CNMG 120404-MF3 OS9201S Carbide Turning Insert

The CNMG 120404-MF3 OS9201S is a negative-rake turning insert developed for medium finishing in CNC and manual lathes. Its 80° rhombic design provides rigidity and secure cutting, while the 0.4 mm corner radius allows for precise finishing operations with excellent surface quality.

The insert uses OS9201S grade, offering superior wear resistance and thermal stability. Combined with the MF3 chipbreaker, it ensures smooth chip evacuation, reduced cutting forces, and long tool life under stable machining conditions.

This insert is fully compatible with standard external turning tool holders, including MCLNR, PCLNR, and DCLNR types. It is especially recommended for finishing stainless steels, titanium alloys, and high-temperature alloys.

Code Breakdown:

• C – Insert shape: 80° rhombic

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

• M – Tolerance class (medium)

• G – Insert with hole and chipbreaker

• 12 – Insert size: 12 mm

• 04 – Thickness: 4.76 mm

• 04 – Corner radius: 0.4 mm

• MF3 – Chipbreaker for medium finishing

• OS9201S – Grade for stainless steels, titanium, and high-temp alloys

Key Features:

• CNMG-style 80° rhombic insert for finishing

• Corner radius 0.4 mm for accuracy

• MF3 chipbreaker for smooth chip flow

• OS9201S grade – high wear and heat resistance

• Negative rake for strength and stability

• Fits holders: MCLNR, PCLNR, DCLNR

• Ideal for finishing steels, stainless steels, and titanium alloys

Grade Information (OS9201S):

• Coating: PVD, silver color

• Application: semi-finishing of titanium alloys, high-temp alloys, stainless steels (304, 316)

• Best for: continuous cutting in stable conditions

• Material hardness: HRC <45

• Cutting speed: 40–220 m/min