Value Collection GH8780363 Counterbore 9/16 Inch 3 Flute

Product Description

The VALUE COLLECTION GH8780363 is a 9/16 inch interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated polished finish, this tool delivers consistent cutting performance across a range of ferrous and non-ferrous materials. The 1MT Morse taper shank provides a secure, self-holding fit in compatible drill press and milling machine spindles. With 3 right-hand cutting flutes and an overall length of 4-5/16 inches, the tool balances reach and rigidity for accurate seat formation around drilled holes.

This counterbore is suited for machine shops, maintenance facilities, and production environments where counterbored fastener seats are required. The interchangeable pilot design allows the operator to swap pilots to match different clearance hole diameters without replacing the body, making it a practical choice for shops that work across multiple fastener sizes. The 3/16 inch pilot shank diameter compatibility suits standard pilot configurations for this counterbore diameter. Licensed machinists and tool-and-die technicians are the primary installers and users of this tooling.

Key Features

• 9/16 inch counterbore diameter for precise fastener seat sizing
• 3 right-hand cutting flutes for smooth material removal and chip clearance
• 1MT Morse taper shank for secure self-holding fit in compatible spindles
• High speed steel construction for durability across a range of workpiece materials
• Bright, uncoated polished finish suitable for general-purpose machining
• Interchangeable pilot accepts 3/16 inch pilot shank for flexible setup

Compatibility

Designed for use with machines equipped with a No. 1 Morse taper (1MT) spindle socket. Compatible with standard interchangeable pilots with a 3/16 inch pilot shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists familiar with rotary cutting tools and Morse taper tooling. Ensure the machine spindle is fully de-energized and locked out before seating or removing the taper shank. Clean both the tool taper and spindle socket before insertion to ensure full contact and prevent runout. Secure the pilot firmly before operation and confirm correct rotational direction matches the right-hand cutting geometry of this tool.