Keo 906-000-306 Combo Drill Countersink Size 10 Hss Ticn

Product Description

The KEO 906-000-306 is a combination drill and countersink tool designed to drill a pilot hole and cut an 82-degree countersink in a single pass. Built from high-speed steel with a titanium carbonitride (TiCN) finish, it delivers extended wear resistance compared to uncoated HSS tooling. The body diameter measures 7/16 inches with an overall length of 2 inches, making it a compact, precise tool for metalworking and fabrication shops. It cuts in the right-hand direction with a plain cutting edge and a single end configuration. Machinists, tool-and-die workers, and trade professionals use this style of tool for fastener seat preparation in steel, aluminum, and similar materials.

This combo drill countersink is sized for No. 10 fasteners. The drill point diameter is 3.43 millimeters with a point length of 27/64 inches (10.67 millimeters). The shank length is 1 inch. The 82-degree included angle matches the standard flat-head machine screw countersink angle used in most North American fastener applications. It is suited for bench drill press, CNC, or manual mill setups where a dedicated countersink step is not practical or where minimizing tool changes improves cycle time.

Key Features

• High-speed steel construction for durability across a range of workpiece materials
• TiCN coating extends cutting edge life and reduces friction compared to uncoated HSS
• 82-degree included angle matches standard flat-head machine screw geometry
• Combination tool drills pilot hole and cuts countersink in one operation
• Right-hand cut, plain cutting edge, single-end design for straightforward setup
• Compact 2-inch overall length fits tight fixturing and short-travel spindles

Compatibility

Designed as a standard combo drill countersink for No. 10 fastener applications requiring an 82-degree countersink seat in metalworking, fabrication, and machine shop environments.

Installation Notes

This tool is installed and operated by machinists or qualified trade professionals using a drill press, mill, or CNC machine with an appropriate collet or chuck for the 7/16-inch body diameter. Secure the workpiece firmly before operation and set spindle speed according to the workpiece material and tool diameter. Inspect the cutting edge before each use and replace the tool if chipping or wear is evident to maintain countersink quality.