Keo 919-000-338 Countersink 1/4 in 82 Degree 6 Flute Hss

Product Description

The KEO 919-000-338 is a single-end, 6-flute countersink designed for producing clean, accurate 82-degree countersunk holes in metal and other machinable materials. The tool features a 1/4-inch head diameter and a straight-cylindrical 1/4-inch shank, making it compatible with standard drill chucks and collet holders. Manufactured from high-speed steel (HSS), it delivers reliable cutting performance across a range of shop and production environments. The right-hand cutting direction suits the vast majority of standard drilling setups. No pilot is included, so the operator controls hole placement using the machine spindle and workpiece setup.

This countersink is used for deburring drilled holes and creating flush-seat recesses for flat-head fasteners with an 82-degree included angle, which is the standard for inch-series flat-head screws. It is well suited for machine shops, maintenance facilities, and light production work. The compact 1/4-inch head diameter makes it a practical choice for smaller fastener sizes and tighter workpiece geometry where a larger countersink body would be impractical.

Key Features

• 82-degree included angle matches the standard for inch-series flat-head fasteners
• 6-flute design reduces chatter and produces a smoother finish than fewer-flute alternatives
• High-speed steel construction provides durability across steel, aluminum, brass, and plastics
• 1/4-inch straight-cylindrical shank fits standard drill chucks and collet holders
• Right-hand cut for use with conventional clockwise-rotation machine spindles
• Single-end, no-pilot configuration for straightforward operator-guided positioning

Compatibility

Designed as an OEM-style countersink for use in standard drill presses, CNC machining centers, and hand-held drill applications requiring an 82-degree, 1/4-inch countersink with a straight-cylindrical shank.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard toolholding equipment. Secure the shank firmly in the chuck or collet before operation and verify spindle speed is appropriate for the workpiece material and tool diameter. Always power down and de-energize the machine before changing tooling. Do not exceed the recommended RPM range for high-speed steel tooling in hard materials, as overheating will reduce tool life.