Keo 919-000-287 Countersink 1 in 90 Deg 3 Flute Cobalt

Product Description

The KEO 919-000-287 is a single-end cobalt steel countersink designed for deburring, chamfering, and seat preparation in metal fabrication and machining applications. It features a 90-degree included angle and a 1-inch head diameter, making it suited for standard fastener seat preparation in steel, stainless, cast iron, and other hard materials where high-speed steel tooling falls short. The straight-cylindrical shank measures 3/8 inch in diameter and seats securely in standard drill chucks or collet holders. Licensed machinists, tool-and-die technicians, and maintenance mechanics typically select cobalt-grade countersinks for demanding materials that generate significant cutting heat.

This countersink is used in general metalworking, production machining, and maintenance repair operations where a clean, accurately angled seat is required for flat-head fasteners or pipe fittings. Its right-hand cut geometry is compatible with conventional drill presses, CNC machining centers, and hand-held drilling equipment with standard right-hand rotation. The 1-inch minimum cutting diameter makes it appropriate for larger fastener seat sizes in structural and mechanical assemblies.

Key Features

• 90-degree included angle for standard flat-head fastener seat preparation
• 1-inch head diameter with 1-inch minimum cutting diameter
• 3-flute geometry for improved chip evacuation and surface finish
• Cobalt steel construction for extended tool life in hard and abrasive metals
• Straight-cylindrical shank for use in drill chucks and collet holders
• Right-hand cut, single-end design for conventional machine spindle rotation

Compatibility

Designed for use with standard drill chucks and straight-shank collet holders accepting a 3/8-inch shank diameter. Suitable for use on drill presses, CNC machining centers, and hand-held drilling equipment with right-hand rotation.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill press or CNC equipment. Secure the straight shank firmly in the chuck or collet before operation and verify spindle rotation is right-hand before engaging the workpiece. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Inspect the cutting edges for wear before each use and replace if chipping or dullness is observed.