Keo 906-000-166 Combo Drill Countersink Size 8 Hss Tin

Product Description

The KEO 906-000-166 is a combination drill and countersink designed to drill a pilot hole and cut a countersink in a single operation. Built from high-speed steel with a titanium nitride (TiN) finish, it delivers improved wear resistance and longer tool life compared to uncoated HSS. The body diameter is 3/4 inch, the drill point diameter is 5/16 inch, the drill point length is 5/16 inch, and the overall length is 3.5 inches. It features a 118-degree drill point angle and a 60-degree included angle for the countersink. Cutting direction is right hand. This tool is suited for machinists, metalworkers, and maintenance technicians working in production or repair environments.

This combo drill countersink is used in countersinking applications where flathead fasteners must sit flush with or below a workpiece surface. It is appropriate for use in metal fabrication shops, maintenance facilities, and production environments. The double end type allows the tool to be reversed and used from either end, extending useful service life. Trade size 8 designates the fastener size this countersink is matched to.

Key Features

• High-speed steel construction for durability in metal countersinking applications
• Titanium nitride (TiN) coating increases surface hardness and reduces friction
• 118-degree drill point angle for standard through-hole drilling
• 60-degree included angle matches standard flathead fastener geometry for size 8 hardware
• Double end design allows both ends to be used, extending tool life
• Right-hand cut, plain cutting edge style with non-tapered, non-insertable construction

Compatibility

Designed for use with size 8 fastener countersinking applications in high-speed steel compatible machining setups. No specific machine model compatibility was provided in the product data.

Installation Notes

This tool is installed and used by machinists and metalworkers in drill press, milling machine, or hand-drill applications. Secure the tool properly in the chuck before operation and confirm the spindle speed is appropriate for the material being worked. Inspect both cutting ends before reversing the tool to the second end. Follow standard shop safety practices including eye protection and secure workholding.