Harvey Tool 987110-C8 Thread Mill 2-56 Internal Solid Carbide

Product Description

The HARVEY TOOL 987110-C8 is a straight flute thread mill designed for cutting internal 2-56 UN threads in a single helical pass. Built from solid carbide and finished with a Titanium Diboride (TiB2) coating, it delivers consistent thread geometry and extended tool life in small-diameter applications. With a 0.069-inch cutting diameter, a 0.215-inch length of cut, and 56 teeth per inch, this tool is suited for precision threading operations in hardened and abrasive workpiece materials. It runs on a 1/8-inch shank and measures 2 inches in overall length. Machinists and tool-and-die professionals use it in CNC machining centers where thread milling is preferred over tapping.

This thread mill is intended for internal threading of 2-56 holes in materials where solid carbide and TiB2 coating provide a clear advantage over high-speed steel taps — including hardened steels, stainless alloys, and non-ferrous metals. The straight flute geometry suits short-chipping materials and blind-hole applications where chip evacuation is straightforward. Typical use cases include prototype machining, aerospace component production, medical device manufacturing, and any application requiring tight-tolerance miniature threads.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding materials
• TiB2 (Titanium Diboride) coating reduces friction and extends tool life
• Straight flute geometry suited for short-chipping and blind-hole threading
• 3-flute design balances chip clearance with cutting edge support at small diameters
• Cuts 2-56 UN internal threads at 56 TPI with a 0.069-inch cutting diameter
• 1/8-inch shank diameter compatible with standard miniature toolholders and collet chucks

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for thread milling operations producing 2-56 UN internal threads. Fits standard 1/8-inch collet chucks and toolholders.

Installation Notes

Thread milling requires a CNC machining center with helical interpolation capability — confirm control support before use. Secure the tool in a precision collet or milling chuck sized for a 1/8-inch shank, ensuring adequate runout control at small diameters. Verify spindle speed, feed rate, and helical pitch settings against the manufacturers recommended cutting data before engaging the workpiece. Inspect the tool edge under magnification before use; solid carbide tools at this diameter are brittle and should never be used if chipping is visible.