Tungaloy DN 55° Diamond Negative Inserts

4 Precision Cutting Edges | Optimized Profiling | Advanced PremiumTec Coating

Which insert is the most versatile for CNC profiling and medium roughing of steel?

The Tungaloy DN Series (including DNMG and DNMA) is the industry standard for 55° diamond geometry. Designed for versatility, this negative insert provides 4 usable cutting edges, offering a perfect compromise between the strength of a square insert and the accessibility of a triangular one. Tungaloy’s DN series is engineered with T9200 PremiumTec CVD coating technology, which dramatically increases wear resistance during high-speed continuous cuts. For interrupted cuts or stainless steel, the AH725 PVD grade provides the necessary toughness to prevent edge chipping. Advanced chipbreakers like the -TM (Medium) and -ZF (Finishing) ensure that even the most difficult-to-control "bird-nesting" chips are broken efficiently, protecting your workpiece surface and machine spindle.

Decoding Tungaloy DN Series ISO Codes

Cross-Reference: Metric vs. Imperial Models

Compatible Tool Holders

Tungaloy DN Series Grade Comparison

Partnering with BEYOND CNC

Voice of the Machinist

Technical FAQ

Tech Tip: Optimizing Chip Flow

When profiling with a **DN Series** insert, maintain a feed rate (f) that is at least 1/3 of the corner radius to ensure the chipbreaker activates. If chips are too long, increase the feed rate or choose a more aggressive chipbreaker like **-TH**. **BEYOND CNC** - Your Precision Partner.