Accupro C931-08125 Thread Mill M8x1.25 3 Flute Carbide

Product Description

The ACCUPRO C931-08125 is a solid carbide internal thread mill designed for cutting M8 x 1.25 metric coarse threads in a single helical pass. Built from micrograin solid carbide and coated with TiAlN for heat and wear resistance, this tool is suited for high-speed threading operations in ferrous and non-ferrous materials. It features 3 right-hand flutes, a 0.235-inch cutting diameter, and a 0.250-inch (6.00 mm) shank diameter. The 0.625-inch length of cut accommodates standard M8 thread depths. This tool is used by machinists and CNC programmers in production and job-shop environments.

This thread mill is intended for internal threading operations where a tap would be impractical or where a single tool must produce threads in multiple materials or diameters. It is well-suited for CNC machining centers running metric coarse thread programs. The minimum nominal bore diameter for this tool is 0.315 inches (8.00 mm), making it appropriate for M8 thread applications in through-holes and blind holes. No coolant-through capability is present, so flood or mist coolant applied externally is the standard approach during cutting.

Key Features

• Solid micrograin carbide construction for rigidity and edge retention in demanding cuts
• TiAlN coating improves heat resistance and extends tool life in ferrous materials
• 3 right-hand helical flutes for efficient chip evacuation during internal threading
• 0.235-inch cutting diameter with 0.625-inch length of cut for standard M8 thread depths
• Metric coarse thread standard (M8 x 1.25) for broad compatibility in metric workpieces
• Single-point thread milling process reduces axial cutting forces compared to tapping

Compatibility

Designed for internal metric coarse thread milling operations requiring an M8 x 1.25 thread form. Requires a CNC machining center capable of helical interpolation. Minimum bore entry diameter is 0.315 inches.

Installation Notes

Installation and use of this tool requires a CNC machining center with helical interpolation capability and a collet or tool holder sized for a 0.250-inch shank. Verify shank runout is within tolerance before cutting, as excessive runout accelerates edge wear on carbide thread mills. Ensure spindle and program direction match the right-hand flute geometry. External flood or mist coolant should be directed at the cutting zone, as this tool does not support coolant-through delivery.