The TNMG 160408-HM OS8225 is a negative-rake carbide turning insert designed for medium machining operations on CNC and conventional lathes. Its 60° triangular geometry offers excellent strength and multiple cutting edges, making it highly cost-efficient. The 0.8 mm corner radius increases cutting edge durability, allowing stable performance at higher feed rates while maintaining good surface quality.
Produced in the OS8225 grade, the insert combines toughness with wear resistance, delivering consistent results when machining steels under medium cutting conditions. The HM chipbreaker is optimized for medium machining, ensuring smooth chip flow, reduced cutting forces, and extended tool life during continuous operations.
The TNMG 160408-HM OS8225 is fully compatible with standard turning holders such as MTJNR and TTJNR, which are specifically designed for triangular inserts. It is widely used in automotive, mold making, and general engineering industries, where reliability, cost efficiency, and durability are critical in steel machining.
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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08 – Corner radius: 0.8 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 0.8 mm
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Grade OS8225 – wear resistance and toughness for steels
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HM chipbreaker for reliable medium machining
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Negative rake design for edge stability and tool life
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Fits holders: MTJNR, TTJNR
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Cost-efficient insert with six cutting edges
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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