TNMG 160404R OS8225 Carbide Turning Insert

The TNMG 160404R OS8225 is a right-hand, negative-rake carbide turning insert designed for precision machining in CNC and conventional lathes. Its 60° triangular geometry provides excellent edge strength and six available cutting edges, offering high cost efficiency. The 0.4 mm corner radius ensures accurate finishing, dimensional stability, and fine surface quality, making it suitable for medium machining applications where precision is critical.

Manufactured in OS8225 grade, this insert delivers a strong balance between wear resistance and toughness, specifically optimized for machining steels under medium cutting conditions. Its PVD black coating provides durability and stable performance at higher cutting speeds. The right-hand cutting configuration improves chip flow and tool positioning in external turning operations.

The TNMG 160404R OS8225 is compatible with standard MTJNR and TTJNR holders, designed for 60° triangular inserts. It is commonly used in automotive, aerospace, and general engineering industries for medium machining of steels, where accuracy, tool life, and cost efficiency are required.

Code Breakdown:

• T – Insert shape: 60° triangular

• N – Clearance angle: 0° (negative rake)

• M – Tolerance class (medium)

• G – Insert with hole

• 16 – Insert size: 16 mm

• 04 – Insert thickness: 4.76 mm

• 04 – Corner radius: 0.4 mm

• R – Right-hand cutting insert

• OS8225 – Grade optimized for steels

Key Features:

• TNMG-style 60° triangular carbide insert

• Right-hand cutting configuration (R)

• Size: 16×16 mm, thickness 4.76 mm, radius 0.4 mm

• OS8225 grade – wear resistance and toughness for steels

• Six cutting edges for cost efficiency

• Negative rake geometry for durability

• Fits holders: MTJNR, TTJNR

• Best for precision medium machining of steels

Grade Information (OS8225):

• Coating: PVD, black color

• Application: turning and milling of steels (general purpose), also usable on stainless steels

• Best for: medium machining of steels

• Material hardness: HRC <30

• Cutting speed: 180–250 m/min