Chicago-latrobe 69878 Hss Combo Drill Countersink Set 8pc

Product Description

The CHICAGO-LATROBE 69878 is an 8-piece high speed steel combination drill and countersink set covering sizes 1 through 8. Each tool combines a drill point with a countersink in a single double-end body, allowing a technician or machinist to drill a pilot hole and countersink in one step without changing tools. Body diameters range from 1/8 inch to 3/4 inch, drill point diameters run from 3/64 inch to 5/16 inch, and each countersink is ground to a 60-degree included angle. The high speed steel construction holds an edge under the heat generated by production drilling in metal, wood, and composite materials.

This set is suited for metal fabrication shops, maintenance and repair operations, electrical and mechanical contractors, and trade professionals who install fasteners flush or below the surface of a workpiece. The size range from 1 through 8 covers the most common machine screw and bolt sizes encountered in typical field and shop work. The double-end design extends tool life by providing a second usable end when one side dulls. Plain edge flutes keep chip evacuation straightforward on through-holes and blind holes alike.

Key Features

• 8-piece set covering combination drill and countersink sizes 1 through 8
• High speed steel construction for durability under drilling heat
• 60-degree included angle countersink ground on each tool
• Body diameter range: 1/8 inch to 3/4 inch
• Drill point diameter range: 3/64 inch to 5/16 inch
• Double-end design doubles usable tool life per piece
• Plain edge flute for reliable chip clearance

Compatibility

Designed as an OEM-style replacement or standard shop set compatible with any drill press, hand drill, or milling machine spindle accepting straight-shank combination drill and countersink tooling in sizes 1 through 8.

Installation Notes

Combination drill and countersink tools are typically installed and operated by machinists, tool and die workers, or trade mechanics using a drill press, CNC machine, or hand-held power drill. Secure the shank firmly in the chuck before operation and confirm the workpiece is clamped or vise-mounted to prevent rotation. Run at speeds appropriate for the workpiece material and tool diameter following standard cutting-speed tables for high speed steel. Inspect both ends for wear before use and rotate to the second end when the first shows signs of dulling.