Value Collection GH8861403 Solid Pilot Counterbore 3MT

Product Description

The VALUE COLLECTION GH8861403 is a solid pilot counterbore designed for precision hole finishing in metalworking applications. Built from high speed steel, this tool produces clean, flat-bottomed counterbored recesses for socket head fasteners and similar hardware. The 31/32 inch cutting diameter pairs with a 21/32 inch standard pilot diameter to guide the tool accurately into a pre-drilled hole. The 3-flute geometry balances chip evacuation with cutting stability. The No. 3 Morse Taper shank mounts directly into compatible drill presses, milling machines, and machining centers equipped with a 3MT spindle or sleeve.

This counterbore is suited for job shop, maintenance, and production environments where consistent counterbore depth and diameter are required for cap screw or socket head bolt installations. It is appropriate for use in steel, cast iron, aluminum, and similar machinable materials. Forward cutting direction makes it a straightforward fit for standard right-hand spindle machines. The 5/8 inch fastener size compatibility means it is commonly used to seat 5/8 inch socket head cap screws flush or below a workpiece surface.

Key Features

• 31/32 inch counterbore diameter for 5/8 inch fastener compatibility
• 21/32 inch standard pilot diameter for accurate hole alignment
• High speed steel construction for durability across a range of machinable materials
• No. 3 Morse Taper shank for secure mounting in 3MT spindles and sleeves
• 3-flute design balances chip clearing with cutting stability
• Forward cutting direction compatible with standard right-hand spindle equipment

Compatibility

Designed for use in drill presses, milling machines, and machining centers fitted with a No. 3 Morse Taper spindle or adapter sleeve. Sized for 5/8 inch fastener counterboring applications.

Installation Notes

Install the Morse Taper shank into a clean, dry 3MT spindle socket or sleeve and seat firmly by hand before applying drawbar tension where applicable. Ensure the pilot diameter matches the pre-drilled through-hole to prevent tool wander. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality. Power down and lock out the machine spindle completely before changing or inspecting the tool.