The Dormer Pramet C346 4.0 mm HSS-E long-series slot drill is a precision end mill designed for shoulder milling and deep slot work in free machining steel and copper alloys. With a cobalt-based HSS-E core and a rugged Weldon 6 mm shank, it delivers dependable performance in demanding milling tasks.

• Diameter: 4.0 mm
• Length of Cut: 19 mm
• Overall Length: 63 mm
• Shank: 6 mm Weldon shank
• Flutes: 3-flute design
• Material: Cobalt-based HSS‑E with bright finish
• Helix/Rake: 30° helix, 12° rake angle
• DIN Standard: DIN 844 L
• Applications: Shoulder milling and slot milling in free machining steel and copper/copper alloys

The tool's 3-flute geometry and 30° helix are optimized for efficient chip evacuation and smooth cutting in narrow slots and shoulder contours. The 12° rake angle reduces rubbing and helps maintain a clean edge, while the cobalt-based HSS‑E construction enhances wear resistance for longer tool life in tougher alloys. A DIN 844 L-compliant design ensures interchangeability with standard holders, and the 6 mm Weldon shank provides a secure grip in collets or end-mill adapters. The long-series reach (63 mm overall length with a 19 mm cut) lets you access deeper slots and shoulders without sacrificing rigidity, making this drill well-suited for busy machine shops that demand reliability and consistent results.