The Dormer Pramet C618 1/4 Inch HSS-E Flatted Shank 4 Flute End Mill is a reliable, precision cutting tool designed for shoulder and slot milling in steel and copper alloys. Built to ANSI standards with a flatted 3/8" Weldon shank, it delivers steady performance in free‑machining and plain carbon steels.

• Diameter: 1/4" cutting diameter for precise, small-diameter milling
• Flutes: 4-flute geometry to enhance rigidity and chip evacuation
• Length of Cut: 5/8" depth of cut for shallow to moderate milling tasks
• Overall Length: 2-7/16" overall length for reach in confined spaces
• Shank: 3/8" Weldon shank provides secure, repeatable clamping
• Material: Cobalt-based HSS-E for improved heat resistance and wear life
• Finish: Bright finish aids surface finish and ease of cleaning
• Helix Angle: 30° for smooth cutting during shoulder milling, slot milling, and ramping
• Standards: ANSI standard geometry ensures compatibility with common milling setups
• Material Compatibility: Optimized for free machining and plain carbon steel, copper, and copper alloys

The 30° helix promotes efficient chip flow and stable engagement, helping you achieve clean faces and accurate dimensions in steel and copper workpieces. The four-flute design adds rigidity for controlled material removal, while the cobalt-based HSS-E construction stands up to higher cutting temperatures, enabling reliable performance in demanding milling operations. With a flatted shank for secure retention and a compact regular-length form, this end mill is a dependable choice for precise shoulder, slot, and ramp milling across a range of common alloys.