Dormer Pramet A125 5/32 Inch x 160 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

When you need serious reach without compromising cutting performance, the Dormer Pramet A125 5/32 Inch x 160 mm HSS ST Straight Shank Extra Long Series Drill (BS 328) is built to deliver. This drill is tuned for depth and precision, making it a workhorse for metal fabrication, maintenance, and general workshop tasks.

Key features that matter in real-world work

• 118-degree conventional point — provides a strong, self-centering starting point that’s easy to re-grind when needed, helping you maintain accuracy on both initial entry and subsequent passes.
• Steam oxide finish — reduces cutting-edge adhesion with workpiece material, promoting smoother chips evacuation and cleaner holes, especially in steel and alloy workpieces.
• Extra-long length series — purpose-built for drilling very deep holes or reaching into crowded workpieces where standard drills can’t reach, all while keeping straight, rigid drilling for better hole quality.
• Premium HSS material — versatile across a range of metals, including steel, aluminum, and stainless steel, delivering dependable performance under demanding shop conditions.
• Straight shank design — straightforward compatibility with common drill chucks, guaranteeing secure grip and minimal runout in typical machining setups.
• BS 328 designation — a trusted standard that aligns with common metric-to-imperial drilling references, making it a reliable choice for professional shops and DIY setups alike.

Dimensions at a glance

• Diameter: 5/32 inch (0.15625 in)
• Overall length: 160 mm
• Shank: Straight
• Tip: 118-degree point

Practical in-work applications

• Deep hole drilling in steel plates, brackets, and long structural members where shorter bits won’t reach.
• Precision pilot and through-holes in aluminum and stainless components where clean entry and minimal deflection are essential.
• Maintenance tasks in tight housings or assemblies with limited clearance, allowing you to drill without repositioning the workpiece.
• Prototyping and fabrication projects that demand repeatable depth and reliable hole quality across multiple tools.

Tips for best results

• Use a suitable cutting fluid or light oil to reduce heat buildup and extend drill life, especially on deeper holes.
• Start with a shallow pilot hole if the material is hard or prone to wandering, then proceed to full depth with steady, even feed.
• Clamp the workpiece securely to minimize deflection and ensure you maintain a straight path through the material.
• Clear chips regularly during deep drilling to prevent clogging and heat buildup; retract the bit occasionally to clear debris.

Who benefits most

This extra-long HSS drill is ideal for professional machinists, fabrication shops, maintenance technicians, and serious hobbyists who routinely work with thick materials or constrained spaces. If you need reliable deep-hole capability without swapping between tools, the A125 is a dependable, long-term addition to your drill assortment.