A precision 4.0 mm ball-nose end mill designed for machinists and CNC operators performing copy milling and detailed contour work in steel and copper alloys. The Dormer Pramet C505 combines a compact 11 mm length of cut with a 2 mm radius for smooth, accurate profiling.

• Diameter: 4.0 mm
• Length of Cut: 11 mm
• Overall Length: 55 mm
• Ball Nose Radius: 2.0 mm
• Flutes: 2
• Shank: Weldon shank 6 mm with flatted section for secure clamping
• Material: HSS-E cobalt-based with bright finish
• Helix: 30°
• Rake Angle: 12°
• DIN Standard: DIN 844 K
• Applications: Copy milling in free machining steel and copper or copper alloys

Thanks to its two-flute design, this tool delivers efficient chip clearance and a clean surface finish on curved geometries. The cobalt-based HSS-E composition provides improved wear resistance for longer tool life in demanding metals, while the bright finish aids visibility and chip evacuation during use. The DIN 844 K specification ensures reliable interchangeability with standard holders, and the welded 6 mm shank with a flat section offers secure, stable mounting for consistent, repeatable results in 3D contouring and slotting applications.