The Dormer Pramet C273 5.5 mm HSS-E powder metallurgy end mill is a long-series tool designed for shoulder and slot milling in steel and copper alloys. It’s built for professionals who need reliable reach and precise results in deep milling operations.

• Diameter: 5.5 mm
• Length of Cut (LOC): 24 mm
• Overall Length: 68 mm
• Flute Count: 4-flute configuration for efficient chip evacuation
• Shank: 6 mm Weldon shank for rigid, secure clamping
• Material: HSS‑E powder metallurgy with a bright finish for improved wear resistance
• Helix Angle: 30° to promote steady cutting and effective chip flow
• Rake Angle: 12° to optimize cutting action and reduce burr formation
• Standard: DIN 844 L long-series geometry
• Applications: Shoulder milling and slot milling in free machining and plain carbon steel, copper and copper alloys

This end mill is designed to extend tool life in demanding milling tasks while maintaining precise dimensions. The 4-flute geometry provides smooth cutting action and efficient chip evacuation, helping to reduce heat buildup in long-reach applications. The powder-metallurgically produced HSS‑E core delivers increased wear resistance and durability when machining tough steels, while the bright finish helps minimize built-up edge. The 6 mm Weldon shank offers secure clamping, reducing runout and chatter for cleaner shoulders and slots. Whether you’re detailing pockets, finishing slots, or performing shoulder milling in copper alloys or plain carbon steel, this tool delivers consistent performance and dependable results.