Sumitomo U103435 Ceramic Turning Insert DNGA432 NB90S

Product Description

The SUMITOMO U103435 is an uncoated ceramic turning insert designed for high-speed metal cutting applications. Manufactured to the DNGA432 standard with a 55-degree diamond shape and negative rake geometry, this insert delivers consistent performance in demanding turning operations. The 0.5-inch inscribed circle and 0.6102-inch length make it a compact yet capable insert suited for precision material removal. With a 1/32-inch corner radius and NB90S ceramic grade, it is engineered for use on cast iron workpieces where heat resistance and edge integrity are critical. Licensed machinists and CNC lathe operators are the primary installers of this insert.

This insert is primarily intended for turning cast iron (ISO material code K) in both roughing and finishing passes where ceramic tooling offers thermal and wear advantages over carbide. The DNGA geometry with negative rake and zero-degree relief angle is a standard configuration for rigid, high-rigidity setups. It is compatible with toolholders designed for DNGA-style inserts using clamp and pin holding methods. The Series DN designation and ISO code DNGA150408 provide additional cross-reference guidance for toolholder selection.

Key Features

• Uncoated ceramic insert grade NB90S optimized for cast iron turning
• 55-degree diamond insert shape for versatile approach angle options
• Negative rake geometry for increased edge strength in heavy cuts
• 1/32-inch corner radius for a balance of edge strength and surface finish
• Clamp and pin holding method for secure seating in compatible toolholders
• Meets ANSI and ISO 13399 standards for consistent dimensional accuracy

Compatibility

Designed for use in DNGA-style toolholders that accept clamp and pin insert holding, conforming to ANSI and ISO 13399 standards. Verify toolholder pocket dimensions against the DNGA432 insert size code and ISO code DNGA150408 before installation.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. The machine spindle must be fully stopped and the turret or tool post de-energized before indexing or replacing the insert. Use appropriate insert seating tools to avoid chipping the ceramic cutting edge during clamping. Ceramic inserts are brittle compared to carbide and should not be used for interrupted cuts unless the grade is specifically rated for that application.