Dormer Pramet A977 4.00 mm HSS-E HIGH PERF MULT-APP STRAIGHT SHANK EXTRA LONG SERIES (2) DRILL DIN 1869 / 2

Engineered for precision and reach, the Dormer Pramet A977 4.00 mm HSS-E High Performance Multi-Application Straight Shank Extra Long Drill (DIN 1869 / 2) is a trusted choice for engineers tackling deep-hole work in a variety of materials. This two-pack is designed to deliver consistent, reliable results when you need to drill deeper than standard bits without sacrificing accuracy.

Key features that matter in real-world drilling

• 130-degree point for self-centering starts and reduced push force, helping to minimize wandering and improve hole accuracy right from the first cut.
• Bright finish minimizes built-up edge and material sticking to the cutting edge, promoting cleaner holes and easier chip removal.
• Parabolic flute design tailored for extra-deep holes, enabling efficient chip evacuation and stable cutting in a single pass.
• Premium HSS-E material delivers dependable performance across a wide range of materials, including steel, aluminium, and stainless steel, with enhanced wear resistance and heat tolerance.
• Extra-long length series provides the reach you need for deep cavities, long bores, or workpieces with limited access, while maintaining rigidity when properly clamped.
• Straight shank (DIN 1869 / 2) ensures broad compatibility with common drill chucks and holders, making it a versatile choice for mixed-tool environments.
• Pack of 2 drills lets you keep a spare on hand for uninterrupted production or progressive drilling tasks.

Practical use cases and how this drill helps

Ideal for deep-hole drilling in metalworking, automotive fabrication, aerospace component manufacturing, mold making, and maintenance tasks where access is constrained. The A977’s combination of a precise 4.00 mm diameter, extended reach, and efficient chip evacuation means you can:

• Start holes cleanly in hard-to-reach locations without needing aggressive starting feeds.
• Drill through thicker sections or long workpieces with fewer passes, reducing cycle times.
• Maintain hole concentricity and surface finish even in challenging materials like stainless steel and aluminium.

How to get the best from this drill

For optimal results, clamp the workpiece securely and use appropriate lubrication or cutting fluid to manage heat. Begin with a conservative feed rate and steady RPM, then adjust based on material behavior and chip formation. When drilling deep holes, ensure regular chip clearance to prevent re-cutting and workpiece deformation, and re-slow the feed as you approach final depths for a clean exit.