Dormer Pramet A125 2.50 mm x 125 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328

The Dormer Pramet A125 2.50 mm x 125 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is engineered for deep-hole precision and dependable performance in a range of metals. With a robust 118-degree conventional point, this drill starts cuts quickly, delivers clean entry, and remains easy to re-sharpen for repeated use in demanding shop environments.

Key advantages that matter in real-world machining

• — a strong, self-centering tip that reduces wandering and provides reliable alignment on initial contact, which translates to tighter hole tolerances.
• Steam oxide finish — minimizes material adhesion to the cutting edge, leading to smoother drilling, reduced gumming, and easier chip evacuation.
• Extra long length (125 mm) — designed for drilling very deep holes or reaching into recessed workpieces, tool changers, or assemblies where standard-length drills can’t reach.
• Premium HSS material — capable of drilling a variety of common metals, including steel, aluminium, and stainless steel, while maintaining edge retention and strength under heavy use.
• Straight shank — broad compatibility with a wide range of drill chucks and machines, ensuring stable grip and dependable performance in both manual and CNC setups.
• BS 328 specification — built to exacting standards that support consistent sizing and interchangeability in professional workshop environments.

Ideal applications and how this drill performs in the shop

Perfect for shops that frequently drill deep holes or need extended reach in confined fabrication environments, the A125 drill delivers consistent hole quality in a variety of materials. It’s a versatile choice for precision work in automotive components, structural fabrication, appliance housings, and machinery housings where depth and straightness matter as much as diameter.

Practical guidance for best results

• Use appropriate lubrication or coolant when drilling metals to extend tool life and improve surface finish on the hole walls.
• Feed steadily and avoid aggressive plunging to maintain edge integrity, especially when starting a new hole or working in harder steels.
• Pair with a compatible drill chuck or collet system that accepts straight shank tools for maximum clamping stability.
• When re-sharpening, restore the 118° point geometry to preserve cutting efficiency and minimize heat buildup.

Specifications at a glance

• Diameter: 2.50 mm
• Overall length: 125 mm
• Point angle: 118 degrees
• Material: High-Speed Steel (HSS)
• Finish: Steam oxide
• Shank: Straight
• Series: Extra Long
• Standard: BS 328