The Dormer Pramet C305 4.0 mm HSS-E-Powder Metall Primax slot drill is a compact, high-precision tool designed for tight-slot and shoulder milling in steel and alloys. Built for professionals who need dependable small-diameter milling, it combines durable powder-metallurgy HSS-E with a robust Weldon shank for secure, repeatable clamping.

• Diameter: 4.0 mm
• Flutes: 3-flute design for efficient chip clearance and stable cutting
• Length of cut: 11 mm
• Overall length: 55 mm
• Shank: Weldon shank, 6 mm
• Material: HSS-E powder-metallurgy with bright finish
• Helix angle: 30° for effective chip evacuation
• Rake angle: 12°
• Standard: DIN 844 K
• Applications: Shoulder milling, slot milling and ramping in free-machining and plain carbon steel, copper and copper alloys, and Fe-, Ni-, Co-based high-temperature alloys

Designed for precision and versatility, this 4 mm slot drill handles shallow to mid-depth slots with clean edges. The 3-flute configuration supports smooth entry and efficient chip removal, while the 30° helix and 12° rake angle optimize cutting action in a range of materials, including free-machining and high-temperature alloys. The powder-metallurgy HSS-E core offers enhanced wear resistance and toughness, helping the tool maintain accuracy over prolonged use. The Weldon shank ensures a rigid, minimal-runout clamping fit, reducing vibration and improving repeatability in die/mold work, automotive components, and general machining tasks.