Harvey Tool 70076 Helical Flute Thread Mill 7/16-20 Carbide

Product Description

The HARVEY TOOL 70076 is a solid carbide helical flute thread mill designed to cut 7/16-20 threads in both internal and external applications. With 4 flutes and 20 teeth per inch, it delivers consistent thread form and smooth chip evacuation in a single helical pass. The 0.3350-inch cutting diameter and 0.8750-inch length of cut make it well-suited for through and blind-hole threading operations. At 3.5000 inches overall length with a 0.3750-inch shank diameter, it mounts directly into standard collet chucks or milling holders. This tool is run by machinists and CNC operators on vertical and horizontal machining centers where tap breakage risk or thread tolerance control is a concern.

This thread mill is applied in precision machining environments where 7/16-20 UNF threads are required in materials suited to carbide cutting geometry. Both internal and external thread configurations are achievable with a single tool, reducing tooling inventory. Typical applications include aerospace, automotive, hydraulic fittings, and general machine shop work requiring fine-pitch unified threads. The bright uncoated finish is appropriate for non-ferrous metals, aluminum alloys, and certain steels where coating is not required or preferred.

Key Features

• Cuts 7/16-20 UNF threads internally and externally with one tool
• Solid carbide construction for rigidity and wear resistance
• 4-flute helical design promotes smooth chip flow and thread finish
• 20 teeth per inch for fine-pitch thread accuracy
• Bright uncoated finish suited for non-ferrous and aluminum applications
• No coolant-through requirement simplifies setup on standard machines

Compatibility

Designed for use on CNC machining centers capable of helical interpolation with a 3/8-inch collet or milling chuck. Suitable for 7/16-20 UNF internal and external thread milling operations.

Installation Notes

Thread mills require a CNC control capable of helical interpolation — confirm machine compatibility before setup. Secure the 0.3750-inch shank in a balanced collet chuck or shrink-fit holder to minimize runout and protect thread accuracy. Follow the tool manufacturer feed and speed recommendations for the workpiece material; do not exceed the rated cutting diameter or depth of cut per pass. Ensure the workpiece is fully fixtured and the spindle is at full operating speed before engaging the cut.