The Dormer Pramet C135 18.0mm HSS-E slot drill is a short-series, two-flute cutter engineered for precise slot milling in free‑machining steel and copper alloys. With a 16 mm Weldon shank and a cobalt-based HSS-E core, it delivers reliable performance in demanding milling tasks.

• Diameter: 18 mm
• Number of Flutes: 2 flutes
• Length of Cut: 32 mm
• Overall Length: 123 mm
• Reach (Neck Relief): 74.5 mm
• Shank: 16 mm Weldon shank (Dormer standard)
• Material: Cobalt-based HSS‑E with bright finish
• Helix: 30° helix for efficient cutting and chip formation
• Rake Angle: 12°
• Applications: Slot milling in free‑machining steel and copper or copper alloys

This tool is designed to deliver clean, consistent slots with improved wear resistance and long tool life in metallic alloys. The 16 mm Weldon shank ensures secure, repeatable clamping in standard toolholding, while the 30° helix and 12° rake optimize cutting action for smooth chip evacuation and good surface finish. The combination of a compact cut length, substantial reach, and neck relief enables reliable access to deeper slots and tight radii without sacrificing rigidity, making it a dependable choice for production milling and maintenance tasks alike.