Harvey Tool 987110-C3 Thread Mill 2-56 Internal Carbide

Product Description

The HARVEY TOOL 987110-C3 is a straight flute thread mill designed for cutting internal 2-56 UN threads in precision machining applications. Built from solid carbide and coated with AlTiN for heat and wear resistance, this tool handles the tight tolerances required by 56 TPI thread forms. It runs a 0.069 inch cutting diameter with a 0.215 inch length of cut and a 2 inch overall length. The 1/8 inch shank diameter suits standard collet toolholding setups. Machinists and tool-and-die professionals use this style of thread mill to produce clean internal threads in hard or abrasive workpiece materials where taps are prone to breakage.

This thread mill is suited for CNC machining centers performing internal thread milling in small-diameter holes. The 2-56 thread size places it in fine-pitch, miniature-fastener territory common in precision instrument assemblies, electronics enclosures, and small mechanical components. Three flutes provide a balance of chip clearance and cutting edge strength at this diameter. The straight flute geometry is appropriate for shorter chipping materials where helical flutes are not required. No coolant-through capability means external coolant or air blast is the standard delivery method for chip evacuation.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• AlTiN coating extends tool life in dry or high-temperature cutting conditions
• 2-56 UN internal thread form, 56 TPI, for miniature fastener applications
• 0.069 inch cutting diameter with 0.215 inch length of cut
• 3 straight flutes suit short-chipping workpiece materials
• 1/8 inch shank diameter fits standard collet and toolholder systems

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for internal thread milling; compatible with standard 1/8 inch collets and toolholders accepting a 1/8 inch shank diameter.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation — confirm control compatibility before programming. Secure the shank fully in a precision collet or toolholder to minimize runout at this cutting diameter. Power down and lock out the spindle before loading or removing the tool. Follow the toolmaker and machine builder guidelines for feed rate, stepover, and RPM at this diameter and material combination.