CCMT 09T304-MF3 OS5105 Carbide Turning Insert

The CCMT 09T304-MF3 OS5105 is a positive-rake carbide turning insert designed for finishing and semi-finishing applications on CNC and conventional lathes. Its 80° diamond (C-shape) geometry with a positive clearance angle ensures smooth cutting and reduced cutting forces, while the 0.4 mm corner radius delivers precision and excellent surface quality, making it ideal for high-accuracy jobs.

Manufactured in OS5105 grade, the insert is built on a fine-grained carbide substrate with a copper-colored PVD coating. This combination provides high wear resistance and strong thermal stability, making it an excellent choice for machining medium- to high-carbon steels, spring steels, and manganese steels with hardness levels up to HRC 50. The MF3 chipbreaker is engineered for semi-finishing operations, ensuring stable chip evacuation, reduced tool wear, and smooth surface finishes.

The CCMT 09T304-MF3 OS5105 is compatible with SCLCR and SCBCR tool holders, which are designed for positive-rake C-shaped inserts. It is widely applied in automotive, mold making, and general engineering industries, especially in machining medium-hard steels.

Code Breakdown:

• C – Insert shape: 80° diamond

• C – Clearance angle: 7° (positive rake)

• M – Tolerance class (medium)

• T – Insert with hole and chipbreaker

• 09 – Insert size: 9 mm

• T3 – Insert thickness: 3.97 mm

• 04 – Corner radius: 0.4 mm

• MF3 – Chipbreaker for semi-finishing

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

Key Features:

• CCMT-style 80° diamond positive-rake insert

• Size: 9 mm, thickness 3.97 mm, radius 0.4 mm

• OS5105 grade – high wear resistance and thermal stability

• MF3 chipbreaker for semi-finishing and chip control

• Positive rake for smoother cutting and accuracy

• Fits holders: SCLCR, SCBCR

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

Grade Information (OS5105):

• Coating: PVD, Nano Blue coating

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

• Best for: machining medium-hardness steels

• Material hardness: 30 < HRC < 50

• Cutting speed: 80–200 m/min