Harvey Tool 987136 Thread Mill 10-32 Internal 3 Flute Carbide

Product Description

The HARVEY TOOL 987136 is a solid carbide helical flute thread mill designed for cutting internal 10-32 threads in metalworking applications. It features a 3-flute helical geometry that produces clean thread forms while reducing cutting forces compared to single-point threading methods. The tool runs a 0.150-inch cutting diameter with a 0.500-inch length of cut, making it well suited for through and blind hole threading in tight bores. With a bright uncoated finish and 32 teeth per inch, it delivers consistent thread geometry in a range of workpiece materials. Installed by machinists and tool and die professionals, this mill is a direct replacement for tap-based threading in CNC machining centers.

This thread mill is intended for internal threading operations on CNC machining centers where helical interpolation is available. It targets 10-32 UNF thread forms in materials where solid carbide tooling is preferred, including steel, aluminum, and stainless. The 3/16-inch (0.1875-inch) shank diameter keeps the tool compact for small-bore work. A minimum nominal bore diameter of 0.190 inches applies, so verify bore clearance before use. No coolant-through capability is present; flood or mist cooling is recommended at the spindle.

Key Features

• Solid carbide construction for rigidity and wear resistance in metalworking applications
• 3-flute helical design reduces cutting forces and improves chip evacuation
• 0.150-inch cutting diameter suits small-bore internal threading
• 0.500-inch length of cut accommodates standard thread depth requirements for 10-32 UNF
• Bright uncoated finish compatible with a broad range of base materials
• 32 TPI matches 10-32 UNF thread specification exactly

Compatibility

Designed for internal 10-32 UNF thread milling on CNC machining centers capable of helical interpolation; requires a minimum nominal bore diameter of 0.190 inches.

Installation Notes

This tool is installed and operated by machinists on CNC machining centers using helical interpolation cycles — confirm your CAM or controller supports this before programming. Power down the spindle and secure the tool with the correct collet or tool holder rated for the 0.1875-inch shank before tightening. Do not use this tool in manual or non-interpolating drilling operations. Apply flood or mist coolant externally, as this tool does not support coolant-through delivery.