Value Collection GH8791402 Counterbore 1-5/8in 5 Flute Hss

Product Description

The VALUE COLLECTION GH8791402 is a 5-flute interchangeable pilot counterbore designed for precision counter-boring operations in metal fabrication and machining environments. Built from high-speed steel with a bright, uncoated polished finish, this tool delivers clean, accurate seat cuts for fastener heads and mating surfaces. The straight shank measures 1.25 inches in diameter and 5.875 inches in length, giving secure grip in standard tool holders. Overall length is 8.125 inches, and the counterbore cutting diameter is 1.625 inches. Cutting direction is right-hand. This tool is typically installed and operated by machinists, tool-and-die technicians, and maintenance tradespeople working with drill presses, milling machines, or CNC setups.

This counterbore is suited for applications requiring enlarged, flat-bottomed recesses to seat socket head cap screws, hex bolts, or similar fasteners flush with or below a workpiece surface. The interchangeable pilot design accepts a 7/16 inch pilot shank, allowing the cutting diameter to be used across multiple workpiece configurations without replacing the full tool body. Typical use cases include structural steel fabrication, machine maintenance, and production-line metalworking where consistent counterbore geometry is required across repeated operations.

Key Features

• 1.625 inch counterbore cutting diameter for socket head and hex fastener recesses
• 5-flute geometry provides smooth, chatter-resistant cuts in ferrous and non-ferrous metals
• High-speed steel construction offers durability across a wide range of workpiece materials
• Interchangeable pilot accepts a 7/16 inch pilot shank for versatile fitment
• Straight shank at 1.25 inches diameter for use in standard drill press or mill chucks
• Bright, uncoated polished finish — no coating interference with tight tolerance bores

Compatibility

Designed for use with 7/16 inch interchangeable pilot shanks. Fits standard straight-shank tool holders and drill chucks accepting a 1.25 inch shank diameter. Verify pilot compatibility with your specific counterbore pilot set before installation.

Installation Notes

Installation and operation should be performed by a qualified machinist or maintenance technician familiar with rotating cutting tools. Secure the shank fully in a properly sized chuck or collet before use, and ensure the workpiece is firmly fixtured. Always power down and lock out the machine before changing pilots or inspecting the cutting edges. Do not exceed the recommended RPM range for the workpiece material and tool diameter — consult published speeds-and-feeds references for high-speed steel counterbores.