Accupro 936-50014 Thread Mill Npt Internal 4 Flute Carbide

Product Description

The ACCUPRO 936-50014 is a helical flute thread mill designed for cutting internal NPT threads in a single helical pass. Built from micrograin solid carbide and coated with TiAlN, this tool delivers sharp, consistent thread profiles in a range of ferrous and non-ferrous materials. It carries 4 flutes, a cutting diameter of 0.4950 inches, and a length of cut of 0.8750 inches. With 14 teeth per inch, it is matched to standard 1/2 inch NPT and 3/4 inch NPT internal thread forms. This tool is used by machinists and tool-and-die professionals working in CNC machining centers where thread milling is preferred over tapping.

This thread mill is suited for production and job-shop environments where NPT internal threads are required in materials such as steel, stainless, cast iron, and aluminum. The 1/2 inch shank diameter fits standard ER or shrink-fit toolholders common on vertical and horizontal machining centers. Typical applications include manifold blocks, hydraulic fittings, pipe ports, and fluid system components requiring pressure-rated NPT thread forms.

Key Features

• Micrograin solid carbide construction for rigidity and edge retention in hard materials
• TiAlN coating provides heat resistance and extended tool life in dry or minimal-quantity lubrication cutting
• 4-flute helical design generates internal NPT threads in a single interpolated pass
• 14 TPI matches standard NPT thread pitch for 1/2 inch and 3/4 inch pipe thread sizes
• 0.4950 inch cutting diameter with 0.8750 inch length of cut for full-depth NPT thread engagement
• No coolant-through requirement simplifies setup on machines without through-spindle coolant

Compatibility

Designed for cutting 1/2 inch and 3/4 inch NPT internal threads per standard NPT thread form specifications; fits 1/2 inch shank toolholders on CNC machining centers.

Installation Notes

Thread milling with this tool requires a CNC machining center capable of helical interpolation (simultaneous X, Y, and Z axis movement). Confirm correct toolholder runout before use, as excessive runout will degrade thread quality and accelerate tool wear. Follow the machine tool builder and cutting tool manufacturer guidelines for feed rate, spindle speed, and depth of cut when programming the helical interpolation cycle. Handle carbide tooling carefully to avoid chipping the cutting edges during setup and storage.