Description

The SECO 03276693 is a WNMG331-M3 series indexable turning insert manufactured from solid carbide with a multilayer CVD coating of TiCN, Al2O3, and Cr. Rated at manufacturer grade TP25, it is designed for general-purpose turning operations including boring, facing, and straight turning. The insert features an 80-degree trigon shape with a neutral hand orientation, a 3/8 inch inscribed circle, and a 0.0157 inch corner radius. The M3 chip breaker geometry is optimized for moderate depths of cut and feed rates. Machinists and CNC lathe operators install this insert in compatible toolholders for production and job-shop turning applications.

This insert is primarily intended for machining steel (ISO material code P, grades P20, P30, and P35) and is also suitable for secondary applications on stainless steel (code M) and cast iron (code K). With six available cutting edges per insert, it is well-suited for production environments where cost-per-edge efficiency matters. Typical applications include external turning, internal boring, and facing operations on CNC lathes and turning centers in both residential job-shop and industrial production settings.

Key Features

CVD multilayer coating (TiCN, Al2O3, Cr) for wear resistance and thermal stability on steel workpieces
Six cutting edges per insert for extended tool life and low cost per edge
M3 chip breaker geometry suited for boring, facing, and turning at moderate parameters
Chamfered and honed cutting edge style for edge strength and surface finish
Compatible with clamp, pin, and lever-lock toolholder holding methods
Conforms to ANSI and ISO standards; ISO code WNMG060404-M3

Compatibility

Designed for use in WNMG-style indexable toolholders that accept a 3/8 inch inscribed circle trigon insert with a 0.150 inch hole diameter, using clamp, pin, or lever-lock holding methods. Compatible toolholders must accommodate the WNMG insert shape code W with tolerance code M and clearance code N.

Installation Notes

Installation is performed by machinists or CNC tooling technicians. Power down and lock out the machine before indexing or replacing inserts. Use the appropriate torque wrench or insert key specified by the toolholder manufacturer to secure the clamping mechanism do not over-tighten or use improvised tools. Inspect the insert seat and shim for debris or damage before seating a fresh cutting edge.