The Dormer Pramet C346 15.0 mm HSS-E Flatted Shank 3-Flute Long Series Slot Drill (DIN 844 L) is a high-reach end mill designed for shoulder milling and slot milling in free‑machining steel and copper alloys. Built around a cobalt-enhanced HSS-E core, it delivers dependable performance with a long cutting length for deep pockets and slots.

• Diameter: 15.0 mm
• Flutes: 3-flute long-series design for stable cutting and efficient chip control
• Length of cut (LOC): 53 mm for deeper pockets and extended slots
• Overall length: 110 mm to reach through longer workpieces
• Reach with neck relief: 64.5 mm for accessing deep geometry while maintaining rigidity
• Shank: 12 mm Weldon shank with a flatted section for secure clamping
• Material: HSS‑E cobalt-based steel with bright finish for enhanced hot hardness
• Helix and rake: 30° helix and 12° rake angle optimized for shoulder and slot milling
• Standard: DIN 844 L compliant for compatibility with standard holders
• Applications: Shoulder milling and slot milling in free machining steel and copper/copper alloys

Designed to deliver precise slots and shoulders, this tool combines a robust 3‑flute geometry with long reach to minimize tool changes and maximize productive milling on challenging materials. The cobalt-based HSS‑E composition maintains edge durability under higher temperatures, extending tool life in free machining steels and copper alloys. The flatted 12 mm Weldon shank provides secure, repeatable clamping in common end-mill holders, while neck relief preserves full cutting length for deeper work without sacrificing rigidity.