Keo 902-000-045 Solid Pilot Counterbore 6mm 3 Flute

Product Description

The KEO 902-000-045 is a solid pilot counterbore designed to produce clean, flat-bottomed recesses for socket-head cap screws in metal workpieces. Built from cobalt steel with a bright, uncoated finish, it delivers the hardness needed for cutting ferrous and harder materials. The tool features a 6 mm counterbore diameter, a standard 3.4 mm pilot diameter for positive alignment in the clearance hole, and 3 flutes for efficient chip removal. Overall length is 71 mm with a 5 mm shank diameter. Machinists and tool-and-die professionals reach for this style of counterbore when a cap screw head must sit flush or below the workpiece surface.

This counterbore is suited for use in machine shops, manufacturing operations, and maintenance environments where M3 socket-head cap screw installations are common. The solid pilot design keeps the tool centered in the existing drilled hole, minimizing chatter and producing a concentric seat. It is sized for M3 fastener compatibility with a 3 mm fastener size compatibility rating. Applications include fixture building, jig fabrication, and general metalworking where precise counterbore geometry is required.

Key Features

• 6 mm counterbore diameter produces correctly sized recesses for M3 socket-head cap screws
• Cobalt steel construction provides heat and wear resistance for cutting harder workpiece materials
• Standard 3.4 mm solid pilot self-centers in the clearance hole for concentric, chatter-free cutting
• 3-flute geometry promotes efficient chip evacuation and smooth finish at the recess floor
• Bright, uncoated finish allows easy visual inspection of cutting edge condition
• 5 mm shank diameter compatible with standard collets and drill chucks

Compatibility

Designed for use with M3 socket-head cap screws; the 3.4 mm pilot fits the standard M3 clearance hole diameter. Verify workpiece material and existing hole diameter before installation.

Installation Notes

A licensed machinist or qualified toolroom technician should set up and operate this counterbore. Secure the workpiece firmly before engaging the cutter and run at a spindle speed appropriate for the workpiece material and cobalt steel tooling. Ensure the pilot hole is drilled to the correct clearance diameter so the pilot engages without binding. Never force the tool into an undersized hole, as this can damage the pilot and produce an off-center recess.