Keo 902-000-034 Solid Pilot Counterbore 1.187 in 3 Flute

Product Description

The KEO 902-000-034 is a solid pilot counterbore designed for precision seat-cutting operations in metalworking and machining applications. Built from cobalt steel with a bright, uncoated finish, it delivers reliable performance in tough ferrous materials where heat resistance matters. The tool features a 1.187-inch counterbore diameter, a 0.766-inch standard pilot diameter, and a 3-flute forward-cutting geometry that produces clean, flat-bottomed counterbore seats. The straight-cylindrical shank measures 0.75 inches in diameter and the tool has an overall length of 7 inches. Machinists and tool-room technicians rely on this type of counterbore for accurately seating socket-head cap screws flush or below a workpiece surface.

This counterbore is sized specifically for 0.75-inch socket-head cap screws, making it a direct fit for common fastener clearance work on machine components, fixtures, and structural assemblies. The standard pilot configuration guides the tool concentrically in a pre-drilled clearance hole, keeping the counterbore seat concentric with the bolt hole. It is appropriate for use in both manual and CNC drill press setups where consistent seat depth and squareness are required.

Key Features

• 1.187-inch counterbore diameter sized for 0.75-inch socket-head cap screws
• 0.766-inch standard pilot diameter for concentric alignment in pre-drilled holes
• 3-flute forward-cutting design for clean, flat-bottomed seats
• Cobalt steel construction for improved heat and wear resistance
• Straight-cylindrical 0.75-inch shank for secure chuck or collet holding
• Bright, uncoated finish - no additional coating to affect critical dimensions

Compatibility

Designed for use with 0.75-inch socket-head cap screws in standard counterbore applications on ferrous and non-ferrous workpieces.

Installation Notes

A licensed machinist or tool-room technician should install and operate this counterbore in an appropriate drill press, milling machine, or CNC setup. Ensure the workpiece is securely clamped and a proper pilot hole is pre-drilled before engaging the counterbore. Verify that spindle speed is set to a value appropriate for cobalt steel tooling and the workpiece material. Inspect the pilot for wear before each use to maintain concentricity.