WNMG 080408-TMA OS8126 Carbide Turning Insert

The WNMG 080408-TMA OS8126 is a negative-rake carbide turning insert designed for high-performance machining of steels and stainless steels under medium to finishing conditions. With its 80° trigon geometry and 0.8 mm corner radius, it provides a balance of cutting edge strength and surface finish quality. The larger nose radius enhances tool stability, allows for higher feed rates, and contributes to improved dimensional accuracy during semi-finishing operations.

Manufactured in the OS8126 grade, the insert features a PVD coating over a fine-grain carbide substrate. This grade is engineered to deliver excellent wear resistance, oxidation resistance, and toughness, making it suitable for demanding applications on steels and stainless steels. The TMA chipbreaker is optimized for smooth chip evacuation and reduced cutting forces, ensuring stable performance in both continuous and slightly interrupted cuts.

The WNMG 080408-TMA OS8126 fits standard negative-rake toolholders such as MWLNR and PWMWN, providing six cutting edges per insert for cost efficiency. It is widely applied in automotive, aerospace, and mold-making industries where long tool life and consistent surface quality are required.

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

• TMA – Chipbreaker for medium to finishing applications

• OS8126 – PVD-coated grade for steels and stainless steels

Key Features:

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

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

• Grade OS8126 – PVD coating for wear resistance and toughness

• TMA chipbreaker – optimized for medium to finishing cuts

• Six cutting edges per insert for cost efficiency

• Negative rake design for strength and stability

• Fits holders: MWLNR, PWMWN, and similar types

• Ideal for steels and stainless steels

Grade Information (OS8126):

• Coating: PVD

• Application: Turning of steels and stainless steels

• Best for: Semi-finishing and finishing operations

• Material hardness: HRC <35

• Cutting speed: 150–250 m/min