Keo 919-000-585 Countersink 3/4 in 82 Degree Cobalt Steel

Product Description

The KEO 919-000-585 is a single-flute cobalt steel countersink designed for precision chamfering, countersinking, and deburring operations in metalworking applications. With a 3/4 inch head diameter and an 82-degree included angle, it produces clean, accurate seat profiles for flat-head fasteners and chamfered edge breaks. The 1/2 inch shank diameter fits standard drill chucks and collet holders, and the 2.625 inch overall length provides adequate reach for most bench and machine setups. Cobalt steel construction offers improved heat and wear resistance compared to standard high-speed steel, making it well suited for harder ferrous and stainless materials.

This countersink is used in machine shops, fabrication environments, and maintenance operations where consistent countersink geometry is required. It is appropriate for use in drill presses, milling machines, and hand-held power tools with a compatible 1/2 inch chuck. Typical applications include fastener seat preparation in steel plate, structural components, and sheet metal assemblies. The single-flute design reduces chatter and delivers a smoother finish on the countersink seat compared to multi-flute tools in certain materials.

Key Features

• 82-degree included angle for standard flat-head fastener seating
• 3/4 inch head diameter with 3/4 inch maximum cutting diameter
• Single-flute geometry reduces chatter and improves surface finish
• Cobalt steel construction for enhanced heat and wear resistance
• 1/2 inch shank diameter compatible with standard drill chucks and collets
• Suitable for chamfering, countersinking, and deburring operations

Compatibility

Designed for use in any drill press, milling machine, or power tool accepting a 1/2 inch round shank; suitable for chamfering and countersinking operations in ferrous metals, stainless steel, and similar hard materials.

Installation Notes

This tool is installed by a machinist or metalworking technician into a compatible 1/2 inch drill chuck or collet. Secure the shank fully and verify chuck tightness before operation. Set spindle speed appropriate to the workpiece material and tool diameter per standard machining practice. Wear appropriate eye protection and secure the workpiece before cutting.