Precision-engineered slot drill designed for reliable slot milling in free machining steel and copper alloys. The Dormer Pramet C135 20.0mm HSS-E flatted shank two-flute standard-length drill is built for tasks requiring a long reach and consistent performance, making it a trusted choice for professional workshops.

• Diameter: 20.0 mm
• Number of Flutes: 2
• Length of Cut: 38 mm
• Overall Length: 141 mm
• Reach with Neck Relief: 90.5 mm
• Shank: Weldon 20 mm
• Material: Cobalt-based HSS‑E with bright finish
• Helix Angle: 30°
• Rake Angle: 12°
• Standard: DORMER standard
• Application: Slot milling in free machining steel and copper or copper alloys

This drill combines robust cobalt-enhanced HSS-E wear resistance with a 30° helix that promotes efficient chip evacuation and smoother cutting in slot milling operations. The 12° rake angle reduces rubbing and ensures cleaner slots, while the 90.5 mm neck relief provides impressive access for deep cavities without compromising rigidity. A 20 mm Weldon shank delivers secure clamping in compatible holders, supporting steady, accurate milling at standard speeds and feeds.