Harvey Tool 71050 Single Profile Thread Mill 1/4-20 to 1/4-56

Product Description

The HARVEY TOOL 71050 is a solid carbide single profile thread mill designed to cut both internal and external threads across a wide range of thread sizes from 1/4-20 to 1/4-56, covering 20 to 56 TPI in a single tool. With a cutting diameter of 0.18 inches and a 1/4-inch shank, it mounts directly into standard collets and end mill holders on CNC machining centers. The four-flute geometry provides good chip clearance and consistent thread form. The bright uncoated finish suits a broad range of workpiece materials. Overall length is 2.5 inches with a neck diameter of 0.115 inches and a neck length of 0.5 inches.

This thread mill is suited for CNC machining operations where a single tool must produce multiple thread pitches within the 1/4-inch thread size family. Typical applications include job shops, production facilities, and toolrooms that need flexibility without dedicated tap sets. It handles both through and blind hole internal threads as well as external thread milling on turned or milled parts. The tool is installed and operated by machinists and CNC programmers familiar with helical interpolation cycles.

Key Features

• Cuts internal and external threads from 20 to 56 TPI in a single tool
• Solid carbide construction for rigidity and wear resistance
• 4-flute design for efficient chip evacuation during thread milling
• 0.18-inch cutting diameter allows access to small-diameter features
• Bright uncoated finish compatible with a wide range of workpiece materials
• 0.115-inch neck diameter provides clearance in deep or confined thread locations

Compatibility

Designed for use on CNC machining centers capable of helical interpolation; compatible with standard 1/4-inch collets and end mill holders. Covers the 1/4-20 through 1/4-56 thread size range for both internal and external thread milling applications.

Installation Notes

Thread milling requires a CNC control with helical interpolation capability. Secure the tool in a balanced, properly sized 1/4-inch collet or end mill holder and verify runout before cutting. Program the correct thread helix direction and pitch for the target thread specification. Follow the tool manufacturer and machine builder guidelines for feed rate and depth of cut to avoid deflection on the slender neck diameter.