The Dormer Pramet A242 is a 4.0 mm diameter, 10.0 mm long HSS‑E centre drill designed to create precise centre holes in shafts. Its long‑series geometry, combined with an 118° pilot and a 60° cone, delivers accurate starts and secure seating for reliable machining.

• Diameter: 4.0 mm
• Length: 10.0 mm long‑series design
• Geometry: 118° pilot with a 60° cone for clean, accurate centres
• Material: Premium HSS‑E for versatile drilling across metals
• Finish: Bright finish minimizes sticking of workpiece material to the cutting edge
• Double‑ended design: Two cutting ends extend tool life and productivity
• Applications: Ideal for creating centre holes on shafts to enable secure holding
• Materials compatibility: Suitable for steel, aluminium, and stainless steel
• Series: Long‑series centre drill for increased reach in hard‑to‑access areas

This centre drill supports efficient, accurate centering in a variety of machining tasks. The sharp 118° pilot and precise 60° cone promote clean, concentric holes, while the bright finish reduces material buildup on the cutting edge. The double‑ended design offers extended value, allowing you to swap ends as one wears. Built from premium HSS‑E, it handles multiple metals—from steel to stainless steel—making it a dependable choice for general turning, milling, and shaft centering applications where consistent alignment matters.