WNMG 080404-TM OS8225 Carbide Turning Insert

The WNMG 080404-TM OS8225 is a negative-rake carbide turning insert designed for machining steels and stainless steels in medium cutting conditions. Featuring an 80° trigon geometry with a small 0.4 mm corner radius, it provides excellent dimensional accuracy and is especially suitable for semi-finishing and finishing operations. Its double-sided design offers six usable cutting edges per insert, ensuring high cost efficiency and reliable performance in production machining.

Manufactured in the OS8225 grade, the insert combines a fine-grained carbide substrate with a copper-colored PVD coating. This grade delivers a balanced combination of wear resistance and toughness, making it suitable for both continuous and slightly interrupted cutting of steels and stainless steels. The TM chipbreaker is optimized for medium machining, enabling efficient chip evacuation, stable cutting forces, and improved surface quality.

The WNMG 080404-TM OS8225 fits standard negative-rake holders such as MWLNR and PWMWN, making it a versatile solution for general engineering, automotive, and mold-making industries where stable tool life and process reliability are 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

• TM – Chipbreaker for medium machining

• OS8225 – 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 0.4 mm

• Grade OS8225 – copper-colored PVD coating

• TM chipbreaker – optimized for medium machining

• Six cutting edges for cost savings

• Negative rake design for strength and stability

• Fits holders: MWLNR, PWMWN, and similar types

• Best for steels and stainless steels

Grade Information (OS8225):

• Coating: PVD, copper color

• Application: General turning and milling of steels, stainless steels, cast irons

• Best for: Stainless steel turning and milling

• Material hardness: HRC <30

• Cutting speed: 120–220 m/min