The Dormer Pramet C305 slot drill is a precision three‑flute tool designed for shoulder milling, slot milling, and ramping in a range of metals. Built for professional machinists and production environments, its primax flat shank and powder metallurgical HSS‑E core deliver reliable performance with a bright finish.

• Diameter: 11.0 mm
• Number of flutes: 3
• Length of cut: 22 mm
• Overall length: 79 mm
• Shank: 12 mm Weldon shank (DIN 844 K); Primax flat shank design for secure clamping
• Material: Powder metallurgical HSS‑E with bright finish
• Helix angle: 30°
• Rake angle: 12°
• Primary applications: Shoulder milling, slot milling, and ramping
• Material compatibility: Free machining and plain carbon steel, copper and copper alloys, plus Fe‑based, Ni‑based, and Co‑based high‑temperature alloys

In practice, this tool delivers steady performance where slots need clean edges and consistent width. The 3‑flute geometry provides efficient chip evacuation for through slots, while the 30° helix and 12° rake angle support smooth cutting and predictable tool life across a variety of metals. The Weldon shank ensures solid clamping in standard end mill holders, reducing runout and vibration during slot and shoulder milling. With a powder metallurgical HSS‑E composition and a bright finish, you get improved wear resistance and dependable performance in demanding materials, making it a reliable choice for production runs and precision work alike.