Harvey Tool 41406-C3 Thread Mill 2-56 to 2-64 Solid Carbide

Product Description

The HARVEY TOOL 41406-C3 is a solid carbide single profile thread mill designed to cut both internal and external threads in the 2-56 to 2-64 range, covering 56 to 64 TPI. With a cutting diameter of 0.064 inches and a 0.038-inch neck diameter, this tool reaches tight thread profiles in small-diameter bores. The AlTiN coating provides heat resistance and extended tool life in ferrous and difficult-to-machine materials. Two flutes deliver efficient chip evacuation in confined cutting envelopes. Machinists and CNC tooling specialists use this tool where standard taps cannot produce reliable results in hard or exotic workpiece materials.

This thread mill is suited for precision machining operations on CNC machining centers where single-point thread milling strategy is required. It handles both internal and external thread forms in the 2-56 and 2-64 unified thread series, making it a versatile option for shops producing small fastener threads in instrument components, medical devices, and electronics assemblies. The 1/8-inch shank fits standard collet chucks common to high-speed machining setups.

Key Features

• Cuts internal and external threads from 56 to 64 TPI in the 2-56 to 2-64 range
• Solid carbide construction for rigidity and dimensional stability at high spindle speeds
• AlTiN coating improves heat resistance and wear life in ferrous and hardened materials
• 0.064-inch cutting diameter and 0.038-inch neck diameter for access to small-diameter thread forms
• 2-flute geometry supports chip clearance in confined threading passes
• 1/8-inch shank diameter compatible with standard ER and precision collet systems

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for single profile thread milling applications in the 2-56 to 2-64 unified thread range.

Installation Notes

Thread milling with this tool requires a CNC controller that supports helical interpolation; confirm program compatibility before setup. Secure the 1/8-inch shank in a precision collet chuck or toolholder with minimal runout to protect the small cutting geometry. Follow the tool manufacturer's recommended feeds, speeds, and radial engagement values for the workpiece material. Inspect the cutting edges and coating before each use, as carbide tools at this diameter are sensitive to chipping from improper handling or excessive runout.