Value Collection GH8781361 Counterbore 1-9/16in 5 Flute 4MT

Product Description

The VALUE COLLECTION GH8781361 is a 5-flute interchangeable pilot counterbore designed for precision enlarging and finishing of bolt-seat recesses in metal workpieces. Built from high speed steel with a bright, uncoated and polished finish, this counterbore delivers reliable cutting performance across a range of shop and production applications. The 1-9/16 inch cutting diameter and 4MT Morse taper shank provide secure seating in compatible taper-arbor setups. At 8-1/8 inches overall length, the tool reaches into deeper workpiece cavities without sacrificing rigidity. Right-hand cutting geometry suits standard machine spindle rotation. Machinists and tool-and-die technicians are the primary users for this type of tooling.

This counterbore is suited for use on milling machines, drill presses, and lathes equipped with a No. 4 Morse taper spindle or adapter sleeve. The interchangeable pilot design accepts a 7/16 inch pilot shank, allowing the operator to swap pilots to match different fastener clearance holes without replacing the body. Typical applications include counterboring for socket head cap screws and similar fasteners in ferrous and non-ferrous metals. This tool is intended for professional machine shop use where consistent seat depth and concentricity are required.

Key Features

• 1-9/16 inch counterbore diameter for standard bolt-seat applications
• 5-flute geometry reduces chatter and improves surface finish in the counterbored seat
• No. 4 Morse taper shank for positive, self-holding engagement in compatible spindles
• Interchangeable pilot accepts 7/16 inch pilot shank diameter
• High speed steel construction handles a broad range of workpiece materials
• Bright, uncoated and polished finish for dimensional accuracy out of the box

Compatibility

Designed for use in machine tool spindles or arbors with a No. 4 Morse taper (4MT) socket. Accepts interchangeable pilots with a 7/16 inch shank diameter.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with rotating cutting tools. Secure the Morse taper shank fully into a clean, undamaged taper socket before operation, and ensure the pilot is seated and locked before engaging the workpiece. Always de-energize and lock out the machine spindle before changing pilots or removing the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and protect surface finish.