Harvey Tool 821470-C3 Thread Mill 1/2-12 to 1/2-32 Solid Carbide

Product Description

The HARVEY TOOL 821470-C3 is a solid carbide single profile thread mill designed for cutting internal and external threads in the 1/2-12 to 1/2-32 TPI range. With a cutting diameter of 0.388 inches and a shank diameter of 1 inch, this tool mounts in standard milling chucks and collet holders used on CNC machining centers. The AlTiN coating improves heat resistance and tool life when threading ferrous and hardened materials. Four flutes provide chip clearance and cutting stability across the full TPI range. Licensed machinists and CNC programmers specify this tool for single-pass thread milling operations where tap breakage risk must be eliminated.

This thread mill is suited for both job shop and production environments running CNC vertical or horizontal machining centers. It handles unified, metric-equivalent, and specialty thread forms within the 12 to 32 TPI range on workpieces requiring 1/2-inch nominal thread diameter. Internal threading through helical interpolation and external thread milling are both supported with the same tool, reducing changeovers. It is a practical choice for threading difficult materials including stainless steel, tool steel, and cast iron where conventional tapping is not reliable.

Key Features

• Cuts internal and external threads from 12 to 32 TPI at 1/2-inch nominal diameter
• Solid carbide construction for rigidity and extended tool life in hard materials
• AlTiN coating provides high-temperature resistance and reduced tool wear
• 4-flute geometry supports efficient chip evacuation during helical interpolation
• 0.388-inch cutting diameter with 0.25-inch neck diameter allows reach into bored features
• 1.5-inch thread depth capacity and 1.5-inch neck length for deep-thread applications

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; compatible with standard 1-inch shank tool holders including collet chucks and end mill holders.

Installation Notes

Installation is performed by qualified CNC machinists. Secure the shank fully in a balanced, runout-controlled holder before use. Confirm CNC control supports helical interpolation and that feeds, speeds, and depth-of-cut are programmed per the tool manufacturer's threading application guidelines. Inspect the cutting edges for wear or chipping before each use and do not regrind without AlTiN recoating.