The Dormer Pramet C273 1/4" end mill is a long-series, four-flute cutter designed for shoulder and slot milling in free-machining and plain carbon steels, as well as copper and copper alloys. Built to DIN 844 L standards, it features a 10 mm Weldon shank and a powder-metallurgical HSS-E core with a bright finish for reliable performance and long tool life.

• Diameter: 1/4" (6.35 mm)
• Flutes: 4-flute geometry for efficient chip evacuation and stable cutting
• Length of Cut: 30 mm, optimized for shoulder and slot milling
• Overall Length: 80 mm, providing extended reach for deep pockets and channels
• Shank: Weldon 10 mm—flat, secure mounting for minimal runout
• Material: Powder-metallurgical HSS-E with bright finish for improved hardness and edge retention
• Helix and Rake: 30° helix with 12° rake angle to balance cutting forces and chip formation
• Standard: DIN 844 L compatibility for dependable tool-holder interchangeability
• Applications: Shoulder milling and slot milling in free-machining and plain carbon steels, copper and copper alloys

This tool’s powder-metallurgical HSS-E construction delivers enhanced hardness and wear resistance, helping maintain sharpness over more cuts and delivering consistent performance even in tougher workpieces. The 30° helix promotes efficient chip clearance and smoother cuts on shoulders and slots, while the Weldon shank ensures a secure clamping interface to reduce vibration and improve accuracy. With its long-reach design, it’s well-suited for pockets, slots, and deep features without compromising rigidity. Ideal for shop floors seeking durable, high-precision milling in common engineering steels and copper alloys.