The Dormer Pramet C305 20.0 mm HSS-E Powder Metallurgical Primax slot drill is built for precision slot milling, shoulder milling, and ramping. Designed for engineers and machinists who demand dependable performance, it combines a flatted Weldon shank with a robust 3‑flute geometry for consistent cuts and easy setup.

• Diameter: 20.0 mm
• Length of cut: 38 mm
• Overall length: 104 mm
• Reach with neck relief: 53.5 mm
• Shank type: Weldon 20 mm, flatted shank for secure seating
• Flutes: 3-flute design for efficient chip evacuation
• Material: HSS-E powder metallurgical with bright finish
• Helix angle: 30°
• Rake angle: 12°
• Standard: DIN 844 K
• Applications: Slot milling, shoulder milling, and ramping in carbon steels, copper and copper alloys, and Fe-/ Ni-/ Co-based high-temperature alloys

This tool is optimized to minimize chatter and deliver clean, precise slots with every pass. The 30° helix and 12° rake promote smooth entry and efficient chip evacuation, helping to extend tool life in hard materials. The powder-metallurgical HSS-E construction offers improved wear resistance and toughness compared with traditional HSS, making it suitable for demanding alloys. The Weldon shank and flatted surface ensure stable clamping for consistent depth control, while the generous reach and neck relief enable deeper pockets and longer-slot milling without sacrificing rigidity. Ideal for production environments where interchangeability with standard DIN 844 K holders is essential, this drill supports reliable, repeatable results across plain carbon steel, copper alloys, and high-temperature alloys.