Cleveland C46431 Counterbore 1/2 in 3 Flute Hss

Product Description

The CLEVELAND C46431 is an interchangeable pilot counterbore designed for enlarging and finishing bolt-seat recesses in metal workpieces. Built from high-speed steel with a bright, uncoated finish, it delivers reliable performance across a broad range of ferrous and non-ferrous materials. The body measures 4.3125 inches in overall length with a 0.5 inch counterbore diameter and a 0.4375 inch straight shank. Three flutes provide efficient chip evacuation and a clean finish at the seating surface. This tool is suited for use in manual mills, drill presses, and CNC machining centers where precision counterboring is required by machinists and tool-and-die professionals.

This counterbore is appropriate for production and maintenance machining applications in industrial, aerospace, and general fabrication environments. It accepts a 0.1875 inch pilot shank for accurate hole alignment during operation. Compatible material applications include alloy tool steel, aluminum, cast iron, low-carbon steel, and medium-carbon steel, making it a versatile choice for mixed-material shops. The interchangeable pilot design allows the operator to swap pilots to match different clearance hole sizes without replacing the body.

Key Features

• 0.5 inch counterbore diameter for standard bolt-seat applications
• Three right-hand cutting flutes for efficient chip removal
• High-speed steel construction for durability across multiple material types
• Straight 0.4375 inch shank for compatibility with standard collets and chucks
• Bright, uncoated finish suitable for use with cutting fluids
• Interchangeable 0.1875 inch pilot shank for flexible hole alignment

Compatibility

Designed for use with standard interchangeable pilot counterbore systems accepting a 0.1875 inch pilot shank. Compatible material applications include alloy tool steel, aluminum, cast iron, low-carbon steel, and medium-carbon steel.

Installation Notes

Installation and use should be performed by qualified machinists familiar with rotary cutting tool safety. Secure the straight shank firmly in a collet, drill chuck, or toolholder rated for the spindle speed in use before operation. Ensure the pilot fits the existing pilot hole without excessive play before engaging the counterbore. Always follow applicable shop safety standards and machine guarding requirements when operating rotating tooling.