Harvey Tool 910420-C3 Back Chamfer Tool 0.135 in 5 Flute

Product Description

The HARVEY TOOL 910420-C3 is a solid carbide back chamfer tool designed to create reverse chamfers on the back side of bores, holes, and cross-drilled features without repositioning the workpiece. It carries a 0.135-inch cutter head diameter, a 0.024-inch chamfer width, and a 90-degree included angle. Five flutes provide efficient chip evacuation and a smooth finish in the cut zone. An AlTiN coating improves heat resistance and extends tool life in ferrous and hardened materials. This tool is used in CNC machining centers and manual mills by machinists working in aerospace, medical device, mold and die, and general precision machining environments.

The 910420-C3 is suited for back chamfering operations on small-diameter bores and through-holes in tight-clearance applications. The slim 0.081-inch neck diameter allows the tool to reach features with minimal wall clearance. A 3/16-inch shank diameter provides compatibility with standard collet systems. The 2-inch overall length gives adequate reach for typical back-chamfer depths encountered in production and job-shop machining. It is intended for use in materials including steel alloys, stainless steel, and other ferrous metals where AlTiN coating performance is maximized.

Key Features

• 90-degree included angle produces consistent, precise back chamfers
• 0.135-inch cutter head diameter for small-bore back chamfer work
• 5-flute geometry supports efficient chip evacuation and surface finish quality
• AlTiN coating enhances thermal resistance and wear life in ferrous materials
• 0.081-inch neck diameter allows access to tight-clearance bore features
• Solid carbide construction provides rigidity and dimensional stability

Compatibility

Designed as an OEM-style back chamfer tool for use in standard 3/16-inch collet or toolholder systems on CNC machining centers and manual milling machines.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle at a full stop and machine power locked out. Seat the 3/16-inch shank fully into a clean, properly sized collet or toolholder and torque the retention mechanism per the toolholder manufacturer's specification. Confirm runout with a dial indicator before beginning the cut. Do not exceed the recommended depth of cut or feed rate for the workpiece material and coating type.