Keo 902-000-029 Solid Pilot Counterbore 0.773in 3 Flute

Product Description

The KEO 902-000-029 is a solid pilot counterbore designed for precision counterboring operations in metalworking and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers durability and heat resistance when working with harder materials. It features a 0.773 inch counterbore diameter, a 0.515 inch oversize pilot diameter, and a 3-flute configuration that promotes efficient chip evacuation and a clean, accurate bore. The straight-cylindrical shank measures 0.500 inch in diameter and fits standard toolholders. Cutting direction is forward. This tool is typically installed and used by machinists and tool-and-die professionals in production and maintenance settings.

This counterbore is sized for compatibility with 1/2 inch socket-head cap screws, making it a practical choice for creating properly recessed screw seats in machine components, fixtures, and structural assemblies. With an overall length of 6 inches, it provides the reach needed for a range of workpiece depths. It is suited for use in manual mills, CNC machining centers, and drill presses where accurate counterbore geometry is required. The oversize pilot helps maintain bore alignment during the cutting operation.

Key Features

• 0.773 inch counterbore diameter sized for 1/2 inch socket-head cap screws
• 0.515 inch oversize pilot diameter for improved bore alignment
• 3-flute design promotes efficient chip evacuation and smooth cutting action
• Cobalt steel construction provides heat and wear resistance in demanding applications
• Bright, uncoated finish - ready to run without additional coating requirements
• 6 inch overall length with 0.500 inch straight-cylindrical shank for broad toolholder compatibility

Compatibility

Designed for use with 1/2 inch socket-head cap screws. Straight-cylindrical shank diameter of 0.500 inch fits standard collet chucks and toolholders sized for 1/2 inch shanks.

Installation Notes

Installation and use of this counterbore should be performed by qualified machinists familiar with rotating cutting tools. Secure the shank firmly in the toolholder before operation and verify runout is within acceptable limits. Always power down and lock out the machine spindle before changing or adjusting tooling. Follow applicable shop safety standards and the machine manufacturer's speed and feed guidelines for cobalt steel tooling.