Keo 917-000-053 Countersink 3/8 in 120 Degree Hss Right Hand

Product Description

The KEO 917-000-053 is a single-end, three-flute countersink designed for producing clean, accurately angled seat profiles in metal workpieces. Manufactured from high-speed steel, it features a 3/8 inch head diameter and a 120 degree included angle (60 degree centerline angle), making it well suited for deburring and countersinking standard fastener recesses. The straight-cylindrical 1/4 inch shank mounts directly into standard drill chucks or collet holders without additional adapters. Right-hand cutting geometry ensures compatibility with conventional CW-rotating spindles. This tool does not include a pilot and is rated for countersinking applications only.

This countersink is used in metal fabrication, machine shops, and maintenance environments where consistent chamfer geometry is required prior to fastener installation. Its compact head diameter and standard shank size make it a practical choice for benchtop drill presses, hand drills, and CNC applications requiring light countersinking in ferrous and non-ferrous materials. Licensed machinists, millwrights, and skilled maintenance technicians are the typical users.

Key Features

• 3/8 inch head diameter for standard countersink seat profiles
• 120 degree included angle (60 degree centerline angle) matches common flat-head fastener geometry
• Three-flute design provides stable cutting and good chip evacuation
• High-speed steel construction offers durability across ferrous and non-ferrous workpieces
• Right-hand cut compatible with standard CW-rotating spindles
• Straight-cylindrical 1/4 inch shank fits standard drill chucks and collets

Compatibility

Designed as a direct-fit countersink for use in standard 1/4 inch drill chucks, collet holders, and quick-change tool systems accepting straight-cylindrical shanks.

Installation Notes

Install and remove this tool only when the spindle is fully stopped and power is isolated from the machine. Secure the shank firmly in the chuck or collet to the full grip depth before operating. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Always wear eye protection when operating rotary cutting tools.