Value Collection GH8780165 Counterbore 1/4 in 3 Flute

Product Description

The VALUE COLLECTION GH8780165 is a high speed steel interchangeable pilot counterbore designed for creating flat-bottomed recesses in metal workpieces. With a 1/4-inch counterbore diameter and three cutting flutes, this tool produces clean, accurate counterbores suited to fastener seating and precision machining applications. The 1MT Morse taper shank provides secure, self-centering registration in compatible drill press and milling machine spindles. The bright, uncoated polished finish is standard for high speed steel tooling intended for general-purpose metal cutting at moderate speeds and feeds. The overall length of 3-13/16 inches accommodates typical workpiece depths encountered in production and maintenance machining.

This counterbore is intended for use in machine shop, maintenance, and fabrication environments where interchangeable pilot counterbores are required. The Morse taper shank makes it well suited to drill presses, lathes, and milling machines equipped with a No. 1 Morse taper spindle or sleeve adapter. Right-hand cutting direction is standard. The interchangeable pilot design allows the operator to swap pilot diameters to match the clearance hole being counterbored, with pilot shank compatibility at 3/32 inch. This tool is appropriate for ferrous and non-ferrous metals in both production and job-shop settings.

Key Features

• 1/4-inch counterbore diameter for precision fastener recess cutting
• 3 flutes for smooth chip evacuation and accurate seat geometry
• No. 1 Morse taper (1MT) shank for self-centering spindle fit
• High speed steel construction for general-purpose metal cutting durability
• Bright, uncoated polished finish — no additional coating to affect dimensional tolerances
• Interchangeable pilot accepts 3/32-inch pilot shank diameter
• Right-hand cutting direction for standard spindle rotation

Compatibility

Designed for use in drill press, lathe, or milling machine spindles equipped with a No. 1 Morse taper (1MT) socket or adapter sleeve. Pilot shank compatibility is 3/32 inch.

Installation Notes

This tool is installed by machinists and tool-and-die professionals using standard Morse taper seating practice — clean and de-burr the spindle socket before insertion and seat the taper firmly by hand or with a soft mallet. Ensure the machine spindle is fully stopped and de-energized before changing tooling. Secure the interchangeable pilot before beginning the cut to prevent pilot loss during operation. Use cutting fluid appropriate for the workpiece material to extend tool life and maintain surface finish quality.