CCMT 09T308-HMP OS8225 Carbide Turning Insert

The CCMT 09T308-HMP OS8225 is a positive-rake carbide turning insert engineered for semi-finishing and finishing operations in CNC and conventional lathes. Its 80° diamond (C-shape) geometry with a positive clearance angle ensures smooth cutting and low cutting forces, while the 0.8 mm corner radius strengthens the cutting edge. This design provides stability at higher feed rates, making the insert ideal for medium machining where durability and accuracy are required.

Made in OS8225 grade, this insert features a fine-grained carbide substrate with a black PVD coating that combines wear resistance with toughness. It is primarily optimized for machining steels, offering consistent tool life and reliable performance under medium cutting conditions. The HMP chipbreaker is designed for semi-finishing and finishing, ensuring effective chip evacuation, reduced cutting resistance, and improved surface quality.

The CCMT 09T308-HMP OS8225 is compatible with SCLCR and SCBCR holders, designed for positive-rake C-shaped inserts. It is widely used in automotive, mechanical, and general engineering industries for efficient and precise machining of 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

• 08 – Corner radius: 0.8 mm

• HMP – Chipbreaker for semi-finishing and finishing

• OS8225 – Grade optimized for steels

Key Features:

• CCMT-style 80° diamond positive-rake insert

• Size: 9 mm, thickness 3.97 mm, radius 0.8 mm

• OS8225 grade – wear-resistant black PVD coating for steels

• HMP chipbreaker for stable semi-finishing and finishing

• Positive rake for reduced forces and smooth machining

• Six cutting edges for cost efficiency

• Fits holders: SCLCR, SCBCR

• Best for medium machining of steels

Grade Information (OS8225):

• Coating: PVD, black color

• Application: turning and milling of steels (general purpose)

• Best for: medium machining of steels

• Material hardness: HRC <30

• Cutting speed: 180–250 m/min