WNMG 080408-MF3 OS9201S Carbide Turning Insert

The WNMG 080408-MF3 OS9201S is a negative-rake carbide turning insert designed for efficient machining of stainless steels. With its 80° trigon (truncated triangle) geometry and a 0.8 mm corner radius, this insert combines edge strength with good surface finish capabilities. The double-sided design provides six cutting edges per insert, offering excellent cost efficiency for production environments.

Manufactured in the OS9201S grade, it features a PVD-coated fine-grain carbide substrate with optimized toughness and thermal stability. The coating enhances resistance to wear and oxidation, ensuring long tool life even under unstable cutting conditions or high-temperature stainless steel machining. The MF3 chipbreaker is specifically engineered for stainless steel, providing smooth chip evacuation, reduced cutting forces, and stable surface quality during both continuous and interrupted cutting.

The WNMG 080408-MF3 OS9201S is compatible with standard external turning toolholders such as MWLNR and PWMWN types, making it versatile for use in general engineering, food-processing equipment, and automotive industries where stainless steel machining performance is critical.

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

• 08 – Corner radius: 0.8 mm

• MF3 – Chipbreaker optimized for stainless steel machining

• OS9201S – PVD-coated grade for stainless steels

Key Features:

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

• Size: IC 8 mm, thickness 4.76 mm, radius 0.8 mm

• Grade OS9201S – PVD-coated, wear-resistant, tough substrate

• MF3 chipbreaker – excellent chip control for stainless steel

• Six cutting edges for cost efficiency

• Negative rake for strength and stability

• Fits holders: MWLNR, PWMWN, and similar types

• Best for stainless steel turning applications

Grade Information (OS9201S):

• Coating: PVD

• Application: Turning of stainless steels

• Best for: Semi-finishing stainless steel under stable and unstable conditions

• Material hardness: HRC <35 (stainless steels)

• Cutting speed: 120–220 m/min