Scientific Cutting Tools TMLR186-20A Thread Mill 1/4-20

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR186-20A is a solid carbide helical flute thread mill designed for cutting internal 1/4-20 UNC threads. It features a 0.186-inch cutting diameter, a 0.5-inch length of cut, and a 2.5-inch overall length. The tool carries an AlTiN+ coating for enhanced heat resistance and wear performance during threading operations. With 3 right-hand flutes ground from submicron carbide, it is built for precision and tool life in demanding CNC milling applications. Licensed machinists and toolroom operators use this tool on CNC machining centers for thread milling in place of tapping.

This thread mill is suited for internal thread milling of 1/4-20 UNC threaded features in a variety of workpiece materials. The long-reach design makes it appropriate for threading operations where access depth or clearance is a consideration. It is used in production and job-shop environments on CNC vertical and horizontal machining centers. No coolant-through capability is present, so external coolant or air blast is recommended during use.

Key Features

• Cuts internal 1/4-20 UNC threads at 20 teeth per inch
• Solid carbide construction in submicron material grade for rigidity and wear resistance
• AlTiN+ coating for elevated-temperature performance and extended tool life
• 3 right-hand helical flutes for smooth chip evacuation
• Long-reach thread mill type for deeper or restricted-access threading applications
• 0.186-inch cutting diameter with 0.5-inch length of cut

Compatibility

Designed as an OEM-style thread milling tool for cutting internal 1/4-20 UNC threads on CNC machining centers equipped with helical interpolation capability.

Installation Notes

This tool is installed and operated by machinists using CNC machining centers with helical interpolation enabled in the control. Ensure the tool is properly seated and secured in a collet or end mill holder rated for the shank diameter before initiating a cut. Verify spindle speed, feed rate, and radial engagement are programmed per the toolmaker's recommendations for the workpiece material. No coolant through the tool is available, so apply external flood coolant or air blast to manage heat at the cutting zone.