Keo 906-000-311 Combo Drill Countersink 3/8 Inch Hss

Product Description

The KEO 906-000-311 is a combination drill and countersink designed to drill a pilot hole and form a countersink in a single pass. Manufactured from high-speed steel with a bright, uncoated finish, this tool is built for general-purpose metalworking and fabrication applications. It features a 118-degree drill point angle, a 60-degree included countersink angle, and a radius cutting edge style. The 3/8-inch body diameter and compact 2.5-inch overall length make it well suited for bench drill presses and hand-held drilling operations. Right-hand cutting direction is standard for conventional drill presses and CNC setups.

This combo drill countersink is used in metal fabrication shops, machine shops, and maintenance environments where countersinking for flat-head fasteners or center-drilling for lathe work is a routine task. The double end type provides extended service life by offering two usable cutting ends. It is appropriate for use in steel, aluminum, brass, and similar machinable materials. Machinists, tool and die workers, and general fabricators are the primary installers and users of this tool.

Key Features

• Combination drill and countersink completes pilot hole and countersink in one operation
• High-speed steel construction for durability across a range of machinable metals
• Bright uncoated finish suitable for standard shop cutting fluids and coolants
• Double end design extends usable tool life
• Radius cutting edge style for smooth countersink finish
• 118-degree drill point angle and 60-degree included angle for standard fastener seating

Compatibility

Designed as an OEM-style replacement or standard trade-size combo drill countersink for use in drill presses, milling machines, and lathes requiring a size 4-1/2 combination center drill and countersink.

Installation Notes

This tool is installed and used by machinists and metal fabricators following standard shop safety procedures. Secure the workpiece firmly before beginning any drilling or countersinking operation. Use appropriate cutting fluid or coolant for the material being machined to extend tool life and maintain finish quality. Inspect the cutting edges before each use and replace the tool if chipping or wear is evident.