Harvey Tool 54250 Single Profile Thread Mill 1/4-20 1/4-56

Product Description

The HARVEY TOOL 54250 is a solid carbide single profile thread mill designed to cut both internal and external threads across a wide range within the 1/4-inch thread family. With a cutting diameter of 0.18 inches and a 1/4-inch shank diameter, this tool handles thread profiles ranging from 20 to 56 TPI in a single setup. The four-flute geometry and bright uncoated finish make it well suited for precision threading operations in CNC machining centers. Machinists and tool-and-die professionals use this type of cutter where a single tool needs to span multiple thread pitches without a tool change.

This thread mill is built for shops running CNC milling equipment that require a versatile threading solution for 1/4-inch diameter threads in both internal bores and external profiles. The 2.5-inch overall length and 0.115-inch neck diameter allow access into standard bore depths while maintaining rigidity. The uncoated carbide construction is appropriate for a broad range of workpiece materials including steel, aluminum, and plastics. It is a practical choice for low-volume production, prototype work, and repair threading where a dedicated tap or die would be impractical.

Key Features

• Cuts internal and external threads - one tool handles both applications
• Thread range of 20 to 56 TPI covers all standard 1/4-inch unified thread sizes from 1/4-20 through 1/4-56
• Solid carbide construction for rigidity and wear resistance
• Four-flute design provides stable chip evacuation during helical interpolation
• Bright uncoated finish is compatible with a wide range of workpiece materials
• 0.115-inch neck diameter allows access into confined bore geometries

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for threading operations covering 1/4-inch thread sizes from 1/4-20 to 1/4-56. No specific machine model compatibility was provided by the manufacturer for this part.

Installation Notes

Thread milling requires a CNC machining center with helical interpolation capability - this tool is not used with a manual tap wrench or drill press. Confirm correct spindle speed, feed rate, and helical pitch programming before cutting; consult the tool manufacturer cutting data tables for starting parameters. Secure the workpiece firmly and verify shank runout before engaging the cut to avoid thread profile errors. Always power down and lock out the machine before changing or inspecting the tool.