Scientific Cutting Tools SPTM138LA Thread Mill 24-56 Tpi

Product Description

The SCIENTIFIC CUTTING TOOLS SPTM138LA is a single profile thread mill designed for cutting internal and external threads in the 24 to 56 TPI range, covering thread sizes from 10-24 to 10-56. Built from submicron-grade solid carbide and finished with an AlTiN Plus coating, this tool delivers the wear resistance and thermal stability required for production threading in ferrous and non-ferrous materials. The 3-flute geometry balances chip evacuation with cutting stability. With a 0.138-inch cutting diameter and 0.600-inch length of cut, it is well suited for small-diameter, close-tolerance thread milling on CNC machining centers.

This tool is used in precision machining environments where a single cutter must produce multiple thread pitches without a tool change. Typical applications include threading tapped holes and external bosses on machined components in aerospace, automotive, medical device, and general manufacturing. The helical interpolation method used with single profile thread mills makes it practical for threading near-blind holes and hard-to-reach features. It is installed and operated by CNC machinists and tooling engineers running 3-axis or 5-axis vertical and horizontal machining centers.

Key Features

• Single profile design mills threads from 10-24 to 10-56 with one tool, reducing tooling inventory
• AlTiN Plus coating provides high heat resistance and extended tool life in demanding materials
• Submicron-grade solid carbide substrate for rigidity and edge retention in fine-pitch threading
• 3-flute configuration balances cutting forces and chip clearance at small diameters
• 0.075-inch neck diameter allows access in confined bore geometries
• Capable of both internal and external thread forms in a single setup

Compatibility

Designed for use on CNC machining centers capable of helical interpolation. Accepts a 3/16-inch collet or tool holder. Suitable for cutting thread sizes 10-24 through 10-56 in internal and external applications.

Installation Notes

Thread mills require a CNC control with helical interpolation capability. Always verify spindle runout and holder concentricity before threading operations, as tool deflection at small diameters directly affects thread quality. Confirm correct climb or conventional milling direction per your material and toolpath strategy. Follow the tool manufacturer and machine builder guidelines for speeds, feeds, and coolant when programming the helical interpolation cycle.