Value Collection GH8860108 Solid Pilot Counterbore Hss

Product Description

The VALUE COLLECTION GH8860108 is a solid pilot counterbore designed for creating clean, accurate counterbored holes in metal workpieces. The tool features a 0.328-inch cutting diameter and a fixed standard pilot with a 0.189-inch diameter that self-centers in a pre-drilled hole, eliminating the need for a separate pilot. Manufactured from high speed steel, it handles the cutting demands of general machining and fabrication work. With 2 flutes and a forward cutting direction, it removes material efficiently while maintaining surface finish at the bore entrance. The straight cylindrical shank measures 0.375 inches in diameter for secure chuck retention.

This counterbore is sized for use with No. 10 fillister-head screws, making it a direct fit for operators who need a properly proportioned recess for that fastener head geometry. It suits maintenance shops, machine shops, and production environments where consistent counterbore depth and diameter are required. The 2-7/8-inch overall length provides adequate reach for most standard workholding setups. At 0.06 pounds, it is light enough for frequent handling during repetitive operations.

Key Features

• 0.328-inch counterbore diameter sized for No. 10 fillister-head screws
• Fixed standard pilot at 0.189 inches for self-centering in pre-drilled holes
• High speed steel construction for durability across general machining applications
• Straight cylindrical shank at 0.375 inches diameter for reliable chuck grip
• 2-flute, forward cutting geometry for efficient material removal
• 2-7/8-inch overall length suits standard workholding setups

Compatibility

Designed as an OEM-style replacement or direct-use solid pilot counterbore compatible with No. 10 fillister-head screws, for use in drill presses, milling machines, and hand-held power tools equipped with a chuck accepting a 0.375-inch straight shank.

Installation Notes

This tool is installed by machinists and tool-and-die professionals in a drill press, mill, or compatible power tool with a chuck sized for a 0.375-inch straight cylindrical shank. Always secure the workpiece firmly before cutting and ensure the pilot seats fully in the pilot hole before applying feed pressure. Power down the machine completely before changing or inspecting the counterbore. Do not exceed the tool material and geometry rated feed and speed ranges for the workpiece material being cut.