Value Collection GH8840605 Pilot Counterbore 15/16 in

Product Description

The VALUE COLLECTION GH8840605 is a 4-flute interchangeable pilot counterbore designed for precision counter-boring operations in metalworking and aerospace-style applications. The tool features a 15/16-inch counterbore diameter and a 1/4-inch straight shank, machined from high speed steel for durability under demanding cutting conditions. At 3.125 inches overall length, it delivers reach and rigidity in a compact format. The bright, uncoated finish allows for easy wear inspection during service. Right-hand cutting direction is standard. This counterbore is sold individually and is well suited for use by machinists, maintenance technicians, and fabricators working on structural or aircraft-style assemblies.

This counterbore is intended for aircraft-style counter-boring applications where precise, clean seat preparation around fastener holes is required. The interchangeable pilot design accommodates a 3/16-inch pilot shank diameter, allowing the cutting head to be paired with appropriate pilot pins for accurate hole centering. Typical use cases include sheet metal fabrication, aerospace component prep, and general machine shop work where consistent counterbore depth and diameter control are critical.

Key Features

• 15/16-inch counterbore diameter for standard aircraft-style fastener seat preparation
• Interchangeable pilot accepts 3/16-inch pilot shank diameter for precise hole centering
• 4-flute geometry for smooth cutting action and improved chip evacuation
• High speed steel construction provides heat and wear resistance during cutting
• Bright, uncoated, polished finish for easy tool condition monitoring
• 1/4-inch straight shank for compatibility with standard drill press and milling machine chucks

Compatibility

Designed as an OEM-style interchangeable pilot counterbore for use in standard drill press, mill, or hand-held drilling equipment accepting a 1/4-inch straight shank. Compatible with 3/16-inch interchangeable pilot pins.

Installation Notes

Installation and use should be performed by a qualified machinist or metalworking technician. Secure the straight shank firmly in a properly sized chuck before operation, and verify the pilot pin is fully seated and locked before engaging the workpiece. Power down all equipment and allow spindles to come to a complete stop before changing or adjusting tooling. Do not exceed the recommended spindle speed for the tool diameter and material being cut.