Value Collection GH8815128 Counterbore 3/16 in Cobalt

Product Description

The VALUE COLLECTION GH8815128 is a three-flute interchangeable pilot counterbore designed for precision enlarging and finishing of existing holes to accept socket head cap screws and similar fasteners. Built from cobalt steel with a bright, uncoated finish, this counterbore delivers reliable performance in ferrous and harder workpiece materials. It features a 3/16 inch counterbore diameter and a 15/64 inch straight shank, making it suitable for use in standard drill presses and milling machines. The 3 inch overall length and right-hand cutting direction are consistent with general machining and fabrication applications. Machinists and tool-and-die technicians are the typical users for this type of cutting tool.

This counterbore is suited for general metalworking and fabrication environments where interchangeable pilot flexibility is required. The straight shank design allows straightforward chuck mounting on drill presses, milling machines, and CNC machining centers. The cobalt construction makes it appropriate for drilling into alloy steels and other materials that generate higher cutting temperatures. It is sold individually and is intended for shop use where counterboring operations are performed on metal components requiring a clean, flat-bottomed seat.

Key Features

• 3/16 inch counterbore diameter for precision seat forming
• Cobalt steel construction for heat and wear resistance in harder materials
• Three-flute geometry provides smooth cutting and good chip evacuation
• 15/64 inch straight shank for standard chuck compatibility
• Interchangeable pilot design accepts 3/32 inch pilot shank diameter
• Bright, uncoated finish with polished flutes for reduced friction

Compatibility

Designed for use with 3/32 inch interchangeable pilots and compatible with standard straight-shank drill press and milling machine chucks. Suitable as an OEM-style replacement or direct substitute in counterboring setups requiring a 3/16 inch seat diameter.

Installation Notes

Installation and use of this counterbore should be performed by a qualified machinist following standard shop safety practices. Ensure the spindle is fully stopped and the machine is powered down before mounting or changing the tool in the chuck. Use appropriate cutting fluid or lubricant when working with alloy or hardened steels to extend tool life and maintain finish quality. Verify pilot shank compatibility before beginning the counterboring operation to prevent tool damage or workpiece injury.