Keo 906-000-254 Combo Drill Countersink Size 16 Cobalt

Product Description

The KEO 906-000-254 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single operation. Built from cobalt high-speed steel, it handles harder workpiece materials and elevated cutting temperatures better than standard HSS tooling. The body measures 1/2 inch in diameter with a 3/16 inch drill point diameter and an overall length of 3 inches. The bell-style cutting edge produces a 60-degree included angle countersink, making it suitable for fastener seating and deburring operations in metal fabrication, aerospace, and general machining environments. It is installed and operated by machinists and tool-and-die professionals.

This combo drill countersink is used in machine shop, production, and maintenance environments where countersinking is required for flathead fastener installations or chamfering of drilled holes. The size 16 trade designation, right-hand cut direction, and double end type make it compatible with standard drill press, CNC, and lathe setups where consistent countersink geometry is critical. Its bright, uncoated finish allows visual inspection of the cutting edges without surface treatment interference.

Key Features

• Cobalt steel construction for improved heat and wear resistance over standard HSS
• Bell-style cutting edge with 60-degree included angle for precise fastener seat geometry
• Double-end tool design extends usable life
• Right-hand cut direction compatible with standard spindle rotation
• 118-degree drill point angle for positive engagement on metal workpieces
• Bright uncoated finish for easy edge inspection

Compatibility

Designed as an OEM-style replacement or standard-production combo drill countersink for use in drill presses, CNC machining centers, and lathes accepting 1/2 inch body diameter tooling.

Installation Notes

Installation is performed by machinists or qualified shop personnel. Secure the tool firmly in an appropriate collet or chuck rated for the body diameter before operating. Ensure the machine spindle is fully stopped and locked out before changing or inspecting the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain dimensional accuracy.