DNMG 150408-TM OS8225 Carbide Turning Insert

The DNMG 150408-TM OS8225 is a negative-rake carbide turning insert designed for medium machining operations in CNC and conventional lathes. With its 55° rhombic geometry, it provides a strong balance between accessibility and edge strength. The 0.8 mm corner radius increases insert durability, allowing higher feed rates and stable performance during continuous machining.

Manufactured in OS8225 grade, this insert combines wear resistance with toughness, making it an excellent choice for machining steels under medium cutting conditions. The HM chipbreaker is optimized for medium machining, ensuring reliable chip evacuation, lower cutting forces, and stable cutting action. This results in consistent tool life and good surface finishes.

The DNMG 150408-HM OS8225 is fully compatible with MDJNR and DDJNR external turning holders, which are designed for 55° rhombic inserts. It is commonly used in automotive, mold making, and general engineering industries, where productivity and consistency in machining steels are critical.

Code Breakdown:

• D – Insert shape: 55° rhombic

• N – Clearance angle: 0° (negative rake)

• M – Tolerance class (medium)

• G – Insert with hole and chipbreaker

• 15 – Insert size: 15 mm

• 04 – Insert thickness: 4.76 mm

• 08 – Corner radius: 0.8 mm

• TM – Chipbreaker for medium machining

• OS8225 – Grade optimized for steels

Key Features:

• DNMG-style 55° rhombic carbide turning insert

• Size: 15×15 mm, thickness 4.76 mm, radius 0.8 mm

• OS8225 grade – balanced wear resistance and toughness for steels

• HM chipbreaker for medium machining and chip control

• Negative rake design for durability and stability

• Fits holders: MDJNR, DDJNR

• Suitable for medium machining of steels

Grade Information (OS8225):

• Coating: PVD, black color

• Application: turning and milling of steels (general purpose), also usable on stainless steels

• Best for: medium machining of steels

• Material hardness: HRC <30

• Cutting speed: 180–250 m/min