Scientific Cutting Tools TM330-18NPT Thread Mill Npt 4 Flutes

Product Description

The SCIENTIFIC CUTTING TOOLS TM330-18NPT is a straight flute thread mill designed to cut NPT (National Pipe Taper) threads in both external and internal applications. Built from submicron solid carbide, this tool handles 1/4-18 and 3/8-18 NPT thread sizes in a single tool body. It runs 4 flutes at 18 teeth per inch, with a 0.33-inch cutting diameter and a 0.693-inch length of cut. Overall length is 3.5 inches, and the shank diameter is 3/8 inches. Machinists and CNC programmers use this tool in machining centers for precision pipe thread production in ferrous and non-ferrous materials.

This thread mill is suited for job shops, production machining, and maintenance repair operations requiring NPT-compliant pipe threads. It covers both 1/4-18 and 3/8-18 NPT profiles, making it a versatile option when multiple pipe thread sizes appear in the same workpiece. The bright uncoated finish means it runs without a specialty coating, keeping regrinding straightforward. It is not configured for coolant-through delivery, so flood or mist coolant applied externally is standard practice on the spindle approach.

Key Features

• Cuts both 1/4-18 and 3/8-18 NPT threads - external and internal - with one tool
• Submicron solid carbide construction for rigidity and wear resistance
• 4 straight flutes at 18 TPI for consistent thread form
• 0.33-inch cutting diameter with 0.693-inch length of cut
• 3/8-inch shank diameter fits standard ER or shrink-fit toolholders
• Bright uncoated finish - reground without coating removal

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; cuts NPT threads conforming to the 1/4-18 and 3/8-18 NPT thread standard.

Installation Notes

Thread milling requires a CNC control with helical interpolation capability - confirm G-code support before setup. Secure the 3/8-inch shank in a balanced, low-runout toolholder and verify runout at the cutting diameter before the first pass. Power down the machine and follow lockout/tagout procedures when changing or inspecting the tool. Do not use this tool on manual mills; thread milling toolpaths must be programmed to the correct pitch and lead-in geometry for NPT taper profiles.