The Dormer Pramet C139 4.0 mm slot drill is a high‑performance HSS-E tool designed for precise slotting, shoulder milling, and ramping in free‑machining steels and related materials. Built for reliability in production environments, it combines robust wear resistance with a precise, clean cutting action.

• Diameter: 4.0 mm
• Length of cut: 11 mm
• Overall length: 55 mm
• Shank: Weldon, 6 mm
• Material & coating: Powder metallurgical HSS‑E with TiCN coating
• Flutes: 2
• Helix angle: 30°
• Rake angle: 12°
• Standard: DIN 844 K
• Applications: shoulder milling, slot milling, and ramping in free machining steels, plain carbon and alloy steels, cast iron, copper or copper alloys, and titanium or titanium alloys

This slot drill is optimized for repetitive machining tasks where consistent slot width and clean bottoms matter. The 2‑flute geometry accelerates chip evacuation in slots, while the TiCN coating reduces wear and helps maintain sharpness across multiple passes. The DIN 844 K specification guarantees compatibility with standard tooling setups, and the 6 mm Weldon shank offers secure, reliable clamping in common tool holders. Whether you’re milling precise slots, finishing shoulders, or ramping into a pocket, this drill delivers predictable performance with tight tolerances.