Keo 919-000-278 Countersink 3/4 in 82 Degree Cobalt 3 Flute

Product Description

The KEO 919-000-278 is a single-end cobalt steel countersink designed for producing clean, accurate chamfers and seat angles in ferrous and hard materials. The tool features a 3/4 inch head diameter, an 82-degree included angle, and 3 flutes for efficient chip evacuation and smooth cutting action. The straight-cylindrical shank measures 3/8 inch in diameter and is compatible with standard drill chucks and collet holders. At 1.5 inches overall length and weighing 0.17 pounds, this is a compact, rigid tool suited to production and maintenance environments where consistent countersink geometry is required.

This countersink is appropriate for metalworking applications in machine shops, maintenance facilities, and industrial production settings. The 82-degree included angle matches the standard flathead machine screw seating angle commonly specified in aerospace and general-purpose fastener work. The cobalt steel construction makes it suitable for cutting stainless steel, alloy steels, and other work-hardening materials where high-speed steel tooling falls short. Licensed machinists and tool-and-die professionals are the primary installers and operators of this tool.

Key Features

• 82-degree included angle matches standard flathead machine screw geometry
• Cobalt steel construction for improved heat and wear resistance in hard materials
• 3 flutes for smooth cutting action and efficient chip removal
• 3/4 inch head diameter with 3/8 inch straight-cylindrical shank
• Single-end design with shank attachment method for straightforward chuck mounting
• Compact 1.5 inch overall length for use in tight setups

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 3/8 inch straight-cylindrical shank, suitable for bench drill presses, CNC machining centers, and hand-held drill motors used in metalworking applications.

Installation Notes

This tool is operated by machinists and maintenance technicians using standard drilling equipment. Secure the shank fully in the chuck or collet before operation and confirm the workpiece is clamped to prevent movement. Use appropriate cutting fluid for the material being machined, particularly when working with stainless or alloy steels. Inspect the cutting edges for wear before each use and replace the tool if chipping or dullness is observed.