HSS Counterbore End Mill M3-M8 Pilot Slotting Countersunk Drill Bit

Achieve flush, professional-grade fastener seating with our HSS Counterbore End Mill. Engineered from high-speed steel (HSS) with an integrated pilot tip, this specialized countersink milling cutter drills flat-bottomed counterbores for screw heads ranging from M3 to M8. Whether you are working on metal fabrication, woodworking, or precision machinery assembly, this tool ensures accurate socket sinking for bolts and socket head cap screws.

Key Features

• High-speed steel (HSS) construction offers exceptional hardness, wear resistance, and thermal durability

• Integrated pilot slotting design ensures precise centering and prevents tool wandering during operation

• Flat-bottom counterbore cutting edges create clean, uniform recesses for flush screw and bolt seating

• Compatible with standard drill presses, milling machines, and power tool chucks

• Essential workshop accessory for machinists, metalworkers, woodworkers, and fabricators

Why Choose Our Counterbore End Mill Unlike standard conical countersinks that only accommodate tapered screws, this flat-bottom counterbore mill creates precise cylindrical recesses required for socket head cap screws and bolts. It offers a professional solution for clean, flush mechanical assembly.

Perfect For

• Drilling flat-bottomed counterbores for M3, M4, M5, M6, and M8 screws and bolts

• Metalworking, machine building, and fabrication projects requiring flush fastener seating

• Woodworking and custom cabinetry joinery for recessed hardware installation

• Gfitting to machinists, toolmakers, fabricators, and advanced DIYers

Enjoy precise, clean fastener recesses and professional assembly results with this HSS counterbore end mill.

Specifications

• Product Name: HSS Counterbore End Mill M3-M8 Pilot Slotting Tools Countersink Milling Cutter Countersunk Drill Flat Counterbore Drill Bit 2025

• Quantity: 1 Piece (M3-M8 Size Options)

• Core Material: High-Speed Steel (HSS)

• Application: Counterboring, Slotting, Milling, and Precision Fastener Sinking