Value Collection GH8790206 Counterbore 5/16 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790206 is a 3-flute interchangeable pilot counterbore designed for creating flat-bottomed recesses around through-holes in metal workpieces. The tool accepts an interchangeable pilot via a 3/32 inch pilot shank and mounts via a straight 19/64 inch diameter shank. With an overall length of 3-13/16 inches and a shank length of 3-1/16 inches, this counterbore is built from high speed steel with a bright, uncoated finish. It cuts right-hand rotation and is sized to produce a 5/16 inch counterbore diameter. Machinists and toolroom technicians use this style of tool in drill presses, milling machines, and hand-held power setups where socket-head cap screws or similar fasteners require a recessed seat.

This counterbore is suited for general metalworking applications in both production and maintenance environments. The interchangeable pilot design allows the pilot to be swapped out independently, extending tool life and reducing overall tooling cost. It is appropriate for use in ferrous and non-ferrous materials where a 5/16 inch counterbore diameter is required. The straight shank configuration fits standard drill chucks and collet holders, making it easy to mount without specialized toolholding equipment.

Key Features

• 5/16 inch counterbore diameter for recessing socket-head and similar fastener heads
• Interchangeable pilot accepts 3/32 inch pilot shank for flexible setup
• 3-flute geometry for smooth cutting and chip evacuation in metal
• High speed steel construction provides durability across a wide range of workpiece materials
• Bright, uncoated finish suitable for general-purpose metal cutting
• Straight 19/64 inch shank fits standard drill chucks and collets

Compatibility

Designed as an OEM-style interchangeable pilot counterbore for use with 3/32 inch diameter pilots in standard straight-shank toolholding systems.

Installation Notes

This tool is installed and used by machinists and toolroom technicians. Secure the straight shank firmly in a drill chuck or collet holder before use. Ensure the interchangeable pilot is fully seated and locked before beginning the cut. Always power down the machine and secure the workpiece before changing the pilot or removing the tool from the holder.