TNMG 160404-MM OS5105 Carbide Turning Insert

The TNMG 160404-MM OS5105 is a negative-rake carbide turning insert designed for finishing and semi-finishing operations on CNC and conventional lathes. With its 60° triangular geometry, it provides excellent edge stability and cost efficiency, offering six cutting edges per insert. The 0.4 mm corner radius ensures fine surface finishes and dimensional accuracy, making it suitable for applications where precision is critical.

Manufactured in the OS5105 grade, this insert combines a fine-grained carbide substrate with a copper-colored PVD coating that delivers high wear resistance and outstanding thermal stability. It is particularly effective when machining medium- to high-carbon steels, spring steels, manganese steels, and other medium-hardness alloys. The MM chipbreaker is optimized for medium to finishing cuts, offering smooth chip evacuation, reduced cutting forces, and consistent surface quality.

The TNMG 160404-MM OS5105 is compatible with MTJNR and TTJNR holders, designed for triangular inserts. It is widely applied in automotive, forging, and engineering industries, especially for machining medium-hardness steels where durability and surface quality are essential.

Code Breakdown:

• T – Insert shape: 60° triangular

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

• M – Tolerance class (medium)

• G – Insert with hole and chipbreaker

• 16 – Insert size: 16 mm

• 04 – Insert thickness: 4.76 mm

• 04 – Corner radius: 0.4 mm

• MM – Chipbreaker for medium to finishing operations

• OS5105 – Grade optimized for medium- to high-carbon steels

Key Features:

• TNMG-style 60° triangular carbide turning insert

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

• OS5105 grade – wear resistance and heat stability for medium-hard steels

• MM chipbreaker for smooth finishing and chip control

• Negative rake geometry for strength and stability

• Six cutting edges for cost efficiency

• Fits holders: MTJNR, TTJNR

• Best for medium- to high-carbon and spring steels

Grade Information (OS5105):

• Coating: PVD, copper color

• Application: turning and milling of medium- to high-carbon steels, spring steels, manganese steels

• Best for: machining medium-hardness steels (alloy and forged steels)

• Material hardness: 30 < HRC < 50

• Cutting speed: 80–200 m/min