Scientific Cutting Tools SPTM138MLA Thread Mill 10-24 to 10-56

Product Description

The SCIENTIFIC CUTTING TOOLS SPTM138MLA is a single profile thread mill designed to cut both internal and external threads across a range of sizes from 10-24 to 10-56, covering 24 to 56 threads per inch (TPI). Built from submicron-grade solid carbide and finished with an AlTiN+ coating, this tool delivers hardness and heat resistance suited to production threading environments. With a 0.138-inch cutting diameter, a 3/16-inch shank, and a 2-inch overall length, it is sized for precision threading in tight spaces. It is installed and operated by machinists and CNC programmers working in metalworking and precision manufacturing shops.

This thread mill is applied in CNC machining centers where a single tool must produce multiple thread sizes in one setup, reducing tooling changeover. The 10-24 to 10-56 thread range covers common machine screw sizes used in instrument, aerospace, and general manufacturing applications. The 3-flute geometry balances chip evacuation and surface finish quality. Its ability to cut both internal and external threads makes it a versatile choice for shops threading holes and external fastener forms in the same program.

Key Features

• Single profile design mills threads from 10-24 to 10-56 with one tool
• Cuts both internal and external thread forms
• 3 flutes for balanced chip load and surface finish
• Submicron-grade solid carbide body for rigidity and wear resistance
• AlTiN+ coating for elevated heat resistance during high-speed threading
• 0.075-inch neck diameter with 0.5-inch neck length for access in confined bores

Compatibility

Designed for use in CNC machining centers with a 3/16-inch collet or tool holder, threading materials within the 10-24 to 10-56 size range at 24 to 56 TPI.

Installation Notes

Thread milling is performed by CNC machinists using helical interpolation programs; confirm CAM software is configured for the correct thread form and pitch before cutting. Ensure the spindle and tool holder are clean and that the 3/16-inch shank is fully seated and torqued to the tool holder manufacturer specification. Inspect the cutting edges before use, as carbide tooling can sustain edge damage during handling. Use appropriate cutting fluid or minimum quantity lubrication as required by the workpiece material.