Accupro 75288258 CNMX431 Carbide Turning Insert

Product Description

The ACCUPRO 75288258 is a CNMX-style indexable carbide turning insert designed for precision metal cutting on CNC and manual lathes. It carries ANSI insert code CNMX431 and ISO code CNMX120404, placing it in the C-shape 80-degree diamond (rhombic) insert family. The insert is manufactured from carbide with a CVD coating in grade ACP15K, delivering high to moderate wear resistance across steel, stainless steel, and cast iron workpiece materials. With four cutting edges and a screw-type holding method, it provides extended tool life and straightforward indexing in compatible toolholders. Corner radius is 0.40 mm (0.0157 inches), suited for finishing and semi-finishing passes.

This insert is appropriate for turning operations on steel (ISO P), stainless steel (ISO M), and cast iron (ISO K) workpieces in both production and job-shop environments. The SWX+ chip breaker geometry supports controlled chip evacuation during moderate to high-feed passes. Typical applications include OD turning, facing, and light profiling on CNC turning centers and engine lathes. The neutral hand orientation makes it compatible with both left- and right-hand toolholder setups. Sold individually; minimum order quantity is 10 units per the manufacturer requirement.

Key Features

• ANSI code CNMX431 and ISO code CNMX120404 for direct cross-reference and toolholder matching
• CVD-coated carbide grade ACP15K for high wear resistance on steel, stainless steel, and cast iron
• 80-degree diamond (rhombic) C-shape with 0.40 mm corner radius for finishing and semi-finishing cuts
• Four cutting edges per insert to maximize cost-per-edge value
• SWX+ chip breaker geometry for controlled chip formation at moderate to high feed rates
• Screw-type insert holding method with negative side clearance for rigid, repeatable clamping

Compatibility

Designed for use in CNMX-style screw-lock turning toolholders accepting a 0.5000-inch inscribed circle insert with ANSI size code 431 or ISO size code 120404. Verify toolholder seat geometry and insert pocket tolerance code M before installation.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torx or hex key to seat the clamping screw to the toolholder manufacturer's specified feel without over-torquing, as carbide inserts are brittle and can crack under uneven clamping pressure. Inspect the insert pocket and seating surface for chips or debris before installing a fresh edge.