Scientific Cutting Tools TM.290-24 Thread Mill 3/8-24 Unf

Product Description

The SCIENTIFIC CUTTING TOOLS TM.290-24 is a straight flute thread mill designed for cutting internal 3/8-24 UNF threads in a single helical pass. Built from submicron-grade solid carbide, it delivers the rigidity and edge retention needed for precision threading in ferrous and non-ferrous materials. The tool features 4 straight flutes, a 0.290-inch cutting diameter, and a bright uncoated finish. With a 3/16-inch shank diameter of 5/16 inches and an overall length of 3.5 inches, it fits standard CNC machining center tool holders. It is intended for use by machinists and CNC operators running thread milling cycles on mills with helical interpolation capability.

This thread mill is suited for production and job-shop environments where thread milling is preferred over tapping for tight-tolerance internal threads. The 3/8-24 UNF thread form is common in aerospace, automotive, and precision mechanical assemblies. With a length of cut of 0.809 inches and 24 teeth per inch, the tool can produce threads in through-holes and blind holes where conventional taps may not be practical. It is installed in CNC machining centers by toolroom machinists and CNC programmers using standard ER or side-lock collet holders.

Key Features

• Straight flute geometry for internal 3/8-24 UNF thread milling in a single pass
• Submicron-grade solid carbide construction for superior wear resistance and edge sharpness
• 4 flutes with 24 teeth per inch for consistent thread form
• 0.290-inch cutting diameter with 0.809-inch length of cut for shallow to moderate thread depths
• Bright uncoated finish suitable for a wide range of workpiece materials
• No coolant-through design; external coolant or cutting fluid applied at the spindle

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers capable of helical interpolation, producing internal 3/8-24 UNF threads with a minimum nominal diameter of 3/8 inch.

Installation Notes

Thread mills are installed and removed by qualified machinists following standard CNC tooling procedures. The spindle must be confirmed stopped and the machine placed in an E-stop or tool-change state before handling. Secure the 5/16-inch shank in a properly sized collet or tool holder torqued to the holder manufacturer's specification. Verify the helical interpolation parameters in the CNC program match the 3/8-24 UNF thread pitch before running the cycle.