Scientific Cutting Tools Tm 400-28H Thread Mill 1/2-28 4 Flute

Product Description

The SCIENTIFIC CUTTING TOOLS TM 400-28H is a solid carbide helical flute thread mill designed to cut 1/2-28 UNEF threads in both internal and external applications. Built from submicron-grade carbide, this tool delivers precise thread geometry with 28 teeth per inch and a 0.4-inch cutting diameter. The four right-hand helical flutes provide clean chip evacuation and consistent surface finish in a single helical pass. It is a production-grade tool suited for CNC machining centers running tight-tolerance threading operations across ferrous and non-ferrous workpiece materials.

This thread mill is applied in shops producing components that require 1/2-28 UNEF threads, a fine-pitch unified thread standard common in instrumentation, firearms components, and precision mechanical assemblies. The tool handles both internal bores and external diameters, reducing the need for multiple tooling setups. A bright, uncoated finish makes it well-suited for applications where coating interaction with the workpiece material is a concern, or where regrinding is planned after service life.

Key Features

• Cuts 1/2-28 UNEF internal and external threads in a single tool
• Submicron-grade solid carbide construction for rigidity and wear resistance
• Four right-hand helical flutes for efficient chip evacuation
• 0.4-inch cutting diameter with 1.0-inch length of cut
• Bright, uncoated finish suitable for regrinding and chemically sensitive materials
• No coolant-through design - compatible with flood or mist coolant delivery

Compatibility

Designed as an OEM-style thread milling solution for CNC machining centers capable of helical interpolation, suitable for producing 1/2-28 UNEF threads in both internal and external configurations with a minimum nominal diameter of 0.5 inches.

Installation Notes

Thread mills of this type are installed by machinists and CNC programmers in a standard end mill holder or collet chuck sized for a 0.5-inch shank. Verify spindle runout is within acceptable limits before operation, as excessive runout accelerates edge wear and degrades thread accuracy. The machine control must support helical interpolation (G02/G03 with Z-axis lead) to execute the thread milling cycle correctly. Always confirm workpiece is securely fixtured and the tool path pitch matches the 28 TPI specification before cutting.