Scientific Cutting Tools TMLR234-24ELA Thread Mill 5/16-24

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR234-24ELA is a helical flute thread mill designed for cutting internal UNF threads in precision machining applications. Built from submicron-grade solid carbide and coated with AlTiN+ for heat and wear resistance, it produces 5/16-24 threads with a cutting diameter of 0.234 inches and a length of cut of 0.85 inches. The long-reach design and 2.5-inch overall length provide clearance for deeper thread applications. Three right-hand flutes deliver smooth chip evacuation and consistent thread form. Machinists and CNC operators running tight-tolerance thread milling operations will find this tool suited to demanding production environments.

This thread mill is intended for internal thread milling on CNC machining centers capable of helical interpolation. It targets applications requiring UNF 5/16-24 threads in materials where carbide tooling and AlTiN+ coating are appropriate, such as steel, stainless steel, and hardened alloys. The long-reach geometry makes it a practical choice when thread depth or workpiece geometry limits access with standard-reach tools. The 1/4-inch shank diameter suits ER collet chucks and other small-bore toolholders commonly used in precision work.

Key Features

• Submicron-grade solid carbide construction for rigidity and extended tool life
• AlTiN+ coating provides thermal resistance and reduced tool wear in ferrous materials
• 3 right-hand helical flutes for efficient chip removal during thread milling
• Long-reach thread mill type allows access in deep or restricted bore applications
• 0.234-inch cutting diameter with 0.85-inch length of cut for 5/16-24 UNF internal threads
• No coolant-through design - suitable for external coolant delivery setups

Compatibility

Designed for internal UNF thread milling at 5/16-24, 24 TPI, with a minimum nominal diameter of 0.3125 inches. Compatible with CNC machining centers using helical interpolation and 1/4-inch shank toolholding systems such as ER collet chucks.

Installation Notes

Thread milling with this tool requires a CNC machining center programmed for helical interpolation - confirm G-code support before setup. Secure the 1/4-inch shank in a properly sized, clean collet chuck and verify runout before cutting. Use appropriate external coolant or cutting fluid for the workpiece material. Do not use this tool on manual machines or in applications that do not support CNC circular interpolation.