Keo 906-000-174 Combo Drill Countersink Size 8 Cobalt

Product Description

The KEO 906-000-174 is a combination drill and countersink designed to drill and chamfer a hole in a single pass. Built from cobalt high-speed steel, this tool handles hard materials and elevated cutting temperatures better than standard M2 HSS. It features a 5/16-inch point diameter, a 60-degree included angle for the countersink geometry, and a 118-degree drill point angle. The 3/4-inch body diameter provides rigidity during use, and the bright uncoated finish suits general-purpose shop and field applications. Machinists, toolmakers, and fabricators use this tool in drill presses, CNC machines, and hand-held power drills.

This combo drill countersink is sized for a No. 8 screw thread and is suited for use in ferrous and non-ferrous metals, hard plastics, and composite materials. The right-hand cutting direction is compatible with standard chuck spindle rotation. The double-end configuration allows the tool to be flipped and used from the opposite end once one end is worn, extending service life. The 3-1/2-inch overall length fits most standard drill chucks without requiring an extension.

Key Features

• Cobalt HSS construction for cutting hardened and abrasive materials
• 60-degree included countersink angle for standard flat-head fastener seating
• 118-degree drill point angle for fast, accurate starting on metal
• Double-end design doubles usable tool life
• Right-hand cut for compatibility with standard drill rotation
• Bright uncoated finish suitable for general-purpose use without coolant interference

Compatibility

Designed as an OEM-style replacement or direct-use combo drill countersink for No. 8 screw applications requiring a 60-degree countersink chamfer in metal or hard material substrates.

Installation Notes

A licensed machinist or qualified fabricator should secure the tool firmly in a drill press or lathe chuck before use, verifying chuck runout to maintain hole accuracy. Power down all equipment completely before changing or inspecting the tool. Use appropriate cutting fluid or lubricant when working with hard ferrous materials to reduce heat buildup. Inspect both cutting ends for chipping or wear before each use.