Keo 906-000-164 Combo Drill Countersink Size 7 Hss

Product Description

The KEO 906-000-164 is a combination drill and countersink designed for simultaneous drilling and countersinking in a single pass. Built from high-speed steel with a titanium nitride coating, it delivers extended tool life in production and job-shop environments. The 5/8 inch body diameter accommodates a 1/4 inch drill point with a 118-degree point angle and a 90-degree included angle for the countersink. Overall length is 3-1/4 inches. This tool is sized as a number 7 trade size and is suited for machinists, maintenance technicians, and fabricators working with metal, plastics, or composite materials.

The 906-000-164 is intended for countersinking applications where a flat-head fastener seat must be formed at the same time as the pilot hole. The plain cutting edge style and right-hand cut make it compatible with standard drill press, mill, and hand-drill setups. The double end type allows the tool to be flipped when one end shows wear, extending usable life. Typical applications include sheet metal fabrication, structural assembly, and general machining where consistent countersink angles are required.

Key Features

• High-speed steel construction for durability across a range of workpiece materials
• Titanium nitride coating reduces friction and extends cutting edge life
• 118-degree drill point angle with 90-degree countersink included angle for standard flat-head fastener prep
• Double end design doubles usable tool life before replacement
• Right-hand cut for use with standard drill press and hand-drill rotation
• Plain cutting edge style for smooth, consistent countersink finish

Compatibility

Designed as an OEM-style replacement and standard trade-size number 7 combo drill countersink for use in drill presses, milling machines, and hand drills accepting a 5/8 inch body diameter tool.

Installation Notes

Installation is performed by machinists or fabricators using standard drill press, CNC mill, or hand-drill equipment. Secure the workpiece firmly before cutting to prevent movement during the combined drilling and countersinking operation. Use appropriate cutting fluid for ferrous metals to preserve the coating and cutting edge. Inspect the tool for wear before each use and rotate to the second end when the first shows degradation.