Meet the Dormer Pramet C122 20.0mm HSS-E plain shank two‑flute slot drill. Designed for shoulder milling and slot milling in free‑machining steel and copper alloys, it delivers dependable performance with extended reach for deep slots and pockets.

• Diameter: 20 mm
• Flutes: 2‑flute design for efficient cutting and chip evacuation
• Length of cut: 70 mm
• Overall length: 160 mm
• Reach with neck relief: 85.5 mm
• Shank: 20 mm plain shank
• Material: HSS‑E cobalt‑based for enhanced hardness and wear resistance
• Finish: Bright finish for smooth cutting and reliable performance
• Helix angle: 30°
• Rake angle: 12°
• Applications: Shoulder milling and slot milling in free machining steel and copper/copper alloys
• Standard: Dormer standard (DORMER)

This long‑series end mill is built to tackle deep slots with minimal deflection, thanks to its generous reach and rigid 20 mm shank. The 30° helix and 12° rake support efficient material removal while helping to maintain a clean shoulder and slot finish. The cobalt‑based HSS‑E composition stands up to heat and wear, extending tool life in demanding free machining steels and copper alloys. A bright finish reduces built‑up edge and aids in predictable cutting performance across multiple passes, making it a reliable choice for precision slot and shoulder milling projects.