Keo 906-000-179 Combo Drill Countersink Size 8 Hss Tin

Product Description

The KEO 906-000-179 is a combination drill and countersink designed to drill a pilot hole and form a countersink recess in a single pass. Built from high-speed steel with a titanium nitride coating, it delivers extended wear resistance in production and maintenance drilling applications. The tool features a 3/4 inch body diameter, a 5/16 inch drill point diameter, and a 90-degree included angle countersink geometry. At 3.5 inches overall length, it fits standard drill press and hand-drill setups. Right-hand cut direction and a plain cutting edge style make it compatible with conventional drilling equipment used by machinists, fabricators, and maintenance technicians.

This combo drill countersink is suited for countersinking fastener seats in metal fabrication, sheet metal work, and general maintenance applications. The size 8 trade designation corresponds to the fastener size it is designed to prep. The double end type allows the tool to be flipped when one end dulls, extending usable tool life. It is appropriate for use in manual drill presses, benchtop drilling setups, and portable drill applications where consistent countersink depth and angle repeatability are required.

Key Features

• High-speed steel construction with titanium nitride coating for extended tool life
• 90-degree included angle for standard countersunk fastener seating
• 3/4 inch body diameter with 5/16 inch drill point diameter
• Double end type - flip to use second cutting end when first dulls
• Right-hand cut, plain cutting edge style for conventional drill compatibility
• 118-degree drill point angle for clean entry into ferrous and non-ferrous materials

Compatibility

Designed as an OEM-style replacement or direct-use combination drill countersink for size 8 fastener applications in standard drill press and portable drill setups.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill press equipment or handheld power drills. Secure the workpiece firmly before drilling to prevent movement during countersinking. Set spindle speed appropriate for the workpiece material and tool diameter before engaging the cut. Inspect both cutting ends before use and replace the tool if chipping or excessive wear is observed.