Dormer Pramet C135 8.0mm HSS-E Flatted Shank 2 Flute Standard Length Slot Drill

Designed for precise slot milling in free‑machining steels and copper alloys, the Dormer Pramet C135 8.0mm HSS‑E slot drill delivers reliable, repeatable cuts with a durable cobalt‑enriched geometry. Its flatted Weldon shank and compact 2‑flute design make it ideal for everyday slotting tasks on standard milling machines.

• Diameter: 8.0 mm
• Flutes: 2 flute design for efficient slotting and chip evacuation
• Length of cut: 19 mm
• Overall length: 88 mm
• Reach with neck relief: 48 mm
• Shank: 10 mm Weldon shank with a flatted surface for secure clamping
• Material: HSS‑E cobalt‑based steel with a bright finish
• Helix: 30° helix for smooth cutting and steady chip flow
• Rake angle: 12° rake to improve cutting efficiency and surface finish
• Application: slot milling in free‑machining steel and copper/copper alloys
• Standard length: Dormer standard‑length slot drill ready for everyday use

The combination of a cobalt‑based HSS‑E core and a 2‑flute geometry provides enhanced hot hardness and long tool life in demanding milling scenarios. The flatted shank reduces slippage in the collet, allowing stable, precise plunges even in narrow slots. With a generous 88 mm overall length and 48 mm neck reach, this drill delivers reliable access to mid‑depth slots while maintaining rigidity for clean, accurate cuts. Use it for crafting keyways, narrow slots, or any slotting task in steel or copper alloys where consistent dimensions and dependable performance matter.