Harvey Tool 25516 Solid Carbide Counterbore 0.25 in 4 Flute

Product Description

The HARVEY TOOL 25516 is a solid carbide counterbore designed for precision spot-facing and counterboring operations in metalworking and machining applications. Built with a 0.25 inch cutting diameter and a 0.875 inch flute length, it delivers consistent, clean-bottomed bores suited to tight-tolerance work. The uncoated carbide construction provides rigidity and wear resistance across a range of workpiece materials. With 4 flutes and a 0.25 inch shank diameter, the tool seats securely in standard collet chucks or end mill holders. It is used by machinists and tool-and-die professionals requiring repeatable counterbore geometry without the flex associated with HSS tooling.

This counterbore is suited to manual mills, CNC machining centers, and drill press setups where a flat-bottomed recess is required for fastener seating or clearance. The 4-inch overall length provides reach for applications where part geometry restricts shorter tooling. It is commonly used in job shops, production floors, and maintenance machining environments handling steel, aluminum, and similar machinable materials.

Key Features

• Solid carbide construction for rigidity and extended tool life compared to HSS alternatives
• 0.25 inch cutting diameter for standard counterbore sizing
• 4-flute geometry produces clean, flat-bottomed recesses
• 0.875 inch flute length accommodates typical fastener counterbore depths
• Uncoated finish suitable for use across a broad range of base materials
• 0.25 inch shank diameter fits standard collet and end mill holder tooling systems

Compatibility

Designed as an OEM-style solid carbide counterbore for use in standard 0.25 inch collet chucks and end mill holders on manual or CNC milling machines and drill presses.

Installation Notes

Installation should be performed by a qualified machinist familiar with rotating cutting tool setup. Ensure the machine spindle is fully stopped and locked out before securing or removing the tool from the holder. Use a calibrated collet or end mill holder sized to the 0.25 inch shank diameter and torque the retention hardware according to the toolholder manufacturer specifications. Verify runout with a dial indicator before beginning cuts to protect both the workpiece and the carbide tool.