Keo 919-000-551 Countersink 3/16 in 60 Deg Cobalt Steel

Product Description

The KEO 919-000-551 is a single-flute cobalt steel countersink designed for precision chamfering, countersinking, and deburring operations in metalworking and fabrication environments. With a 3/16-inch head diameter and a 60-degree included angle, this tool produces clean, accurate seat profiles for fastener heads and edge breaks on ferrous and non-ferrous materials. The cobalt steel construction provides elevated heat resistance and cutting hardness compared to standard high-speed steel, making it a reliable choice for harder alloys and production use. Weighing only 0.01 pounds, the tool is compact and well-suited for use in handheld drill motors or drill press setups.

This countersink is intended for use in machine shops, maintenance facilities, and light manufacturing settings where precise countersinking and chamfering of small-diameter holes is required. The 3/16-inch shank diameter allows direct chuck mounting in standard drill equipment without additional toolholders. The 1-3/8-inch overall length keeps the tool rigid and minimizes deflection during cutting, which is especially important when working at low feed rates on tight-tolerance applications. Machinists, toolmakers, and maintenance technicians are the primary users of this type of tool.

Key Features

• 60-degree included angle for standard fastener seat and chamfer profiles
• Single-flute design reduces cutting forces and chatter on small-diameter work
• Cobalt steel construction for improved hardness and heat resistance over standard HSS
• 3/16-inch shank diameter for direct chuck mounting in common drill equipment
• Compact 1-3/8-inch overall length minimizes deflection and improves rigidity
• Suitable for chamfering, countersinking, and deburring in one tool

Compatibility

Designed as a standard single-flute countersink for use with handheld drill motors, drill presses, and CNC drilling equipment accepting a 3/16-inch round shank.

Installation Notes

Installation and use should be performed by machinists or trained maintenance technicians familiar with rotating cutting tools. Secure the shank fully in the chuck before operation and verify chuck key removal before starting the spindle. Use appropriate cutting fluid for harder materials to extend tool life. Always wear eye protection when operating countersinks and deburring tools.