Durable, small-diameter end mill designed for precise shoulder and slot milling in free‑machining steels and copper alloys. The Dormer Pramet C273 4.5 mm HSS‑E powder metallurgical end mill combines long reach with solid rigidity for repeatable, clean finishes on tight features.

• Diameter: 4.5 mm
• Length of cut: 19 mm
• Overall length: 63 mm
• Flutes: 4‑flute geometry for efficient chip evacuation
• Material: HSS‑E powder metallurgical steel with a bright finish
• Shank: 6 mm Weldon shank for secure clamping
• Helix and rake: 30° helix with 12° rake angle for smooth cutting and good chip control
• Standard: DIN 844 L, ensuring interchangeability with compatible long‑series tools
• Applications: Shoulder milling and slot milling in free‑machining steel and copper/copper alloys
• Series: Long series end mill for extended reach in deeper pockets

This tool’s powder‑metallurgical HSS‑E core delivers enhanced hardness and wear resistance, helping to extend tool life in demanding materials. The 30° helix reduces cutting forces and improves surface finish on both shoulders and slots, while the 12° rake angle supports efficient chip evacuation and minimizes rubbing. The 6 mm Weldon shank provides stable seating in standard collets, promoting precision and reducing runout. With DIN 844 L compliance, it integrates smoothly into existing automated or manual milling setups. Ideal for small‑diameter, high‑precision work, it delivers reliable performance from initial pass through finishing operations in a variety of steels and copper alloys.