Allied Machine TM27NPTF Thread Mill 27 Tpi Nptf 1/4 Shank

Product Description

The ALLIED MACHINE AND ENGINEERING TM27NPTF is a helical flute thread mill designed for cutting NPTF threads in both internal and external applications. Built from solid carbide with a TiAlN coating, this tool delivers hard-material threading performance with improved heat and wear resistance. It operates at 27 teeth per inch (TPI), features a 0.245-inch cutting diameter, and accepts a standard 0.250-inch shank. Three right-hand helical flutes support chip evacuation during the milling cycle. The 0.437-inch length of cut and 2.5-inch overall length suit compact threading tasks in tight-clearance workpieces. Machinists and tool-and-die professionals use this mill on CNC machining centers where single-point threading or tap entry is impractical.

The TM27NPTF is suited for threading NPTF pipe thread profiles in sizes 1/16 inch and 1/8 inch. Internal and external thread capability makes this a dual-purpose tool on production and repair jobs. Typical applications include hydraulic fittings, pneumatic manifolds, and fluid-system components where pressure-tight NPTF thread form accuracy is required. The solid carbide construction supports use in ferrous and non-ferrous materials where consistent thread form and finish are critical. This tool is intended for use on CNC milling platforms with helical interpolation programmed to the specific thread pitch and diameter.

Key Features

• Cuts NPTF internal and external threads in a single tool
• Solid carbide construction for rigidity and wear resistance
• TiAlN coating increases surface hardness and thermal resistance
• 3 right-hand helical flutes for efficient chip evacuation
• 27 TPI pitch covers 1/16 inch and 1/8 inch NPTF thread sizes
• No coolant-through design — suitable for external coolant delivery setups

Compatibility

Designed for CNC machining centers using helical interpolation; compatible with 1/16 inch and 1/8 inch NPTF thread forms as specified in the product data. No additional specific model or machine compatibility data was provided in the source material.

Installation Notes

Installation and operation of this thread mill should be performed by a qualified machinist familiar with CNC helical interpolation programming. Ensure the tool is secured in a precision collet or end-mill holder rated for the 0.250-inch shank diameter before initiating any cut. Verify spindle speed and feed rate parameters against the tool manufacturer guidelines for the workpiece material prior to running the program. Do not use this tool as a tap or apply axial-only feed, as the helical interpolation path is required for proper thread form generation.