Iscar 5604066 Thread Mill 1/4-18 3/8-18 Nptf Solid Carbide

Product Description

The ISCAR 5604066 is a helical flute thread mill designed for cutting NPTF pipe threads in both internal and external applications. Built from solid carbide and coated with TiAlN for heat and wear resistance, this tool handles 1/4-18 and 3/8-18 NPTF thread sizes in a single tool. It runs 3 right-hand flutes with an 18 TPI cutting profile, a 0.3120-inch cutting diameter, and a 0.5800-inch length of cut. Overall length is 2.5000 inches, with a 0.3120-inch shank diameter. Licensed machinists and CNC operators use this tool in precision threading operations where tapered pipe thread forms are required.

This thread mill is suited for shops producing or servicing components that require NPTF tapered pipe thread connections, including fittings, manifolds, hydraulic blocks, and fluid system housings. It handles both internal and external thread forms, reducing the need for separate tools per application. The helical flute geometry supports smooth chip evacuation during the milling cycle. Typical installations occur in CNC machining centers using helical interpolation routines specific to thread milling operations.

Key Features

• Cuts both internal and external NPTF threads - 1/4-18 and 3/8-18 sizes
• Solid carbide construction for rigidity and extended tool life
• TiAlN coating improves heat resistance and reduces tool wear at elevated cutting speeds
• 3 right-hand helical flutes promote efficient chip evacuation
• 18 TPI, 0.3120-inch cutting diameter, 0.5800-inch length of cut
• 2.5000-inch overall length with 0.3120-inch shank diameter for standard collet or end mill holder compatibility

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; fits standard tool holders accepting a 0.3120-inch shank diameter and is sized to cut 1/4-18 and 3/8-18 NPTF thread forms.

Installation Notes

Thread milling with this tool requires a CNC control that supports helical interpolation - confirm the program is written for thread milling, not tapping. Secure the shank firmly in a collet chuck or end mill holder with minimal runout to protect the carbide cutting edges. Inspect the tool for edge damage before each use; carbide is brittle and sensitive to impact. Coolant-through is not supported on this tool, so ensure adequate external coolant or air blast is directed at the cut zone to manage chip clearing and heat.