Meet the Dormer Pramet A977 4.50 mm HSS-E High Perf Multi-App Straight Shank Extra Long Series drill. Built for depth and precision, this drill is designed to tackle demanding holemaking tasks where reach and reliability matter most.

Key features that redefine deep-hole drilling

• 4.50 mm diameter with a straight shank for compatibility with standard drill chucks and quick rig-up on busy machining cells.
• 130° point promotes self-centering at entry and reduces the push force required, helping keep start-up chatter to a minimum. This is especially helpful when starting holes in tougher materials.
• HSS-E (cobalt-based) material delivers improved wear resistance and performance across a range of materials, including steel, aluminum, and stainless steel.
• Bright finish minimizes material adhesion to the cutting edge, aiding chip evacuation and reducing snagging in long-hole applications.
• Parabolic flute design paired with an extra-long flute length enables drilling very deep holes in a single pass, reducing pecking cycles and increasing productivity.
• Extra-long length tailored for deep-hole work and applications that demand extended reach, all while maintaining robust cutting geometry for dependable drilling in challenging setups.
• DIN 1869 / 2 compliant long-series drill with a cylindrical shank that fits a wide range of machine tools while delivering consistent hole quality over extended flute lengths. 20xD drilling without pecking in steel is a notable capability noted in performance references.

This drill is an ideal choice for professionals who regularly encounter deep holes, tight cavities, or components with recessed features—think automotive, aerospace, and precision equipment manufacturing. It pairs a compact diameter with an extended reach to deliver clean entry and accurate hole sizing in a single pass, reducing cycle times and tool changes.

Why this A977 drill stands out

• Long-reach performance without compromising edge life thanks to HSS-E composition and optimized flute geometry.
• Designed for multi-application use across a variety of materials, from common steels to more exotic alloys.
• Parabolic flute and bright finish work together to keep chips moving smoothly and reduce edge buildup during extended drilling cycles.

In short, the Dormer Pramet A977 4.50 mm HSS-E High Perf Multi-App Straight Shank Extra Long Series drill is a purpose-built solution for deep-hole tasks that demand reliability, reach, and consistent hole quality—delivering precision where many standard drills struggle to reach.

Notes on capabilities and standards: the A977 family is associated with 130° point geometry, cobalt-based HSS-E, bright finish, quick spiral, and parabolic web designed for deep drilling (up to 20xD in steel under appropriate conditions), with DIN 1869 / 2 compliance for long-length drills. These design choices translate into fewer tool changes, smoother starts, and dependable performance in demanding environments.