7.4mm internal cooling 2-edge carbide step drill designed for high-precision drilling of non-ferrous metals with excellent chip evacuation performance and burr-free machining.

• Multi-diameter step hole machining for aerospace components
• Deep hole and blind hole drilling in non-ferrous fixtures and molds
• High-speed CNC drilling in non-ferrous parts with burr-free requirements

This step drill features an internal cooling design that introduces cooling fluid directly into the cutting edge area, enhancing cooling efficiency and lubrication while preventing chip accumulation and tool overheating. The straight flute structure effectively guides chips out of the hole, making it ideal for soft metals with strong chip adhesion. The step geometry allows one tool to complete multiple hole diameters while maintaining coaxial accuracy.

When selecting an internal coolant step drill, consider:

• Workpiece material: For soft metals like aluminum alloy, copper, or brass that tend to stick to cutting tools, choose internal cooling with straight groove structure
• Hole complexity: For multi-segment stepped holes or deep holes requiring high coaxiality, select customized stepped structures
• Production volume: For continuous batch processing requiring extended tool life and stability, use ultra-fine grain alloy with coating