Keo 919-000-617 Countersink 1-3/4 in 90 Degree Cobalt

Product Description

The KEO 919-000-617 is a single-flute cobalt steel countersink designed for chamfering, countersinking, and deburring operations in metal fabrication and machining environments. It features a 1-3/4 inch head diameter with a 90-degree included angle, making it well suited for producing clean, accurate seat angles in ferrous and hard materials. The cobalt steel construction provides elevated heat and wear resistance compared to standard high-speed steel tooling. The single-flute geometry reduces chatter and promotes a smooth finish in the countersunk area. Machinists and tool-and-die professionals working with drill presses, lathes, or CNC setups will find this countersink a reliable choice for production or maintenance work.

This countersink is intended for use on metal workpieces where a 90-degree chamfer angle is required, including bolt-hole preparation, rivet seat forming, and edge deburring. It is commonly used in industrial manufacturing, maintenance and repair operations, and job-shop environments. The 3/4 inch shank diameter fits standard collets, drill chucks, and machine spindles appropriate for this tool size. With an overall length of 3-1/2 inches, the tool provides adequate reach for typical countersinking depths without excessive overhang.

Key Features

• Cobalt steel construction for improved hardness and heat resistance in demanding materials
• 90-degree included angle for standard countersink and chamfer profiles
• 1-3/4 inch head diameter with 1-3/4 inch maximum cutting diameter
• Single-flute design minimizes chatter and promotes smooth surface finish
• 3/4 inch shank diameter for compatibility with standard machine toolholding
• Overall length of 3-1/2 inches for balanced reach and rigidity

Compatibility

Designed as an OEM-style single-flute countersink for use in drill presses, lathes, and CNC machining centers equipped with toolholding that accepts a 3/4 inch shank diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist or tooling technician. Secure the shank firmly in a properly rated collet or chuck before use, and confirm the machine spindle is fully stopped before changing or adjusting tooling. Use appropriate cutting fluid or coolant for the material being machined to extend tool life and maintain surface finish quality. Follow applicable shop safety procedures and machine manufacturer guidelines for speed and feed selection.