Corner Radius End Mill for Steel Machining up to HRC55 | PEX Series

Technical data

Technical notes

• KERNVEX PEX Series corner radius end mill is a solid carbide milling tool designed for steel machining up to HRC55, including carbon steel, alloy steel, cast iron, ordinary mold steel, and general steel materials.
• As a corner radius end mill, this tool is mainly used for side-wall finishing, shoulder milling, step machining, profile finishing, and applications where stronger corner protection is required. Compared with a sharp square end mill, the corner radius design helps distribute cutting stress more smoothly and reduce the risk of corner chipping during steel machining.
• With ultra-fine carbide, AlTiN nano composite coating, a 6° positive rake angle, a 35° helix angle, and controlled corner radius geometry, the PEX corner radius end mill helps improve cutting stability, edge strength, and surface consistency in finishing and semi-finishing operations.
• For flat surface, slotting, and sharp corner machining, a PEX square end mill is usually more suitable. For curved surface and 3D contour finishing, a PEX ball nose end mill is a better choice.
• The PEX corner radius end mill is made from ultra-fine carbide with 10% cobalt content. This carbide substrate provides a balance of hardness, toughness, and wear resistance for carbon steel, alloy steel, cast iron, and general steel machining up to HRC55.
• For shoulder milling and side-wall finishing, stable carbide quality helps reduce edge wear, improve dimensional consistency, and support longer tool life.
• AlTiN Nano Composite Coating
• The tool uses AlTiN nano composite coating to improve wear resistance and heat resistance during steel machining. This coating helps protect the cutting edge under higher cutting temperature and continuous machining conditions.
• It is suitable for general steel machining, semi-dry machining, finishing, and semi-finishing operations where tool wear control is important.
• Corner Radius Geometry for Stronger Edge Protection
• The corner radius design helps strengthen the cutting corner compared with a sharp square end mill. It reduces stress concentration at the corner and helps lower the risk of edge chipping during side-wall machining, shoulder milling, and step finishing.
• This geometry is especially useful for:
• • Shoulder milling
• • Side-wall finishing
• • Step machining
• • Profile finishing
• • Mold part machining
• • Edge protection in steel cutting
• • Semi-finishing with improved corner strength
• Compared with a square end mill, a corner radius end mill provides better corner protection. Compared with a ball nose end mill, it gives better side-wall and shoulder control.
• 6° Positive Rake Angle and 35° Helix Angle The 6° positive rake angle helps reduce cutting resistance and supports smoother cutting in steel machining. The 35° helix angle helps improve chip evacuation, reduce vibration, and maintain stable cutting performance.
• This design helps the tool perform well in finishing and semi-finishing applications where cutting stability, surface quality, and tool life are important.
• Stable Performance for General Steel Machining The combination of ultra-fine carbide, AlTiN nano coating, positive rake angle, 35° helix angle, and reinforced corner radius design helps the PEX corner radius end mill perform reliably in HRC55 and below materials.
• Suitable materials include carbon steel, mild steel, alloy steel, cast iron, ordinary mold steel, and general steel parts.
• KERNVEX PEX corner radius end mills are suitable for general CNC machining, steel mold machining, shoulder milling, side-wall finishing, and semi-finishing applications up to HRC55.
• Suitable workpiece materials include:
• • Tool steel up to HRC55
• • Ordinary mold steel
• • General steel components
• Typical applications include mold component machining, shoulder finishing, side-wall machining, step face machining, fixture machining, automotive parts machining, and general CNC job shop production.