Value Collection GH8830648 Pilot Counterbore 1in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830648 is a 4-flute interchangeable pilot counterbore designed for precision counterboring operations in metalworking and aerospace-style applications. Built from high speed steel (HSS) with a bright, uncoated polished finish, this tool delivers clean, accurate seat geometry for fastener recessing. The 1-inch counterbore diameter and 1/2-inch straight shank make it compatible with standard drill press and milling machine setups. At 5-3/8 inches overall length, it provides adequate reach for most production and maintenance machining tasks. The right-hand cutting direction is consistent with standard machine spindle rotation.

This counterbore is suited for use in aircraft-style applications where precise fastener seating is required. It is appropriate for job shops, maintenance and repair operations, and production environments working with steel, aluminum, and other machinable metals. The interchangeable pilot design allows the pilot to be swapped to accommodate different pilot shank diameters, with this tool sized for a 3/16-inch pilot shank compatibility. It is typically used by machinists and toolroom technicians on drill presses, milling machines, or CNC equipment.

Key Features

• 1-inch counterbore diameter for standard fastener seat recessing
• 4-flute geometry for smooth, balanced cutting action
• High speed steel construction for durability in metalworking applications
• Bright, uncoated polished finish — no coating to interfere with dimensional tolerances
• Interchangeable pilot design accepts 3/16-inch pilot shank
• Aircraft style construction for precision fitment requirements

Compatibility

Designed as an OEM-style replacement and standard fit for machines accepting a 1/2-inch straight shank counterbore with interchangeable pilot; compatible with drill presses and milling setups requiring a 3/16-inch pilot shank diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with rotating cutting tools. Ensure the machine spindle is fully stopped and locked out before mounting or removing the counterbore. Secure the 1/2-inch straight shank firmly in the chuck or collet to prevent runout. Insert the correct pilot shank before operation and confirm it is seated and locked according to the tool holder manufacturer guidelines.