Value Collection SC4090024 Countersink 90 Deg 3 Flute Hss

Product Description

The VALUE COLLECTION SC4090024 is a single-end countersink designed for deburring and chamfering holes in metal, wood, and composite materials. It features a 90-degree included angle and three flutes ground from high-speed steel, producing a clean, consistent countersunk seat for flat-head fasteners. The straight-cylindrical shank measures 0.25 inches in diameter, and the countersink head diameter is 0.375 inches. This tool is used without a pilot and mounts directly into a standard drill chuck or milling machine collet. Machinists, toolroom technicians, and maintenance tradespeople typically reach for this style of countersink for production and repair work alike.

This countersink suits bench drilling, CNC, or manual machining operations where a 90-degree chamfer is required ahead of flat-head machine screws or to clean up drilled hole entries. The bright, uncoated finish makes it well-suited for general-purpose applications across steel, aluminum, brass, and plastics. It is sold and packaged as a single piece, making it practical for restocking individual sizes in a shop tool inventory.

Key Features

• 90-degree included angle creates a standard chamfer seat for flat-head fasteners
• Three-flute design improves chip clearance and reduces chatter during cutting
• High-speed steel construction provides good hardness and wear resistance for general metalworking
• Bright, uncoated finish suits a wide range of workpiece materials including steel, aluminum, and plastics
• Straight-cylindrical 0.25-inch shank fits standard drill chucks and collet holders
• Single-end, no-pilot design for straightforward setup without additional tooling

Compatibility

Designed as a general-purpose countersink for use in standard drill presses, CNC machining centers, and manual milling machines accepting a straight-cylindrical shank of 0.25 inches.

Installation Notes

Secure the shank firmly in the drill chuck or collet before operation and confirm runout is within acceptable limits to avoid an out-of-round chamfer. Use appropriate cutting fluid or lubricant when countersinking steel to extend tool life. Always power down and lock out the machine before changing or inspecting tooling. Eye protection is required during all machining operations per standard shop safety practice.