Keo 907-000-091 Combo Drill Countersink 1/4 in Hss

Product Description

The KEO 907-000-091 is a combination drill and countersink tool machined from high-speed steel and designed for production drilling and countersinking in a single pass. The tool carries a 1/4-inch body diameter with a 7/64-inch drill point diameter and a drill point length of 7/64 inches. Overall length is 4 inches, qualifying it as a long-length tool. The 118-degree drill point angle is paired with an 82-degree included angle for the countersink profile. A bright, uncoated finish is standard. Right-hand cutting direction and a plain cutting edge style make this a straightforward, general-purpose tool for machinists and fabricators working in steel, aluminum, and similar materials.

This combo drill countersink is suited for trade size 3 applications in both job-shop and production environments. The double-end style extends tool life by offering two usable ends. It is not tapered, does not use an insertable cutter head, and is not configured as an aircraft-style countersink. The tool is appropriate for countersinking fastener seats, deburring drilled holes, and preparing screw clearance holes in light to medium metalworking operations.

Key Features

• Combination drill and countersink in a single tool for one-pass operation
• High-speed steel construction for durability across common metals
• 118-degree drill point angle with 82-degree included countersink angle
• Double-end design extends usable tool life
• Long-length tool at 4 inches OAL for reach in deeper setups
• Bright uncoated finish suitable for use with cutting fluids

Compatibility

Designed as a standard trade size 3 combination drill countersink suitable for use in drill presses, lathes, and CNC machining centers accepting 1/4-inch shank tooling.

Installation Notes

This tool is installed and operated by machinists and metal fabricators using standard drill chucks or collet systems. Secure the shank firmly before operation and confirm spindle speed is appropriate for the workpiece material. Always use a cutting fluid when working with ferrous materials to extend tool life and improve finish quality. Wear appropriate eye protection and ensure the workpiece is securely clamped before engaging the spindle.