The Dormer Pramet C618 5/8 Inch HSS-E Flatted Shank 4 Flute End Mill is a regular-length milling cutter designed for shoulder milling, slot milling, and ramping in free-machining and plain carbon steels, as well as copper and copper alloys.

• Diameter: 5/8" (0.625") end mill for standard-tooling interfaces
• Length of cut: 1 5/8" (1.625"), optimized for controlled material removal along shoulders and slots
• Overall length: 3 3/4" (3.75"), providing ample reach for deeper pockets and stepped operations
• Shank: 5/8" Weldon flat shank for secure seating and positive driving in collets or chucks
• Material: HSS-E cobalt-based steel with a bright finish for increased hardness and wear resistance
• Flutes: 4-flute geometry to balance chip clearance and cut quality
• Helix: 30° helix angle, designed for efficient chip formation and smooth cutting in ductile materials
• Geometry use: Optimized for shoulder milling, slot milling, and ramping in free-machining steels and copper alloys
• Standards: ANSI-standard shank and overall dimensions ensure compatibility with common milling setups
• Brand: Dormer Pramet C618, a trusted choice for precision metalworking

Benefiting from a cobalt-enhanced HSS-E core, this end mill delivers superior heat and wear resistance compared with standard high-speed steel, helping maintain sharpness and extend tool life in demanding milling tasks. The flatted Weldon shank reduces slippage under load, while the four cutting edges provide efficient material removal and a cleaner finish. With a 30° helix, the tool promotes steady chip flow and stable cutting action, making it well-suited for shoulder passes, slotting operations, and ramping through free-machining and copper alloys. This end mill is a practical, reliable choice for shops seeking consistent performance in everyday milling workflows.