Dormer Pramet A117 3.40 mm HSS-E STRAIGHT SHANK STUB DRILL DIN 1897

Meet the Dormer Pramet A117 3.40 mm HSS-E Straight Shank Stub Drill, a precision drill bit designed for reliable metalworking performance. With a 3.40 mm diameter and a DIN 1897 straight shank, this bit fits standard chucks and is built for clean, accurate holes in demanding materials.

Designed for engineers, machinists, fabricators, and serious hobbyists, it delivers consistent hole quality and a smoother finish in hard metals, including tool steel. Its compact stub design makes it ideal for tight spaces and repetitive drilling tasks, helping you move from setup to finished holes with confidence.

• 135° split point for self-centering: Starts cutting on contact, minimizes wandering, and reduces the push force required to begin a hole, improving accuracy and reducing tool load during entry.
• Bronze oxide finish: Reduces built‑up edge by preventing material from sticking to the cutting edge, promoting smoother chip evacuation and longer edge life.
• Premium HSCO material: Co cobalt-containing alloy that enables dependable drilling of hard materials, including tool steel, delivering tougher performance and extended service life.

In practice, this drill bit helps you achieve precise, repeatable results with fewer rework sessions. The combination of self-centering entry, protective coating, and hard-material capability supports faster, more predictable workflows, giving you the reliability you need for demanding projects and busy shop schedules.