Harvey Tool 70046-C3 Thread Mill 1/4-28 3 Flute Solid Carbide

Product Description

The HARVEY TOOL 70046-C3 is a solid carbide helical flute thread mill designed to cut 1/4-28 UNF threads in both internal and external applications. With 3 flutes and an AlTiN coating, it delivers efficient chip evacuation and extended tool life in ferrous and hardened materials. The cutter runs a 0.1800-inch cutting diameter, a 0.5000-inch length of cut, and a 3/16-inch (0.1875-inch) shank diameter. Overall length is 2.5 inches. This tool is used by machinists and toolmakers in CNC milling operations where a single tool must produce both internal and external thread forms without a tool change.

The 70046-C3 suits CNC machining centers running helical interpolation routines for 1/4-28 UNF threads. Its compact shank and short length of cut make it appropriate for thread milling in blind holes and through-bores alike, as well as external boss threads. At 28 teeth per inch, it is matched to fine-pitch thread applications common in precision assemblies, instrumentation, and fluid fittings. No coolant-through capability is incorporated, so flood or mist coolant applied externally at the spindle is standard practice for this tool.

Key Features

• Cuts 1/4-28 UNF threads — internal and external — in a single helical interpolation pass
• 3-flute solid carbide construction for rigidity and wear resistance
• AlTiN coating improves heat resistance and tool life in ferrous and hardened workpiece materials
• 0.1800-inch cutting diameter with 0.5000-inch length of cut
• 3/16-inch (0.1875-inch) shank fits standard ER and end mill collet chucks
• 2.5-inch overall length provides clearance for most standard spindle setups

Compatibility

Designed for use on CNC milling machines capable of helical interpolation; compatible with workpieces requiring 1/4-28 UNF internal or external threads with a minimum nominal diameter of 0.2500 inches.

Installation Notes

Installation and operation of this thread mill should be performed by a qualified machinist familiar with CNC helical interpolation programming. Secure the shank in a precision collet or end mill holder and verify runout before cutting. Confirm spindle speed, feed rate, and helix pitch in the CAM program before engaging the workpiece. Always bring the spindle to a complete stop before changing or measuring the tool.