DNMG 150404-HM OS8225 Carbide Turning Insert

The DNMG 150404-HM OS8225 is a negative-rake carbide turning insert designed for precision medium machining on CNC and conventional lathes. Its 55° rhombic geometry provides excellent accessibility to tight machining areas while maintaining edge strength. With a 0.4 mm corner radius, this insert is ideal for applications requiring high dimensional accuracy and fine surface finishes.

Produced in the OS8225 grade, the insert combines toughness with wear resistance, making it highly reliable for machining steels. The HM chipbreaker is tailored for medium cutting operations, ensuring stable chip evacuation, reduced cutting forces, and extended tool life under continuous machining conditions.

The DNMG 150404-HM OS8225 is compatible with standard MDJNR and DDJNR holders, designed for 55° rhombic inserts. It is commonly applied in automotive, mold manufacturing, and general engineering industries where consistent accuracy and efficiency in machining steels are essential.

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

• 04 – Corner radius: 0.4 mm

• HM – 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 0.4 mm

• OS8225 grade – strong balance of wear resistance and toughness for steels

• HM chipbreaker for medium machining and chip control

• Negative rake design for stability under load

• 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