Sumitomo U103469 Ceramic Turning Insert TNGA322 NB90S

Product Description

The SUMITOMO U103469 is an uncoated ceramic turning insert in the TNGA series, designed for precision single-point turning operations on CNC and manual lathes. It carries an ANSI designation of TNGA322 and a manufacturer grade of NB90S, identifying it as a ceramic, negative-rake geometry insert suited for high-speed finishing and semi-finishing passes. With a triangular insert shape and a 3/8-inch inscribed circle, this insert delivers stable cutting geometry across a wide range of depths of cut. The corner radius measures 1/32 inch (0.0313 inch), providing a balance of edge strength and surface finish quality. Weight is 0.05 pounds.

This insert is specified primarily for machining cast iron workpieces, corresponding to ISO material group K. The TNGA geometry with negative rake and N clearance angle suits interrupted and continuous cuts in hard, abrasive ferrous materials where ceramic tooling outperforms carbide at elevated surface speeds. Typical installation environments include production turning centers and job-shop lathes where high thermal resistance and wear life justify the use of ceramic grades. The A chip breaker designation applies to this insert for controlled chip flow during finishing operations.

Key Features

• Uncoated ceramic insert material for high-speed machining of cast iron and abrasive workpieces
• TNGA322 ANSI designation with negative rake geometry for stable, secure clamping
• 3/8-inch (0.3750 inch) inscribed circle for broad depth-of-cut range
• 1/32-inch (0.0313 inch) corner radius balances edge toughness and surface finish
• Compatible with clamp and pin insert-holding methods for rigid tool setups
• Meets ANSI and ISO 13399 standards for interchangeable tooling identification

Compatibility

Designed as an OEM-style replacement turning insert for toolholders accepting TNGA-style inserts with clamp or pin holding methods, negative rake, and a 3/8-inch inscribed circle per ANSI and ISO 13399 specifications.

Installation Notes

Installation of turning inserts should be performed by a qualified machinist or tooling technician with the machine fully powered down and the spindle locked. Use the appropriate torque wrench and manufacturer-specified clamping hardware to seat the insert securely in the pocket; do not overtighten or use substitute fasteners. Inspect the insert pocket for debris, damage, or wear before seating a new insert, as a compromised pocket will affect edge position and tool life. Handle ceramic inserts with care, as they are brittle and susceptible to chipping from impact or dropping.