Cleveland C46151 Countersink 1/4 in 82 Deg 3 Flute Hss

Product Description

The CLEVELAND C46151 is a single-end, straight-shank countersink designed for producing clean, accurate countersunk holes in carbon steel and cast iron. It features a 0.250-inch head diameter with an 82-degree included angle and three flutes, delivering smooth chip evacuation and a consistent seat finish. The 3/16-inch straight-cylindrical shank provides positive clamping in standard drill press and CNC machine chucks. An oxide coating improves lubricity and helps resist wear during repeated use. This tool is sized for machine shop, maintenance, and fabrication work where flush or recessed fastener seating is required.

The C46151 is suited for countersinking operations on carbon steel and cast iron workpieces in production and job-shop environments. The 82-degree included angle matches the head geometry of most imperial flat-head machine screws and is commonly used in general metalworking and structural fabrication. Its compact 1/4-inch head diameter makes it appropriate for smaller fastener sizes and tighter clearance applications. Licensed machinists, tool-and-die makers, and maintenance technicians typically reach for this style of countersink in bench drill press, knee mill, and hand-held drill driver setups.

Key Features

• 0.250-inch head diameter with 82-degree included angle for standard flat-head fastener seating
• Three flutes for efficient chip removal and smooth finish on ferrous materials
• High-speed steel construction provides hardness and toughness across a range of cutting speeds
• Oxide finish improves surface lubricity and corrosion resistance during storage and use
• 3/16-inch straight-cylindrical shank fits standard drill chucks without adapters
• Single-end design with no pilot — suitable for pre-drilled or pilot-drilled holes

Compatibility

Designed for countersinking operations in carbon steel and cast iron. Suitable for use with standard drill press, milling machine, and hand-held drill driver setups that accept a 3/16-inch straight shank.

Installation Notes

Secure the shank firmly in the drill chuck before operation and verify the spindle is stopped and locked before making any adjustments. Use appropriate cutting fluid or lubricant when countersinking ferrous materials to extend tool life and improve surface finish. Set spindle speed according to the material and tool diameter — excessive speed generates heat that reduces HSS tool life. Wear appropriate eye protection; chip ejection is a hazard with fluted rotary tools.