The Dormer Pramet C505 20.0mm HSS‑E Ball Nose End Mill is a durable two‑flute slot drill designed for precise copy milling in free‑machining steel and copper alloys. With a Weldon 20 mm shank and a full‑radius ball nose, it delivers smooth, accurate 3D contours on complex surfaces.

• Diameter: 20.0 mm
• Flutes: 2
• Length of Cut: 38 mm
• Overall Length: 104 mm
• Reach (Neck Relief): 53.5 mm
• Radius: 10.0 mm (full profile)
• Shank: Weldon 20 mm
• Material: HSS‑E cobalt‑based with bright finish
• Helix Angle: 30°
• Rake Angle: 12°
• Standard: DIN 844 K
• Applications: Copy milling in free‑machining steel and copper/copper alloys

This ball‑nose end mill combines a robust cobalt‑based HSS‑E composition with a bright finish for durable performance and reliable finishes on curved pockets and contours. The 30° helix improves chip evacuation and cutting efficiency, while the 12° rake angle helps control built‑up edge during demanding copy milling tasks. The 20 mm Weldon shank provides rigid clamping in standard holders, enabling precise transfers of complex profiles without deflection. With a generous reach and a 10 mm full radius, it excels at deep pockets, fillets, and smooth radius transitions in steel and copper alloys.