WNMG 080404-MM OS5105 Carbide Turning Insert

The WNMG 080404-MM OS5105 is a negative-rake carbide turning insert engineered for hardened steel machining in the HRC 40–60 range. With its 80° trigon geometry and a small 0.4 mm corner radius, this insert ensures high accuracy and fine surface finishes, making it ideal for semi-finishing and finishing operations. Its double-sided design provides six cutting edges per insert, delivering excellent cost efficiency and consistent performance in production environments.

Produced in the OS5105 grade, the insert combines a tough carbide substrate with a colorful CVD coating that offers outstanding wear resistance, thermal stability, and durability at lower cutting speeds required for hardened materials. The MM chipbreaker provides reliable chip evacuation, controlled cutting forces, and stable machining performance across a wide range of cutting parameters.

The WNMG 080404-MM OS5105 is compatible with standard negative-rake toolholders such as MWLNR and PWMWN, ensuring versatility in setup. It is widely used in mold making, automotive, and general engineering industries, where machining hardened steels with precision and stability is essential.

Code Breakdown:

• W – Insert shape: 80° trigon (truncated triangle)

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

• M – Tolerance class (medium)

• G – Insert with hole and chipbreaker

• 08 – Insert size: 8 mm inscribed circle

• 04 – Insert thickness: 4.76 mm

• 04 – Corner radius: 0.4 mm

• MM – Chipbreaker for general steel machining

• OS5105 – CVD-coated grade for hardened steels

Key Features:

• WNMG-style 80° trigon insert, double-sided

• Size: IC 8 mm, thickness 4.76 mm, radius 0.4 mm

• Grade OS5105 – colorful CVD coating, wear resistant

• MM chipbreaker – optimized for steel machining

• Six cutting edges for cost efficiency

• Negative rake design for edge strength and durability

• Fits holders: MWLNR, PWMWN, and similar types

• Best for hardened steels HRC 40–60

Grade Information (OS5105):

• Coating: CVD, colorful

• Application: Turning of hardened steels

• Best for: Semi-finishing and finishing operations

• Material hardness: HRC 40–60

• Cutting speed: 60–150 m/min