Chicago-latrobe 78224 Spotting Drill 90 Degree 1/2 Inch

Product Description

The CHICAGO-LATROBE 78224 is a 2-flute solid carbide spotting drill designed to create accurate center points and chamfers before follow-through drilling operations. Built to a 90-degree included point angle with a 1/2-inch cutting diameter, it establishes precise drill starts that reduce walking and improve hole location accuracy. The overall length is 3.75 inches, with a 1.125-inch spiral flute length and a straight-cylindrical 1/2-inch shank. The bright, uncoated finish suits general-purpose applications across a broad range of workpiece materials. Machinists and toolroom technicians working on CNC machining centers, drill presses, and manual mills install this tool as part of a standard two-step spotting and drilling workflow.

The 78224 is suited for general-purpose spotting operations in production and job-shop environments. Its single-ended design and straight shank allow direct installation into standard drill chucks, ER collets, and hydraulic toolholders. The 90-degree point angle matches the included angle of most standard drill geometries, making it appropriate for spotting starter holes in steel, aluminum, cast iron, and similar machinable materials. The Series 790 designation places it within CHICAGO-LATROBE's line of solid carbide drilling tools intended for consistent, repeatable performance in moderate-to-high volume applications.

Key Features

• 90-degree drill point angle for accurate spotting before standard drilling operations
• Solid carbide construction provides rigidity and wear resistance compared to HSS tooling
• 2-flute spiral flute design promotes chip clearance during spotting
• Bright, uncoated finish - compatible with dry cutting and common cutting fluids
• Straight-cylindrical shank fits standard chucks, ER collets, and hydraulic holders
• Single-ended, general-purpose tool rated for a wide range of machinable workpiece materials

Compatibility

Designed as an OEM-style general-purpose spotting drill for use in CNC machining centers, knee mills, and drill presses equipped with 1/2-inch or larger capacity toolholding systems. Part of the CHICAGO-LATROBE Series 790 solid carbide drill line.

Installation Notes

Installation and tool changes should be performed with the machine spindle fully stopped and the control in an E-stop or tool-change state. Ensure the shank seating surface and toolholder bore are clean and free of chips before clamping. Spotting drills should be run at appropriate surface footage and feed rates for the workpiece material - consult the manufacturer's speeds-and-feeds data or a standard machining reference. Do not use this tool as a center drill for lathe work or as a countersink; it is designed specifically for flat-bottom spotting and chamfer initiation.