Scientific Cutting Tools TM170-36A Thread Mill 1/4-36

Product Description

The SCIENTIFIC CUTTING TOOLS TM170-36A is a straight flute thread mill designed for cutting internal threads to a 1/4-36 UNS specification. Built from submicron-grade solid carbide and finished with an AlTiN+ coating, this tool delivers consistent thread geometry in hardened and abrasive materials. It features 3 flutes, a 0.17 inch cutting diameter, and a 0.54 inch length of cut, with a 2.5 inch overall length and a 1/4 inch shank diameter. It is intended for use by machinists and tool and die professionals working on precision threading applications in CNC machining environments.

This thread mill is suited for internal threading operations where a 1/4-36 UNS thread form is required. The straight flute geometry and solid carbide substrate make it appropriate for use in both ferrous and non-ferrous materials, particularly in applications demanding tight tolerances and fine thread pitches. At 36 teeth per inch, this tool is well-matched to fine-pitch threading tasks found in instrumentation, aerospace, and high-precision mechanical assemblies. It is intended for use in vertical or horizontal CNC machining centers with appropriate thread milling cycles.

Key Features

• 1/4-36 UNS internal thread specification at 36 TPI
• Submicron solid carbide substrate for wear resistance and dimensional stability
• AlTiN+ coating for improved heat resistance and tool life in demanding materials
• 3 straight flutes with 0.17 inch cutting diameter and 0.54 inch length of cut
• 1/4 inch shank diameter and 2.5 inch overall length for standard CNC toolholder compatibility
• No coolant-through design; suitable for external flood or mist coolant application

Compatibility

Designed for internal thread milling of 1/4-36 UNS threads with a minimum nominal bore diameter of 1/4 inch. Compatible with standard CNC toolholders accepting a 1/4 inch shank.

Installation Notes

This tool is installed and operated by machinists using CNC machining centers with helical thread milling cycles. Ensure the toolholder is clean and properly torqued before use, and verify that the programmed thread milling cycle matches the 1/4-36 UNS thread form. Inspect the cutting edges prior to each use; solid carbide tools are susceptible to chipping if dropped or improperly handled. Do not use in manual or hand-tapping applications.