Scientific Cutting Tools TM33518NPT Thread Mill Npt 3/8 Shank

Product Description

The SCIENTIFIC CUTTING TOOLS TM33518NPT is a straight flute thread mill designed for cutting NPT (National Pipe Taper) threads in both external and internal applications. Built from submicron-grade solid carbide, it features 4 flutes and runs at 18 teeth per inch (TPI). The 0.335-inch cutting diameter and 0.693-inch length of cut make it suited for producing 1/4-18 and 3/8-18 NPT thread forms in a single helical interpolation pass. The bright, uncoated finish provides a consistent cutting edge without added coating thickness. Machinists and tool-and-die professionals use this mill where precise pipe thread geometry and repeatability are required.

This thread mill covers 1/4-18 and 3/8-18 NPT thread sizes, making it a practical single-tool solution for shops that produce fittings, manifolds, or ported components requiring standard pipe thread connections. Its 3/8-inch shank and 3.5-inch overall length are compatible with standard collet chucks and milling tool holders found on CNC machining centers. The staggered-tooth configuration and submicron carbide substrate support performance in ferrous and non-ferrous materials where dimensional accuracy on pipe threads is critical.

Key Features

• Cuts both 1/4-18 and 3/8-18 NPT thread forms, external and internal, with one tool
• Submicron-grade solid carbide substrate for edge retention and dimensional stability
• 4 straight flutes with staggered tooth geometry for improved chip evacuation
• 18 TPI with 0.335-inch cutting diameter and 0.693-inch length of cut
• Bright uncoated finish preserves precise cutting edge geometry
• 3/8-inch shank diameter fits standard collet and end mill holders on CNC mills

Compatibility

Designed for use on CNC machining centers capable of helical interpolation, with a 3/8-inch shank suitable for standard ER and end mill collet holders. Covers 1/4-18 and 3/8-18 NPT thread specifications per the Thread Standard NPT designation provided by the manufacturer.

Installation Notes

Thread milling requires a CNC machining center with helical interpolation capability; confirm controller support before programming the toolpath. Secure the tool in a balanced, properly torqued collet holder and verify runout before cutting. Workpiece material and spindle speed selection should follow the carbide tooling parameters established in the shop's feeds-and-speeds reference or the manufacturer's application guide. Follow all machine guarding and lockout procedures before tool changes.