Keo 917-000-029 Countersink 1/4 in 120 Degree Hss 3 Flute

Product Description

The KEO 917-000-029 is a single-end high-speed steel countersink designed for producing clean, chamfered entry holes in metal workpieces. It features a 1/4 inch head diameter, a 120-degree included angle (60-degree centerline angle), and three flutes ground for right-hand cutting. The straight cylindrical shank measures 1/4 inch in diameter, allowing direct chuck mounting in standard drill presses, CNC machining centers, and hand drills. This countersink does not include a pilot and is intended for use without one, making it appropriate for operators who locate the tool by hand or fixture. Machinists and fabricators use it for deburring, chamfering, and countersunk fastener seat preparation.

This countersink is suited for general metalworking applications where a 120-degree seat angle is required. It is commonly used in machine shops, fabrication facilities, and maintenance environments for preparing countersunk screw clearance holes in steel, aluminum, brass, and similar machinable materials. The three-flute geometry provides a balance between cutting efficiency and surface finish quality. The right-hand cut direction matches standard rotating spindle direction on conventional machine tools.

Key Features

• 1/4 inch head diameter for small-diameter countersunk hole preparation
• 120-degree included angle suits common flat-head fastener seat geometries
• Three-flute design balances chip evacuation and hole finish quality
• High-speed steel construction provides hardness and wear resistance for metal cutting
• Straight cylindrical 1/4 inch shank compatible with standard drill chucks and collets
• Right-hand cut matches conventional spindle rotation on drill presses and machining centers

Compatibility

Designed as a standard single-end countersink for use in drill presses, CNC machining centers, and hand drills equipped with a chuck or collet accepting a 1/4 inch straight cylindrical shank.

Installation Notes

Installation and use should be performed by a qualified machinist or metalworker familiar with rotating cutting tool safety. Secure the workpiece firmly before operation and confirm the spindle is at a full stop before changing or adjusting the tool. Select an appropriate spindle speed for the material being cut and use cutting fluid where recommended to extend tool life. Inspect the cutting edges for wear or chipping before each use.