WNMG 080404-MF3 OS9201S Carbide Turning Insert

The WNMG 080404-MF3 OS9201S is a negative-rake carbide turning insert designed for stainless steel machining where precision and surface quality are critical. With its 80° trigon geometry and a small 0.4 mm corner radius, it offers high dimensional accuracy and is particularly suitable for semi-finishing and finishing operations. The double-sided design provides six cutting edges per insert, ensuring cost efficiency and consistent tool performance.

Produced in the OS9201S grade, this insert is built on a fine-grained carbide substrate with a PVD coating that provides excellent wear resistance, toughness, and thermal stability. This combination ensures reliable tool life even when machining stainless steels at varying speeds and cutting conditions. The MF3 chipbreaker is optimized for stainless steels, enabling smooth chip evacuation, reduced cutting forces, and a stable surface finish in both continuous and interrupted cutting.

The WNMG 080404-MF3 OS9201S is compatible with standard toolholders such as MWLNR and PWMWN, making it a versatile choice for general engineering, automotive, and food-processing applications where stainless steel machining demands both efficiency and accuracy.

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

• MF3 – Chipbreaker 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 0.4 mm

• Grade OS9201S – PVD coating, high toughness and wear resistance

• MF3 chipbreaker – optimized for stainless steel chip control

• Six cutting edges for cost efficiency

• Negative rake design for edge strength and stability

• Fits holders: MWLNR, PWMWN, and similar types

• Best for semi-finishing and finishing stainless steels

Grade Information (OS9201S):

• Coating: PVD

• Application: Turning of stainless steels

• Best for: Semi-finishing and finishing operations

• Material hardness: HRC <35

• Cutting speed: 120–220 m/min