Keo 919-000-407 Countersink Set 7 Pc 6 Flute Hss

Product Description

The KEO 919-000-407 is a 7-piece countersink set designed for precise countersinking operations in metal, wood, and composite materials. The set spans head diameters from 0.25 inches to 1 inch, giving machinists and metalworkers a graduated range for matching common fastener head profiles. Each countersink features a 6-flute geometry and a 90-degree included angle, which reduces chatter and produces a clean, consistent finish. All cutters are made from high-speed steel with a bright, uncoated finish and are ground for right-hand cutting. The set is stored in a molded plastic case for organized tool management on the shop floor or at a job site.

This set is suited for production shops, maintenance departments, and fabrication environments where a range of countersink sizes is needed without switching between individual tools. The 90-degree included angle is standard for most imperial-fastener applications, making the set appropriate for deburring drilled holes and preparing seats for flat-head screws across a variety of workpiece materials. The straight-shank design accommodates standard drill chucks and quick-change holders found on drill presses, CNC machines, and hand-held power drills.

Key Features

• 7-piece set covers head diameters from 0.25 inches to 1 inch in graduated steps
• 6-flute design minimizes chatter and produces a smooth countersink seat
• 90-degree included angle matches standard imperial flat-head fastener profiles
• High-speed steel construction provides durability across a range of workpiece materials
• Right-hand cutting direction compatible with standard drill chucks and quick-change holders
• Bright, uncoated finish; molded plastic storage case included

Compatibility

Designed as a general-purpose countersink set compatible with standard drill chucks and quick-change shank holders accepting straight-shank tooling. Suitable for use on drill presses, CNC machines, and hand-held power drills.

Installation Notes

Secure the countersink firmly in the drill chuck or quick-change holder before operation and verify runout before cutting. Ensure the workpiece is clamped securely to prevent movement during countersinking. Apply appropriate cutting fluid when working with ferrous metals to extend tool life and improve finish quality. Inspect the cutting edges for wear or chipping before each use and replace any damaged tool from the set before continuing work.