Value Collection GH8791485 Counterbore 1-3/4 in 5 Flute Hss

Product Description

The VALUE COLLECTION GH8791485 is a 5-flute interchangeable pilot counterbore designed for precision seat-cutting and fastener recess work in metal fabrication and machining applications. The cutter measures 1.75 inches in diameter with an 8.125-inch overall length and a 1.25-inch straight shank. Ground from high-speed steel with a bright, uncoated finish, it delivers consistent cutting geometry for right-hand operation. The interchangeable pilot system accepts a 0.4375-inch pilot shank, allowing the body to be reused across multiple bore diameters. Machinists and tool-room technicians are the primary installers of this tool.

This counterbore is suited for use in manual mills, drill presses, and CNC machining centers where enlarged, flat-bottomed recesses are required for socket-head cap screws, bolts, and similar fasteners. It is appropriate for ferrous and non-ferrous metals in both production-floor and maintenance-repair environments. The straight shank seats directly into a collet, end-mill holder, or drill chuck without adapters.

Key Features

• 1.75-inch counterbore diameter for large-diameter fastener recesses
• 5-flute geometry provides smooth cutting action and improved chip clearance
• High-speed steel construction maintains edge retention across a range of metals
• Interchangeable pilot accepts a 0.4375-inch pilot shank for repeatable bore alignment
• Bright, uncoated finish suitable for use with cutting fluids or dry cutting
• Right-hand cutting direction compatible with standard spindle rotation

Compatibility

Designed as an OEM-style interchangeable pilot counterbore for use in standard straight-shank tool holders and collet systems accommodating a 1.25-inch shank diameter.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Secure the straight shank firmly in an appropriate collet or end-mill holder and verify runout before cutting. Always install the correct pilot shank for the pilot hole diameter before engaging the workpiece. Disengage spindle power and bring the machine to a full stop before changing pilots or removing the tool.