Scientific Cutting Tools TM187-20H Thread Mill 1/4-20 Unc

Product Description

The SCIENTIFIC CUTTING TOOLS TM187-20H is a solid carbide helical flute thread mill designed to cut 1/4-20 UNC threads in both internal and external applications. Built from submicron-grade solid carbide, it delivers the rigidity and edge retention required for precision threading in ferrous and non-ferrous materials. The tool features 3 right-hand flutes with a bright, uncoated finish and a cutting diameter of 0.1870 inches. With a 0.5200-inch length of cut and a 2.5000-inch overall length, it fits standard CNC machining centers running helical interpolation routines. Machinists, toolroom operators, and CNC programmers handling production threading operations will find this tool a direct fit for tight-tolerance thread work.

This thread mill is suited for job shops, production facilities, and toolrooms where a single tool must handle both internal and external 1/4-20 UNC thread profiles. It is particularly useful in applications where tap breakage risk is a concern, such as blind holes or hard materials, or where thread diameter adjustability via CNC offset is preferred over fixed-diameter tapping. The 1/4-inch shank diameter makes it compatible with standard ER collet chucks and other common CNC tool holders used on vertical and horizontal machining centers.

Key Features

• Cuts internal and external 1/4-20 UNC threads with a single tool
• Submicron-grade solid carbide construction for high edge retention and rigidity
• 3 right-hand helical flutes for efficient chip evacuation during interpolation
• Bright, uncoated finish suitable for a wide range of workpiece materials
• 0.1870-inch cutting diameter with 0.5200-inch length of cut
• No coolant-through requirement, simplifying setup on standard machining centers

Compatibility

Designed for use on CNC machining centers capable of helical interpolation for 1/4-20 UNC thread milling in internal and external applications. Compatible with standard 1/4-inch shank tool holders including ER collet systems.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation - confirm program compatibility before use. Secure the shank fully in a balanced collet chuck or milling chuck to the manufacturer-recommended engagement depth. Verify spindle RPM and feed rate parameters against the tool manufacturer's recommendations for the specific workpiece material before initiating the cut. Handle carbide tooling with care to avoid edge chipping during setup and storage.