Harvey Tool 71030-C3 Helical Flute Thread Mill 8-32 8-36

Product Description

The HARVEY TOOL 71030-C3 is a solid carbide helical flute thread mill designed for cutting both internal and external UN-standard threads in the 8-32 and 8-36 thread families. With a 0.1200-inch cutting diameter, a 1/4-inch shank diameter, and a 4-flute geometry, this tool generates accurate helical thread profiles in a single pass. The AlTiN coating adds heat resistance and extends tool life in ferrous and difficult-to-machine materials. Overall length is 2.5 inches, and the neck diameter measures 0.0700 inches for reach into tighter bores. This tool is used by machinists and toolroom professionals in CNC milling applications.

This thread mill is suited for job shop and production environments where both 8-32 and 8-36 UN threads are required in a single tool. Because it handles internal and external threading, it reduces tooling inventory on jobs calling for both thread types. The small cutting diameter and extended neck make it appropriate for threading miniature and small-diameter features in materials ranging from aluminum to hardened steels. AlTiN coating performance makes it particularly effective in dry or minimal-quantity lubrication (MQL) machining setups.

Key Features

• Cuts both 8-32 and 8-36 UN threads — internal and external — with a single tool
• Solid carbide construction for rigidity and dimensional stability in small-diameter thread milling
• AlTiN coating provides elevated heat resistance and extended tool life in ferrous alloys and harder workpiece materials
• 4-flute helical geometry supports chip evacuation and consistent thread form
• 0.0700-inch neck diameter allows reach into restricted bore geometries
• 1/4-inch shank diameter fits standard ER and end-mill-style collet toolholders

Compatibility

Designed for CNC milling machines equipped with standard 1/4-inch collet or end-mill toolholding systems capable of helical interpolation; compatible with UN thread standard applications requiring 32 or 36 threads per inch in the 8 thread size.

Installation Notes

Thread milling with this tool requires a CNC control capable of helical interpolation — confirm G-code support before programming. Secure the 1/4-inch shank in a precision collet holder with minimal runout to protect the 0.0700-inch neck from deflection and breakage. Set spindle speed and feed rate per the manufacturer's published speeds-and-feeds chart for the specific workpiece material and coating. Inspect the cutting edge for wear between runs; carbide micro-tools at this diameter are sensitive to re-entry in work-hardened or interrupted cuts.