Keo 919-000-009 Countersink 3/4 in 82 Deg 4 Flute Hss

Product Description

The KEO 919-000-009 is a 4-flute high-speed steel countersink designed for producing clean, accurately angled conical seats in metal workpieces. With a 3/4-inch head diameter and an 82-degree included angle, this tool cuts a standard flat-head fastener seat in one pass without a pilot. The straight-cylindrical 1/2-inch shank fits standard drill chucks and milling machine collets. Right-hand cutting geometry suits conventional clockwise spindle rotation. Licensed machinists, tool-and-die professionals, and industrial maintenance technicians are the primary users of this tool.

This countersink is suited for ferrous and non-ferrous metal applications in production machining, fabrication shops, and maintenance environments. The 82-degree included angle matches the seating angle required by most imperial flat-head machine screws and structural fasteners used in aerospace, automotive, and general manufacturing. It is intended for use in drill presses, milling machines, and hand-held power tools with a 1/2-inch chuck capacity. The single-end configuration means the tool delivers full cutting geometry at one working end.

Key Features

• 3/4-inch head diameter produces a wide, clean countersink seat in a single pass
• 82-degree included angle matches standard imperial flat-head fastener geometry
• 4-flute design provides stable cutting action and reduces chatter on entry
• High-speed steel construction offers durability across ferrous and non-ferrous workpiece materials
• 1/2-inch straight-cylindrical shank fits standard drill chucks and collets without an adapter
• No pilot required - suitable for use in pre-drilled holes of varying diameters

Compatibility

Designed as an OEM-style countersink for use in drill presses, milling machines, and power drills equipped with a 1/2-inch chuck or collet. No specific model compatibility was provided by the manufacturer for this part number.

Installation Notes

Installation is performed by machinists and maintenance technicians using standard machine shop practices. Secure the 1/2-inch shank firmly in the chuck or collet before operation, and verify the spindle is stopped and locked before changing or inspecting the tool. Run at appropriate surface footage for high-speed steel cutting tools in the workpiece material - consult standard machining data references for recommended speeds. Always wear eye protection and ensure the workpiece is clamped securely before beginning the countersinking operation.