CNMG 120408-TM OS8235 Turning Inserts

The CNMG 120408-TM OS8235 Turning Inserts are robust double-sided carbide inserts designed for medium turning operations. Produced with the OS8235 grade, these inserts feature a fine-grain carbide substrate enhanced with advanced PVD coating. This combination provides excellent wear resistance, high thermal stability, and toughness, ensuring reliable performance in both continuous and slightly interrupted cuts.

The TM chipbreaker geometry offers stable cutting action, effective chip evacuation, and reduced cutting forces. This ensures improved surface finish and productivity, while minimizing vibration. With their double-sided square geometry, the CNMG 120408-TM OS8235 Turning Inserts deliver multiple cutting edges, increasing cost efficiency for high-volume production.

These inserts are optimized for steels (ISO P20–P35) and stainless steels (ISO M20–M30), making them highly versatile for general machining, automotive, and energy sector applications. The OS8235 grade ensures long tool life, even under demanding machining conditions, while maintaining consistent precision.

Code Breakdown

• CNMG – 80° rhombic, negative clearance, double-sided insert

• 12 – Insert size (12 mm cutting edge length)

• 04 – Insert thickness (4.76 mm)

• 08 – Corner radius (0.8 mm)

• TM – Chipbreaker for medium turning

• OS8235 – PVD-coated carbide grade for steels and stainless steels

Key Features of the Turning Insert

• Fine-grain carbide substrate with excellent durability

• OS8235 PVD coating for wear resistance and heat stability

• TM geometry for stable cutting and chip control

• Double-sided insert with multiple cutting edges

• Optimized for steels and stainless steels

Equivalent Turning Inserts from Other Brands

• Sandvik: CNMG 120408-PM 4325 (Sandvik official site)

• Seco: CNMG 120408-M3 F30M

• Kennametal: CNMG 120408-MP KCP25

• Iscar: CNMG 120408-TF IC907

Recommended Cutting Data

• Cutting speed (steel): 150–250 m/min

• Cutting speed (stainless steel): 120–200 m/min

• Depth of cut: up to 4.0 mm

The CNMG 120408-TM OS8235 Turning Inserts are a cost-efficient and reliable choice for machinists seeking durability, precision, and versatility in medium turning operations. For more carbide turning and milling inserts, visit our Diamond Cut store.