Value Collection GH8780520 Counterbore 13/16 in 3 Flute 2MT

Product Description

The VALUE COLLECTION GH8780520 is a 3-flute interchangeable pilot counterbore designed for precision hole finishing in metal fabrication and machining applications. The tool features a Morse Taper shank with a 2MT designation, allowing secure, self-holding mounting in compatible drill press and milling machine spindles. The counterbore diameter is 13/16 inches with an overall length of 5-3/8 inches. Constructed from high speed steel with a bright, uncoated finish, this counterbore delivers consistent cutting performance in a right-hand cutting direction. The interchangeable pilot design accepts a 1/4 inch pilot shank, making it adaptable across a range of fastener seating and bolt-hole finishing tasks.

This counterbore is suited for shop machinists, tool-and-die makers, and maintenance technicians who need to produce accurately sized counterbored holes for socket head cap screws and similar fasteners. It is appropriate for use in both manual drill press setups and knee mill operations where a Morse Taper-compatible spindle is available. The right-hand cutting direction and 3-flute geometry provide smooth chip evacuation during through-hole and blind-hole counterboring in steel, cast iron, and similar ferrous materials.

Key Features

• 13/16 inch counterbore diameter for standard socket head fastener seating
• 3-flute design promotes chip clearance and reduces chatter during cutting
• 2MT Morse Taper shank provides self-holding fit in compatible spindles
• Interchangeable pilot accepts 1/4 inch pilot shank diameter
• High speed steel construction offers durability across ferrous workpiece materials
• Bright uncoated finish allows visual wear monitoring during service life

Compatibility

Designed as an OEM-style replacement or direct-fit counterbore for drill press and milling machine spindles with a Number 2 Morse Taper (2MT) socket. Pilot compatibility requires a 1/4 inch interchangeable pilot shank.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with Morse Taper tooling. Ensure the machine spindle is fully powered down and at a complete stop before seating or removing the taper shank. Clean both the taper shank and spindle socket thoroughly to remove chips and oil before insertion to ensure full contact and runout accuracy. Use a drawbar or drift pin appropriate to the 2MT designation when securing or ejecting the tool according to the machine manufacturer's procedure.