Harvey Tool 70056-C3 Thread Mill 5/16-24 3 Flute Carbide

Product Description

The HARVEY TOOL 70056-C3 is a solid carbide helical flute thread mill designed to cut 5/16-24 UNF threads in both internal and external applications. With 3 flutes and an AlTiN coating, this tool delivers durability and heat resistance in demanding ferrous and hardened material machining environments. The 0.2350-inch cutting diameter and 0.6250-inch length of cut allow precise thread engagement, while the 1/4-inch shank fits standard collet chucks and tool holders. Machinists and CNC operators in manufacturing, aerospace, and general metalworking shops rely on tools like this for thread milling operations where tap breakage risk or blind-hole constraints make tapping impractical.

This thread mill is suited for use on CNC machining centers capable of helical interpolation. It handles both internal and external 5/16-24 thread profiles in a single tool, reducing tooling inventory requirements. The 2.5-inch overall length provides clearance in most standard setups. Applications include precision threading in aluminum, steel, stainless, and other materials where the AlTiN coating provides thermal protection and extended tool life.

Key Features

• Cuts 5/16-24 UNF threads in both internal and external configurations
• 3-flute helical design for efficient chip evacuation during thread milling
• AlTiN coating for heat resistance and extended tool life in ferrous materials
• Solid carbide construction for rigidity and dimensional stability
• 24 teeth per inch with 0.2350-inch cutting diameter for accurate thread form
• No coolant-through design — suitable for flood or mist coolant delivery at the spindle

Compatibility

Designed for use on CNC machining centers with helical interpolation capability. Fits 1/4-inch collet chucks and compatible tool holders. Cuts 5/16-24 UNF thread profiles with a minimum nominal diameter of 0.3125 inches.

Installation Notes

Installation and operation should be performed by qualified CNC machinists familiar with helical interpolation thread milling cycles. Secure the shank fully in a collet or end mill holder before operation and verify runout before cutting. Program the correct helical interpolation path for the target thread pitch and direction. Follow machine tool manufacturer guidelines for feeds, speeds, and depth of cut when working with carbide thread mills.