Harvey Tool 987154-C3 Thread Mill 5/16-18 Solid Carbide

Product Description

The HARVEY TOOL 987154-C3 is a helical flute thread mill designed for cutting internal threads in a CNC machining environment. Built from solid carbide and finished with an AlTiN coating, this tool handles the demands of threading harder workpiece materials where heat resistance and edge retention are critical. It produces a 5/16-18 Unified National Coarse thread profile using a 3-flute helical geometry that distributes cutting forces evenly and supports chip evacuation. The cutting diameter is 0.2450 inches with a 0.9440-inch length of cut. Machinists and CNC programmers working in job shops, aerospace, or precision manufacturing will find this tool suited to tight-tolerance internal threading operations.

This thread mill is intended for internal threading applications requiring a 5/16-18 thread form. It runs at 18 teeth per inch and is suited for use in materials where AlTiN coating provides thermal and wear protection, such as stainless steel, titanium, hardened steels, and similar alloys. With a 0.3125-inch shank diameter and a 3.0000-inch overall length, it fits standard CNC machining center tool holders designed for that shank size. Coolant-through is not supported on this tool, so external coolant or air blast should be used during operation.

Key Features

• Solid carbide construction for rigidity and long tool life in demanding materials
• AlTiN coating improves heat resistance and reduces tool wear in high-temperature cutting conditions
• 3-flute helical geometry promotes smooth cutting action and efficient chip removal
• 0.2450-inch cutting diameter with 0.9440-inch length of cut for precise thread depth control
• 5/16-18 internal thread profile at 18 TPI for Unified National Coarse applications
• No coolant-through design - compatible with external coolant or air blast setups

Compatibility

Designed for CNC machining centers using standard tool holders with a 0.3125-inch shank bore. Cuts 5/16-18 internal thread forms in a single helical interpolation pass. Suitable for use in workpiece materials that benefit from AlTiN coating performance.

Installation Notes

Installation and operation should be performed by a qualified CNC machinist or tooling programmer. Secure the shank in a collet or end mill holder rated for the 0.3125-inch diameter and verify runout before cutting. Program the tool path as a helical interpolation move matching the 5/16-18 thread lead. Because this tool does not support coolant-through, direct external coolant or compressed air at the cutting zone to manage chip evacuation and heat.