Value Collection GH8815268 Counterbore 13/32 in 3 Flutes

Product Description

The VALUE COLLECTION GH8815268 is a 3-flute interchangeable pilot counterbore designed for precision countersinking and seat-finishing operations in metal fabrication and machining applications. Built from cobalt steel with a bright uncoated finish, this tool delivers heat and wear resistance suited for drilling harder alloys and stainless materials. The straight shank measures 3/8 inches in diameter with a shank length of 3-1/16 inches, and the tool runs to an overall length of 4-1/16 inches. The counterbore diameter is 13/32 inches. Right-hand cutting direction is standard. Machinists and tool-and-die professionals are the primary users of this type of counterbore.

This counterbore is intended for use in manual or CNC milling and drilling setups where a recessed seat must be cut to accept fastener heads or similar hardware. The interchangeable pilot design accepts a compatible pilot with a shank diameter of 5/32 inches, allowing the cutting diameter to be used with the correct piloted guide for precise hole alignment. It is suited for shop environments handling ferrous metals, aerospace alloys, and other materials where cobalt tooling is specified over standard high-speed steel.

Key Features

• Counterbore diameter of 13/32 inches for standard recessed fastener seat cutting
• Cobalt steel construction for improved hardness and heat resistance over standard HSS
• 3-flute geometry provides a balance of cutting speed and finish quality
• Interchangeable pilot accepts 5/32 inch pilot shank diameter for guided, accurate cuts
• Bright uncoated finish with polished surface on a straight 3/8 inch shank
• Right-hand cutting direction compatible with standard spindle rotation

Compatibility

Designed for use with interchangeable pilots having a 5/32 inch shank diameter. Fits straight-shank toolholders and collet chucks accepting a 3/8 inch shank.

Installation Notes

This counterbore is installed by a machinist into a compatible straight-shank collet, drill chuck, or milling machine spindle. Ensure the machine spindle is fully stopped and locked out before changing or seating tooling. Verify pilot shank diameter compatibility before mounting to avoid runout or chatter. Speeds and feeds should be selected based on workpiece material and machine capability per standard machining references.