The TNMG 160404-HM OS8225 is a negative-rake carbide turning insert designed for precision medium machining on CNC and manual lathes. With its 60° triangular geometry, it provides high edge strength and six available cutting edges, making it a cost-effective solution for production environments. The 0.4 mm corner radius enables excellent dimensional accuracy and fine surface finishes, making it ideal for applications where precision is essential.
Manufactured in OS8225 grade, the insert offers a balanced combination of wear resistance and toughness, ensuring reliable performance when machining steels. The HM chipbreaker is designed for medium machining, providing stable chip evacuation, smooth cutting action, and reduced tool wear under continuous cutting conditions.
The TNMG 160404-HM OS8225 is compatible with MTJNR and TTJNR tool holders, designed specifically for triangular inserts. This insert is widely used in the automotive, aerospace, and general engineering industries where accuracy, stability, and efficiency are required in medium machining of steels.
Code Breakdown:
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T – Insert shape: 60° triangular
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N – Clearance angle: 0° (negative rake)
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M – Tolerance class (medium)
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G – Insert with hole and chipbreaker
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16 – Insert size: 16 mm
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04 – Insert thickness: 4.76 mm
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04 – Corner radius: 0.4 mm
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HM – Chipbreaker for medium machining
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OS8225 – Grade optimized for steels
Key Features:
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TNMG-style 60° triangular carbide turning insert
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Size: 16×16 mm, thickness 4.76 mm, radius 0.4 mm
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Grade OS8225 – toughness and wear resistance for steels
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HM chipbreaker for chip control and medium machining
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Negative rake design for strength and stability
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Fits holders: MTJNR, TTJNR
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Six cutting edges for cost efficiency
Grade Information (OS8225):
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Coating: PVD, black color
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Application: turning and milling of steels (general purpose), also usable on stainless steels
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Best for: medium machining of steels
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Material hardness: HRC <30
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Cutting speed: 180–250 m/min
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