The Dormer Pramet C273 5/8 Inch HSS-E-Powder Metallurgical Flatted Shank Multi-Flute Long Series End Mill is designed for precision shoulder and slot milling in free-machining steels and copper alloys. With extended reach and a robust HSS-E microstructure, it delivers reliable performance in demanding milling applications.

• Diameter: 5/8" (0.625") end mill for versatile milling in medium-to-deep pockets
• Flutes: 4-flute geometry optimized for steady chip evacuation and balanced cutting forces
• Material: HSS-E powder metallurgy with bright finish for improved wear resistance and edge retention
• Shank: Weldon 16 mm shank for secure, repeatable seating in collets or end-mills
• Lengths: 63 mm length of cut (LOC); 123 mm overall length with 74.5 mm reach (neck relief) for deep milling
• Standard: DIN 844 L compliant for compatibility with compatible holders and tooling systems
• Geometry: 30° helix and 12° rake angle designed to optimize cutting forces and chip control
• Applications: Suitable for shoulder milling and slot milling in free machining and plain carbon steel and copper/copper alloys

This end mill combines long-reach capability with precise geometry to handle deep, straight-cutting tasks while maintaining rigidity and predictable performance. The powder-metallurgical HSS-E core offers a tougher cutting edge and extended tool life compared with conventional high-speed steel, making it well-suited for repetitive milling cycles. The bright finish aids visibility of chips and helps reduce built-up edge during cutting. Ideal for shops that need a reliable, deep-reach tool for shoulder and slot milling without frequent tool changes.