Value Collection GH8840167 Counterbore 1/4 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8840167 is a 4-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and aircraft-style applications. The body measures 0.25 inches in diameter with a matching 0.25-inch straight shank and an overall length of 2.375 inches. Constructed from high speed steel with a bright, uncoated polished finish, this counterbore delivers reliable cutting performance in ferrous and non-ferrous materials. The right-hand cutting direction and four-flute geometry produce clean, accurate seats for fastener heads. It accepts a 3/32-inch pilot shank for guided, concentric entry into pre-drilled holes.

This counterbore is suited for aerospace-style drilling setups, general metalworking, and maintenance repair applications where consistent counterbore depth and diameter are required. The interchangeable pilot design allows the operator to swap pilots for different hole sizes without replacing the body, making it efficient for production or field repair environments. It is a standard tool in the inventory of machinists, aircraft maintenance technicians, and industrial maintenance professionals working with bolted assemblies.

Key Features

• 0.25-inch counterbore diameter for standard fastener seating
• 4-flute design promotes smooth cutting and chip evacuation
• Interchangeable pilot accepts 3/32-inch pilot shank for guided entry
• High speed steel construction for durability in metal cutting
• Bright, uncoated polished finish reduces friction during operation
• Aircraft style — suited for aerospace and precision metalwork applications

Compatibility

Designed as an OEM-style interchangeable pilot counterbore for use with standard 3/32-inch pilots in aircraft-style counterboring setups.

Installation Notes

Installation is performed by machinists or maintenance technicians using a compatible drill press, milling machine, or handheld drill with adequate speed control. Secure the straight shank firmly in the tool holder before operation and confirm pilot fitment before beginning the cut. Power down all equipment before changing pilots or inspecting the cutting edges. Follow applicable shop safety standards and wear appropriate eye protection when operating cutting tools.