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HSS Pilot Counterbore Cutter / Step Counterbore Drill
Made of high-speed steel, sharp cutting edge, good rigidity.
Built-in pilot guide ensures accurate centering, avoids offset during countersinking.
Mainly used for machining counterbore holes to recess hex socket screws.
✅ Suitable materials: Carbon steel, aluminum alloy, copper, plastic
✅ Advantages:
• Integrated pilot design, high concentricity
• Smooth cutting, low burr
• Standard sizes match metric screw specs (M3~M24 optional)
• Straight shank, easy to install on CNC machines, drill presses
Great for machinery assembly, fixture processing, metal workshop.
This HSS pilot counterbore cutter is designed for making counterbore holes for socket head cap screws.
Integrated pilot pin keeps concentricity, clean cutting without burrs.
Widely used for carbon steel, aluminum, plastic and other metal workpieces.
Multiple sizes available, precise hole size for standard screw installation.
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