Value Collection GH8790560 Counterbore 7/8 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790560 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated finish, it accepts a 1/4 inch pilot shank and features a 3/4 inch straight shank for secure chuck retention. The 7/8 inch cutting diameter and 5-3/8 inch overall length make it suited for standard counterbore depths in ferrous and non-ferrous materials. Right-hand cutting geometry provides consistent chip evacuation. This tool is typically installed by machinists, tool and die makers, and maintenance technicians working with drill presses, milling machines, or CNC equipment.

This counterbore is intended for use in shop environments where bolt-head seating, clearance holes, and recessed fastener applications are required. The interchangeable pilot design allows the pilot to be swapped for different clearance fits without replacing the body. The straight shank configuration fits standard drill chucks and collet holders commonly found in machine shops, maintenance facilities, and manufacturing operations handling medium to light-duty counterboring tasks.

Key Features

• 7/8 inch counterbore cutting diameter for standard fastener head seating
• Interchangeable pilot accepts 1/4 inch pilot shank for flexible use
• 3-flute geometry promotes smooth cutting and chip clearance
• High speed steel construction provides durability in ferrous and non-ferrous materials
• Bright, uncoated finish with polished surface for reduced friction
• Right-hand cutting direction compatible with standard spindle rotation

Compatibility

Designed as a standard interchangeable pilot counterbore compatible with drill chucks and collet holders accepting a 3/4 inch straight shank, with pilot compatibility for 1/4 inch pilot shanks.

Installation Notes

Installation and use of this counterbore is performed by machinists or maintenance technicians operating drill presses, milling machines, or CNC machining centers. Secure the straight shank firmly in a compatible chuck or collet before operation and confirm the pilot shank is properly seated before beginning the cut. Power down and de-energize the machine spindle before changing pilots or removing the tool. Follow shop safety protocols and wear appropriate PPE including eye protection when operating cutting tools.