Scientific Cutting Tools TMLR139-24ELA Thread Mill 10-24

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR139-24ELA is a helical flute thread mill designed for cutting internal UNC threads to a 10-24 specification. Built from submicron-grade solid carbide and finished with an AlTiN+ coating, this tool delivers hardness and heat resistance suited for demanding machining environments. It features 3 right-hand flutes, a 0.1390-inch cutting diameter, and a 0.6000-inch length of cut, making it a long-reach option for threading operations where standard-length tools cannot reach. Machinists and tool-and-die professionals install this type of cutter on CNC machining centers to interpolate threads in a single helical pass.

This thread mill is suited for internal UNC thread milling applications on CNC machining centers in both job shop and production environments. The long-reach configuration allows access to recessed bores or deep-pocket features where a standard-reach thread mill would be unable to engage the full thread depth. The 1/4-inch shank diameter accepts standard ER or precision collet toolholders commonly found in vertical and horizontal machining centers. The 2.5-inch overall length provides the necessary projection for these setups without compromising rigidity when used at appropriate cutting parameters.

Key Features

• Submicron-grade solid carbide construction for extended tool life in ferrous and non-ferrous materials
• AlTiN+ coating provides elevated heat resistance and reduced tool wear at higher cutting speeds
• 3 right-hand helical flutes for smooth chip evacuation during thread interpolation
• Long-reach design with 0.6000-inch length of cut for deep-pocket and recessed-bore applications
• Cuts internal UNC 10-24 threads at 24 TPI in a single helical interpolation pass
• 1/4-inch shank diameter fits standard collet toolholders on CNC machining centers

Compatibility

Designed as an OEM-style thread milling solution for internal UNC 10-24 threading operations on CNC machining centers using standard 1/4-inch collet or ER toolholding systems.

Installation Notes

Installation and operation of this thread mill should be performed by a qualified machinist familiar with CNC thread interpolation cycles. Verify that the machine spindle and toolholder are clean and within runout tolerance before mounting the cutter, as excessive runout will accelerate flute wear and compromise thread quality. Power down and lock out the machine before changing tooling. Follow the CNC control manufacturer guidelines for helical interpolation programming to achieve correct thread pitch and form.