Value Collection GH8861205 Solid Pilot Counterbore Hss 2MT

Product Description

The VALUE COLLECTION GH8861205 is a solid pilot counterbore designed for precision seating of fastener heads in metal machining applications. Built from high speed steel, it delivers the hardness and wear resistance required for consistent cutting in ferrous and non-ferrous materials. The tool features a 1/2 inch counterbore diameter, an 11/32 inch pilot diameter sized for 5/16 inch fasteners, and a 3-flute cutting geometry that promotes chip clearance and smooth bore finish. The No. 2 Morse Taper shank mounts directly into compatible machine spindles for secure, concentric tool holding. This counterbore is intended for forward cutting direction and is classified as standard pilot style, not aircraft style.

This counterbore is suited for job shop, production machining, and maintenance environments where accurate counterboring of bolt or screw clearance holes is required. It is used in drill presses, milling machines, and similar machine tools equipped with a No. 2 Morse Taper spindle. Typical applications include creating flush or recessed seating surfaces for socket head cap screws, hex bolts, and similar 5/16 inch fasteners in steel, aluminum, and cast iron workpieces. Machinists, toolroom technicians, and maintenance mechanics are the primary users of this tool.

Key Features

• 1/2 inch counterbore diameter sized for standard 5/16 inch fastener head seating
• 11/32 inch integral pilot diameter provides accurate bore alignment during cutting
• High speed steel construction for hardness and wear resistance in metal cutting
• 3-flute design promotes chip evacuation and reduces cutting pressure
• No. 2 Morse Taper (2MT) shank for direct mounting in compatible spindles
• Forward cutting direction, standard pilot style, non-aircraft configuration

Compatibility

Designed for use in machine tool spindles accepting a No. 2 Morse Taper shank. Sized for counterboring operations on 5/16 inch fastener clearance holes in standard machining applications.

Installation Notes

This tool is installed by a machinist or toolroom technician into a No. 2 Morse Taper spindle on a drill press or milling machine. Ensure the machine is fully powered down and the spindle is at rest before seating or removing the taper shank. Clean the taper bore and shank contact surfaces before mounting to ensure proper seating and concentricity. Always operate at speeds appropriate for the workpiece material and tool diameter per standard machining practice.