Harvey Tool 938240 Back Chamfer Cutter 0.21in 90 Degree

Product Description

The HARVEY TOOL 938240 is a solid carbide back chamfer cutter designed for deburring and chamfering the reverse side of drilled or bored holes. With a cutter head diameter of 0.21 inches and a 90-degree included angle, this tool produces a 0.037-inch chamfer width in a single pass. The 5-flute geometry provides efficient chip evacuation and a smooth finish on the backside of the workpiece. At 2.5 inches overall length with a 0.13-inch neck diameter, it reaches into recessed features without interference. The bright uncoated solid carbide construction suits a range of ferrous and non-ferrous materials. Machinists and toolmakers working on precision components specify this tool where access from the face of the part is not possible.

This back chamfer cutter is suited for CNC machining centers and manual mills performing back-chamfering operations on through-holes in workpieces where front-side chamfering is impractical. Typical applications include deburring cross-holes, producing consistent back-bevels on precision bores, and breaking sharp edges on the reverse faces of plates, housings, and manifolds. The 1/4-inch shank fits standard collet systems found on vertical machining centers and high-speed spindles.

Key Features

• 0.21-inch cutter head diameter with 0.037-inch chamfer width at 90 degrees included angle
• 5-flute solid carbide construction for rigidity and edge retention
• 0.13-inch neck diameter allows reach into confined or recessed bore locations
• 1/4-inch shank diameter for compatibility with standard collet toolholders
• 2.5-inch overall length provides clearance in typical through-hole back-chamfer setups
• Bright uncoated finish suitable for use with or without cutting fluid

Compatibility

Designed for use in CNC machining centers and manual milling machines equipped with a 1/4-inch collet or toolholder accepting a 1/4-inch shank back chamfer cutter.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with rotating cutting tool safety and machine tool operation. Ensure the spindle is fully stopped and the machine is in a safe state before loading or removing the cutter from the collet. Verify runout at the cutter head with a dial indicator after toolsetting, as excessive runout will reduce chamfer width consistency and shorten tool life. Use appropriate cutting speeds and feeds for the workpiece material — do not exceed the toolholder manufacturer's rated RPM for this shank diameter.