Accupro 75260638 CNMG431 Carbide Turning Insert

Product Description

The ACCUPRO 75260638 is an uncoated carbide turning insert in the CNMG style, designed for precision metal cutting on CNC lathes and turning centers. It carries the ANSI code CNMG431 and ISO code CNMG120404, with a diamond (rhombic) 80-degree insert shape and a neutral hand orientation. The insert features a 0.40 mm (0.0157 inch) corner radius, a 0.5000-inch inscribed circle, and a thickness of 0.1874 inches. With four available cutting edges and a negative side clearance, it delivers high wear resistance across a range of workpiece materials. Licensed machinists and CNC operators install this insert in production and job-shop turning applications.

This insert is suited for turning steel (P-class), stainless steel (M-class), and cast iron (K-class) workpieces. The ATP15M grade is optimized for high wear resistance when cutting steel and stainless steel, and high wear resistance when cutting cast iron. It is appropriate for moderate to finishing depth-of-cut passes, with a maximum depth of cut of 2.00 mm (0.0787 inches). The EN-JF chip breaker geometry supports chip control in these material groups. Typical applications include general-purpose external and internal turning on production lathes in both light manufacturing and heavy machining environments.

Key Features

• ANSI code CNMG431 and ISO code CNMG120404 for direct toolholder cross-reference
• Uncoated carbide substrate in manufacturer grade ATP15M for wear resistance in steel, stainless steel, and cast iron
• 80-degree diamond (C-shape) insert geometry with neutral hand orientation
• Four cutting edges with negative side clearance (clearance code N, tolerance code M)
• EN-JF chip breaker for controlled chip formation across P, M, and K workpiece material classes
• Maximum depth of cut 2.00 mm (0.0787 inches) suitable for finishing and light semi-finishing passes

Compatibility

Designed as an OEM-style replacement insert for CNMG431-style toolholders accepting a 0.5000-inch inscribed circle carbide insert with clamp, lever lock, pin, or screw holding methods.

Installation Notes

Installation is performed by qualified machinists or CNC operators. Power down and lock out the machine before changing inserts. Use the appropriate torque wrench and insert key specified by the toolholder manufacturer when securing the clamp, screw, or lever lock — do not over-tighten by hand. Inspect the insert seat and toolholder pocket for chips or debris before seating the new insert to ensure proper contact and runout.