Keo 906-000-391 Combo Drill Countersink Metric Hss

Product Description

The KEO 906-000-391 is a combination drill and countersink tool machined from high-speed steel with a bright, uncoated finish. It performs simultaneous drilling and countersinking in a single operation, reducing setup time on manual mills, drill presses, and CNC equipment. The tool features a 120-degree drill point angle and a 60-degree included angle on the countersink profile, making it suited for metric fastener preparation. The double-end design extends tool life by offering two usable cutting ends. Right-hand cut geometry is standard. Body diameter is 16 millimeters and overall length is 71 millimeters.

This combo drill countersink is intended for metalworking applications where metric countersunk fastener seats must be prepared accurately. It is commonly used in general machining, fabrication shops, and production environments where countersinking for metric flat-head screws or rivets is required. The radius cutting edge style suits applications where a smooth countersink transition is preferred. This tool is not configured for aircraft-style applications and is not a long-length variant.

Key Features

• High-speed steel construction for wear resistance across a range of workpiece materials
• Bright, uncoated finish suitable for general-purpose machining without added coating cost
• 120-degree drill point angle optimized for metric countersinking operations
• 60-degree included angle matches standard metric countersunk fastener geometry
• Double-end design provides two cutting ends, extending useful tool life
• Radius cutting edge style for a smooth, clean countersink profile

Compatibility

Designed as an OEM-style replacement or direct-use combo drill countersink for metric countersinking applications on drill presses, manual mills, and compatible CNC setups accepting standard straight-shank tooling.

Installation Notes

Installation and use of this tool should be performed by qualified machinists or toolroom personnel. Secure the shank firmly in a compatible chuck or collet before operation and verify spindle speed is appropriate for the workpiece material and tool diameter. Inspect both cutting ends for wear or damage before each use. Follow applicable shop safety procedures and machine manufacturer guidelines when operating rotating cutting tools.