes and for applications where extended reach is essential, all while maintaining solid rigidity and control in a wide range of setups.
• Premium HSS material: High-speed steel delivers reliable performance across common metals — steel, aluminium, and stainless steel — making this drill versatile enough for mixed-material projects.
• Straight shank compatibility: Standard straight shank works with most drill chucks and collets, ensuring smooth mounting and transfer of torque for consistent drilling.
• BS 328 compliant: This specification confirms the drill’s dimensional accuracy and quality standards, giving you confidence in repeatable results across jobs.

Ideal use cases

Best suited for workshops and production settings where hole depth exceeds standard drill reach. Use it for deep blind holes, through-holes in steel and aluminum assemblies, or when you need an extended-length bit to access confined workpieces without repositioning the entire setup. Its durable HSS composition handles a variety of materials, making it a reliable choice in mixed-metal environments.

Practical tips for optimal results

• Apply a light cutting fluid or oil to reduce heat buildup and extend tool life, especially when drilling stainless steel or hard alloys.
• For very hard materials, begin with a smaller pilot hole to establish the correct trajectory and reduce drilling forces.
• Maintain steady feed pressure and avoid aggressive plunging to prevent wandering and edge chipping, then withdraw periodically to clear chips.
• Slower spindle speeds with steady feeds work well for steel and stainless steel; higher speeds can be effective for soft aluminum when paired with proper lubrication.
• The 118° point is designed for re-grinding; inspect the edge regularly and restore geometry to preserve cutting efficiency across multiple uses.

Specifications at a glance

• 5.00 mm
• 200 mm
• Straight
• Premium HSS (High-Speed Steel)
• 118° conventional
• Steam oxide
• BS 328
• Extra Long

Choose the Dormer Pramet A125 for reliable, long-reach drilling where depth and versatility matter. This drill bit is purpose-built for professionals who refuse to compromise on precision, durability, or practicality in demanding metalworking environments.