The Dormer Pramet C139 10.0 mm HSS-E slot drill is a precision two-flute tool designed for reliable slot milling, shoulder milling, and ramping in a range of metals. It’s built for machinists who demand consistent performance in free‑machining steels, cast iron, copper alloys, and titanium alloys.

• Diameter: 10.0 mm
• Flutes: 2-flute geometry optimized for efficient chip evacuation
• Length of cut: 22 mm
• Overall length: 72 mm
• Reach with neck relief: 31.5 mm
• Shank: Weldon 10 mm for secure seating in standard tooling
• Material and coating: HSS‑E, powder‑metallurgical substrate with TiCN coating
• Helix and rake: 30° helix, 12° rake angle for smooth cutting action
• Standard: DIN 844 K
• Applications: Slot milling, shoulder milling, and ramping in free‑machining steel, plain carbon steel, alloy steel, cast iron, copper alloys, and titanium alloys

Thanks to the combination of a powder‑metallurgical HSS‑E substrate and a TiCN coating, this slot drill delivers enhanced wear resistance and longer tool life in demanding materials while maintaining precise geometry for clean, accurate slots. The 30° helix and 12° rake angle balance cutting forces and chip formation, promoting smooth entry and reduced vibration. The compact 22 mm length of cut with a generous 31.5 mm reach lets you access tight pockets, shoulders, and ramps without sacrificing rigidity. The Weldon shank ensures reliable clamping and repeatable performance in standard setups.