Scientific Cutting Tools SPTM240A Single Profile Thread Mill

Product Description

The SCIENTIFIC CUTTING TOOLS SPTM240A is a single profile thread mill designed for cutting both internal and external threads in the 5/16-16 to 5/16-48 range, covering 16 to 48 TPI. Built from submicron-grade solid carbide and finished with an AlTiN+ coating, this tool handles a wide thread pitch range in a single setup. The 4-flute geometry supports efficient chip evacuation and stable cutting action. With a 0.24-inch cutting diameter, a 1/4-inch shank, and a 2.5-inch overall length, it is sized for precision thread milling on CNC machining centers in job shop, aerospace, medical, and general manufacturing environments.

This thread mill is suited for machinists and tooling engineers working on parts that require tight-tolerance internal or external threads across a broad TPI range without changing tools. The compact neck diameter of 0.153 inches and 0.5-inch neck length allow access to threads in restricted bore depths. The 0.5-inch length of cut accommodates standard thread engagement lengths for 5/16-inch thread forms in both through and blind-hole applications.

Key Features

• Covers 16 to 48 TPI in a single tool, reducing tool changes on multi-pitch jobs
• AlTiN+ coating improves heat resistance and tool life in ferrous and hardened materials
• Submicron-grade solid carbide substrate for rigidity and edge retention
• 4-flute design promotes chip clearance and surface finish quality
• Cuts both internal and external thread forms without a tool swap
• Compact 0.153-inch neck diameter allows entry into confined bore geometries

Compatibility

Designed for use on CNC machining centers capable of helical interpolation; compatible with standard 1/4-inch collet and end mill holders for thread milling operations on 5/16-inch thread forms from 16 to 48 TPI.

Installation Notes

Thread milling with this tool requires a CNC control capable of helical interpolation - verify program compatibility before setup. Secure the 1/4-inch shank in a precision collet or shrink-fit holder to minimize runout, which directly affects thread quality. Power down and lock out the spindle before mounting or removing the tool. Follow the tool manufacturer feed and speed recommendations for the specific workpiece material and coating type.