Accupro C931-45750 Thread Mill Internal 3 Flute Solid Carbide

Product Description

The ACCUPRO C931-45750 is an internal helical flute thread mill designed for cutting M4.5 x 0.75 metric coarse threads in a single helical pass. Built from micrograin solid carbide and finished with a TiAlN coating, this tool delivers heat resistance and edge retention at elevated cutting speeds. The 3-flute right-hand design produces clean internal thread profiles with reduced cycle time compared to single-point threading. With a 0.12 inch cutting diameter and 0.25 inch length of cut, it is suited for small-bore threading operations in precision machining environments. Machinists and tool and die professionals working in production or prototype settings are the primary users.

This thread mill is intended for internal threading applications on machining centers and CNC mills capable of helical interpolation. It targets M4.5 x 0.75 metric coarse thread forms in ferrous and non-ferrous workpiece materials where tight tolerances are required. The TiAlN coating supports use in harder materials and higher-speed dry or semi-dry cutting conditions. The 1/8 inch shank diameter fits standard collet and end mill holders common in small-part machining setups.

Key Features

• Micrograin solid carbide substrate for rigidity and wear resistance in small-diameter threading
• TiAlN coating provides thermal barrier for elevated cutting speeds and extended tool life
• 3 right-hand flutes for efficient chip evacuation in blind and through-hole internal threading
• Helical flute geometry allows full M4.5 x 0.75 thread profile in one interpolated pass
• 0.75 mm pitch matches metric coarse thread standard for M4.5 fastener applications
• No coolant-through requirement simplifies setup on standard machining centers

Compatibility

Designed as an OEM-style replacement and standard production thread mill for internal M4.5 x 0.75 metric coarse threading operations on CNC machining centers with helical interpolation capability.

Installation Notes

Installation is performed by qualified machinists using a compatible collet or end mill holder sized for a 1/8 inch shank. Confirm machine spindle and tool holder runout are within acceptable limits before threading operations, as runout directly affects thread quality at this diameter. Program helical interpolation to match the 0.75 mm pitch and verify minimum bore diameter clears the 0.12 inch cutting diameter before engaging the workpiece. Always inspect the cutting edge for wear or chipping before each use; carbide tools at this scale are sensitive to improper seating and side-loading.