Sumitomo 1NHM012 Turning Insert Dcgt 55 Diamond AC530U

Product Description

The SUMITOMO 1NHM012 is a solid carbide turning insert in the DCGT style, designed for precision external turning operations on CNC and manual lathes. It carries the ANSI code DCGT32.50.5MESI and ISO code DCGT11T302, with a 55-degree diamond (rhombic) shape and a positive rake geometry that reduces cutting forces on finish and semi-finish passes. The insert is PVD-coated with TiAlN and AlCrN layers under SUMITOMO proprietary Super ZX coating designation, grade AC530U. Key dimensions include a 3/8 inch inscribed circle, a 0.4567 inch insert length, and a 0.0078 inch corner radius suited to fine surface finish requirements.

This insert is intended for light to medium machining applications. Grade AC530U is engineered for steel (P-class), stainless steel (M-class), and cast iron (K-class) workpiece materials, offering a range from high wear resistance to moderate toughness depending on the material group. It is appropriate for use in production turning environments where consistent chip control and coating durability are priorities. The MESI chip breaker geometry is optimized for light and medium depths of cut and is well-suited to finishing passes on stainless and alloy steels.

Key Features

• DCGT-style insert with 55-degree diamond shape and positive rake for reduced cutting forces
• PVD TiAlN and AlCrN dual-layer coating (Super ZX) for thermal stability and edge retention
• Grade AC530U rated for steel (P), stainless steel (M), and cast iron (K) workpiece materials
• MESI chip breaker supports light and medium machining operations
• 0.0078 inch corner radius for fine surface finish applications
• Screw-clamped insert holding method with positive side clearance

Compatibility

Designed for use in DCGT-style screw-clamped turning toolholders with a 3/8 inch inscribed circle seat. Conforms to ANSI and ISO 13399 standards. ISO code DCGT11T302; ISO full code DCGT11T302MN-S. Verify toolholder seat specification before installation.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque driver for the clamping screw to seat the insert fully without overloading the screw thread. Inspect the insert pocket for debris or wear before seating a new insert.