Hertel 8851973 CNMG432JH Cermet Turning Insert

Product Description

The HERTEL 8851973 is a CNMG432JH turning insert manufactured from cermet and finished with a PVD-applied TiN coating. Designed for precision CNC turning operations, this insert features an 80-degree diamond shape with a neutral hand orientation and a 0-degree clearance angle. The inscribed circle measures 0.5 inches, insert length is 0.4724 inches (12 mm), thickness is 0.1875 inches, and the corner radius is 0.0312 inches (1/32 inch). The HP225CR grade cermet substrate with TiN coating is suited for finishing and semi-finishing cuts where surface quality and edge retention are critical priorities. This insert is installed and managed by machinists, CNC operators, and tool-crib technicians in metalworking and manufacturing environments.

This turning insert is intended for use in CNMG-style toolholders configured for neutral-hand cutting. Typical applications include external turning on CNC lathes and turning centers in production and job-shop environments. The 80-degree diamond insert shape provides a strong cutting edge geometry suitable for longitudinal turning and facing operations. The chip breaker designation G and clamp-plus-pin holding method make this insert compatible with standard CNMG toolholder systems used across light to medium-duty turning applications on ferrous and non-ferrous workpieces where cermet grades perform effectively.

Key Features

• Cermet substrate with PVD TiN coating for wear resistance and edge retention in finishing cuts
• 80-degree diamond insert shape (CNMG style) with neutral hand orientation
• 0.0312-inch corner radius for fine surface finish requirements
• Clamp and pin holding method for secure seating in CNMG toolholders
• G-style chip breaker geometry for controlled chip formation
• Tolerance code M and clearance code N per ANSI insert designation standards

Compatibility

Designed as an OEM-style replacement or standard stocking insert for CNMG432-style toolholders that accept clamp-and-pin mounting with a 0.2030-inch hole diameter.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the lathe or turning center is fully powered down and the spindle is locked before changing inserts. Use the appropriate torx or hex key as specified by the toolholder manufacturer when tightening the clamp screw — do not over-torque. Inspect the toolholder pocket and locating pin for wear or debris before seating the new insert.