Meet the Dormer Pramet C139 3.0 mm HSS-E Powder Metallurgical TiCN-coated slot drill. Designed for precise slot milling, shoulder milling, and ramping in small-diameter work, it’s a reliable choice for machinists working with free-machining steels and related materials.

• Diameter: 3.0 mm
• Length of cut: 8 mm
• Overall length: 52 mm
• Shank: 6 mm Weldon shank with a machined flat for secure clamping
• Material & coating: Powder-metallurgical HSS-E with TiCN coating for improved wear resistance
• Flutes: 2
• Helix angle: 30°
• Rake angle: 12°
• DIN standard: DIN 844 K
• Applications: Shoulder milling, slot milling, and ramping in free machining steels and related materials
• Materials suited: Plain carbon steel, alloy steel, cast iron, copper and copper alloys, titanium and titanium alloys

This slot drill blends the toughness of HSS-E with the wear-resistance of TiCN coating, extending tool life in demanding grooves and slots. The compact 3.0 mm diameter is ideal for tight slots, while the 8 mm depth of cut enables efficient material removal without frequent tool changes. The 2-flute geometry supports effective chip evacuation during slotting, and the 30° helix with a 12° rake angle reduces cutting forces for smoother operation across a range of materials. The 6 mm Weldon shank with a flat ensures secure retention in standard holders, delivering stable, repeatable results. Suitable for production environments that require consistent performance in free machining steels, aluminum alloys, and compatible metals.