Value Collection GH8781247 Counterbore 1-3/8 in 5 Flute

Product Description

The VALUE COLLECTION GH8781247 is a 5-flute interchangeable pilot counterbore designed for precision counterboring operations in metalworking and machining environments. Built from high-speed steel with a bright, uncoated polished finish, this tool delivers clean, accurate seat geometry around pre-drilled holes. The 3MT Morse taper shank provides a secure, self-holding fit in compatible spindles and drill press quills. At 6.625 inches overall length and 1.375 inches cutting diameter, it handles medium-duty counterboring tasks with consistent results. The interchangeable pilot design allows different pilot sizes to be swapped without replacing the body, adding flexibility for varied work.

This counterbore is suited for machine shops, maintenance facilities, and production environments where bolt-head or fastener seating is required. The right-hand cutting direction is standard for conventional spindle rotation. The 3MT shank fits a wide range of drill presses, knee mills, and similar machines equipped with Morse taper spindles. It is appropriate for ferrous and non-ferrous stock where high-speed steel tooling meets the material hardness requirements. Machinists and tool-and-die technicians are the primary users of this tool in both job-shop and industrial production settings.

Key Features

• 1.375-inch counterbore diameter for precise fastener seat sizing
• 5-flute geometry provides smooth cutting action and reduced chatter
• 3MT Morse taper shank for secure self-holding fit in compatible spindles
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Bright, uncoated polished finish — no coating to affect dimensional tolerances
• Interchangeable pilot accepts 0.375-inch pilot shanks for flexible use

Compatibility

Designed for use with machines equipped with a No. 3 Morse taper spindle. Compatible with 0.375-inch interchangeable pilots. Verify spindle taper designation before installation.

Installation Notes

Installation should be performed by a qualified machinist. Power down and lock out the machine before seating or removing the Morse taper shank. Clean the spindle bore and tool taper with a clean cloth before insertion to ensure full contact and prevent runout. Secure the pilot in the counterbore body before beginning the cut, and confirm correct pilot diameter for the pre-drilled hole being counterbored.