Value Collection GH8781569 Counterbore 1-7/8in 5 Flute 4MT Hss

Product Description

The VALUE COLLECTION GH8781569 is an interchangeable pilot counterbore designed for enlarging and finishing drilled holes to accept fastener heads and hardware seating surfaces. Built from high speed steel with a bright, uncoated finish, this tool delivers reliable cutting performance across a range of metalworking and machining applications. The 1-7/8 inch counterbore diameter and 5-flute geometry provide smooth, stable cutting action with reduced chatter. The 4MT Morse taper shank mounts securely in compatible drill press spindles and milling machine quills. Overall length of 8.125 inches accommodates deeper reach requirements. Installation and use are suited to machinists, tool and die makers, and skilled trades working in shop or production environments.

This counterbore is intended for use in machine shop, maintenance, and production drilling operations where precise counterbore depth and diameter are required. The interchangeable pilot design allows the operator to swap pilots to match different fastener shank sizes, using a 7/16 inch pilot shank diameter as specified. Right-hand cutting direction is standard for use with conventional drill press and milling spindle rotation. Typical applications include bolt hole preparation, counterboring for socket head cap screws, and seating surface finishing in steel and other machinable materials.

Key Features

• 1-7/8 inch counterbore diameter for large fastener head clearance and seating
• 5-flute design promotes smooth cutting and reduces chatter on the finish surface
• Morse taper shank (4MT) provides positive drive and secure spindle engagement
• Interchangeable pilot accepts 7/16 inch pilot shank diameter for flexible fastener compatibility
• High speed steel construction withstands heat generated during extended cutting operations
• Bright, uncoated finish suitable for use with cutting fluids and standard machining lubricants

Compatibility

Designed for use in drill press spindles and milling machine quills that accept a No. 4 Morse taper (4MT) shank. Compatible with interchangeable pilots using a 7/16 inch pilot shank diameter.

Installation Notes

This tool is installed and operated by machinists and qualified trades personnel using drill press or milling equipment. Ensure the machine spindle is fully de-energized and at a complete stop before mounting or removing the taper shank. Seat the Morse taper shank fully into the spindle using a draw bar or drift as required by the machine design. Apply appropriate cutting fluid to extend tool life and improve surface finish during counterboring operations.