Keo 902-000-044 Solid Pilot Counterbore 6mm 3 Flute

Product Description

The KEO 902-000-044 is a solid pilot counterbore designed to produce clean, flat-bottomed recesses for socket-head cap screws in metalworking and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool handles harder workpiece materials where high-speed steel would wear prematurely. It features a 6 mm counterbore diameter, a 3.2 mm standard pilot, and 3 flutes for stable chip evacuation. The 5 mm shank diameter fits standard drill press chucks and milling machine collets. With an overall length of 71 mm, it provides adequate reach for most production and maintenance machining setups. Machinists and tool-and-die technicians are the primary users of this tool.

This counterbore is sized for M3 socket-head cap screws, accepting a 3 mm fastener with the 3.2 mm pilot guiding the tool concentrically into a pre-drilled clearance hole. It is suited for use on ferrous metals, stainless steel, and other hard alloys where cobalt steel construction provides the necessary heat and wear resistance. Typical applications include manual drill press work, CNC machining center operations, and bench-top repair tasks where a recessed screw seat is required for a flush or sub-flush fastener installation.

Key Features

• Cobalt steel construction for improved wear resistance in hard and abrasive materials
• 6 mm counterbore diameter sized for M3 socket-head cap screw heads
• 3.2 mm standard pilot for concentric alignment in pre-drilled holes
• 3 flutes promote efficient chip removal and smooth cutting action
• Bright, uncoated finish - no coating buildup to affect dimensional accuracy
• 71 mm overall length with 5 mm shank for compatibility with standard toolholding

Compatibility

Designed for use with M3 socket-head cap screws. Fits standard drill press chucks and milling collets accepting a 5 mm shank diameter.

Installation Notes

A licensed machinist or qualified shop technician should set up and operate this tool. Always secure the workpiece firmly and ensure the pilot hole is drilled to the correct clearance diameter before counterboring. Run at appropriate speeds for cobalt tooling and the workpiece material - refer to the tooling manufacturer's feeds-and-speeds chart. Power down all machinery completely before changing or inspecting tooling.