The Dormer Pramet C346 3.0mm slot drill is a long-series, 3-flute end mill designed for precise shoulder and slot milling in free-machining steel and copper alloys. Built for reliability in tight slots, it pairs a cobalt-based HSS-E core with a robust Weldon shank to deliver consistent performance across challenging materials.

• Diameter & Flutes: 3.0 mm diameter with 3 flutes for efficient material removal and stable cutting in narrow slots.
• Length & Reach: 12 mm length of cut (LOC) and 56 mm overall length for extended reach in deep slots and shoulders.
• Shank & Standard: Weldon shank (6 mm) compatible with common collets and holders; DIN 844 L compliant for standardized seating.
• Material & Finish: HSS‑E cobalt-based steel with a bright finish, offering enhanced hardness and wear resistance at elevated cutting temperatures.
• Geometry: 30° helix angle with a 12° rake angle optimized for smooth cutting and clean shoulders in metalworking.
• Primary Applications: Ideal for shoulder milling and slot milling in free-machining steel and copper or copper alloys, delivering dependable performance in constrained slots.

In practice, this tool equips machinists to create precise pockets and slots with predictable diameters and finished surfaces. The combination of a long series reach, three flutes for efficient chip evacuation, and cobalt-based HSS-E durability means longer tool life in demanding metals, reduced rework, and consistent results across production runs.