Harvey Tool 41450 Single Profile Thread Mill 1/4-20 to 1/4-56

Product Description

The HARVEY TOOL 41450 is a solid carbide single profile thread mill designed to cut both internal and external threads in the 1/4-20 to 1/4-56 range, covering 20 to 56 threads per inch (TPI). With a cutting diameter of 0.18 inches and a 1/4-inch shank diameter, this tool mounts in standard collets and end mill holders commonly found in CNC machining centers. The 4-flute geometry and bright uncoated finish make it suitable for threading operations in a wide range of workpiece materials. Overall length is 2.5 inches, with a neck diameter of 0.115 inches and a neck length of 0.75 inches for clearance in tight bores.

This thread mill is used in CNC milling operations where a single tool must produce multiple thread sizes without a tool change. It handles both internal threads in drilled or bored holes and external threads on cylindrical features. The single-profile form allows the operator to program any pitch within the supported TPI range using helical interpolation, making it a flexible option for job shops and production environments running small batch or mixed-pitch threading operations.

Key Features

• Covers 1/4-20 to 1/4-56 thread range in a single tool (20 to 56 TPI)
• Cuts both internal and external threads via CNC helical interpolation
• 4-flute solid carbide construction for rigidity and tool life
• 0.18-inch cutting diameter with 0.115-inch neck for bore clearance
• Bright uncoated finish compatible with a broad range of materials and cutting fluids
• 2.5-inch overall length with 1/4-inch shank for standard collet chuck compatibility

Compatibility

Designed for use in CNC machining centers with standard 1/4-inch collet chucks or end mill holders capable of helical interpolation for single-profile thread milling applications.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation; confirm controller compatibility before setup. Secure the 1/4-inch shank in a collet or end mill holder with appropriate runout tolerance to maintain thread quality. Ensure the workpiece is fixtured rigidly and the spindle is at programmed speed before engaging the cut. Follow shop safety procedures for carbide tooling handling, as edges are sharp and the tool is brittle under side-load impact.