Seco 00007350 Turning Insert TNMG321-MR4-48 Carbide

Product Description

The SECO 00007350 is a solid carbide, uncoated turning insert in the TNMG series, designed for precision metal cutting on CNC and manual lathes. It carries the TNMG321-MR4 industry standard designation and features a triangular insert shape with a 60-degree included angle, providing six usable cutting edges per insert. The MR4 chip breaker geometry and T-Land cutting edge style are optimized for controlled chip formation during turning, boring, facing, and back turning operations. The uncoated 883 carbide grade is suited for applications where coating adhesion is a concern or where sharp-edge performance is critical.

This insert is primarily intended for machining superalloys and titanium, corresponding to ISO material code S, with secondary suitability for stainless steels (M), cast iron (K), non-ferrous materials (N), and hardened materials (H). It fits standard TNMG toolholders using clamp, pin, or lever lock holding methods. Typical users include CNC machinists and tool-and-die professionals working in aerospace, medical, and high-performance manufacturing environments where superalloy and titanium workpieces are common.

Key Features

• Uncoated solid carbide construction — 883 grade, optimized for superalloys and titanium (ISO code S)
• 6 cutting edges per insert — triangular shape with 60-degree included angle maximizes tool life per insert
• MR4 chip breaker with T-Land cutting edge style for controlled chip evacuation
• Neutral hand orientation — compatible with standard right- and left-hand TNMG toolholder setups
• Multi-use geometry supports turning, boring, facing, and back turning in a single insert
• Meets ANSI and ISO standards; ISO code TNMG160304-MR4

Compatibility

Designed for use in standard TNMG-style toolholders that accept clamp, pin, or lever lock insert holding methods. Compatible with material grades S10, S20, and S30 for superalloy and titanium applications, and suitable for secondary workpiece material codes M, K, N, and H. Insert size code 321; industry standard number TNMG321-MR4.

Installation Notes

Installation is performed by qualified machinists following shop safety procedures — power down and de-energize the machine spindle before seating or replacing inserts. Use the appropriate torque wrench and clamp hardware specified for the TNMG toolholder to secure the insert without over-tightening. Inspect the insert pocket and seating surface for debris or damage before installation, as contamination can cause premature insert failure or dimensional error. Handle carbide inserts with care; edges are brittle and can chip if dropped or struck.