The Dormer Pramet C428 25.0 mm HSS-E powder-metallurgy end mill is built for aggressive roughing across a variety of metals. With a flatted 25 mm Weldon shank and a six-flute, high-efficiency geometry, it excels in shoulder milling, slot milling, and ramping work in alloy and tool steels, stainless steels, cast iron, copper alloys, and high-temperature alloys.

• Diameter: 25.0 mm
• Flutes: 6
• Length of cut: 45 mm
• Overall length: 121 mm
• Reach with neck relief: 64.5 mm
• Shank: Weldon, 25 mm
• Shank geometry: Flatted shank for secure clamping and reduced slip
• Material: HSS-E powder metallurgy with Alcrona coating
• Coating: Alcrona
• Geometry profile: HRA asymmetrical fine pitch
• Helix angle: 35°
• Rake angle: 12°
• Standard: DIN 844 K
• Applications: Shoulder milling, slot milling, and ramping
• Recommended materials: Alloy tool steel, stainless steel, cast iron, copper and copper alloys, and high-temperature alloys

In use, the combination of powder-metallurgically enhanced HSS-E and the Alcrona coating delivers durable wear resistance and reliable performance under heavy cutting loads. The 6-flute design supports efficient chip evacuation for higher material removal rates, while the 35° helix and 12° rake angle help maintain smooth cutting action and good surface quality on shoulders and ramps. The flatted shank and substantial reach (64.5 mm neck relief) enable secure engagement in longer reach applications without sacrificing rigidity, making this end mill a versatile choice for demanding roughing tasks across diverse materials. DIN 844 K compatibility ensures it fits standard toolholders and setups, supporting quick changes in busy workshops.