Kennametal 4050524 NPGR51 KCU25 Carbide Profiling Insert

Product Description

The KENNAMETAL 4050524 is a solid carbide profiling and turning insert in the NPGR51 style, rated to the KCU25 manufacturer grade with an AlTiN PVD coating. Designed for left-hand cutting operations, this parallelogram-shaped insert features a positive rake angle of 10 degrees, an 8-degree relief angle, and a 55-degree included angle. It measures 0.375 inches in length, 0.25 inches in width, and 0.125 inches in thickness, with a corner radius of 0.0156 inches (0.40 mm). Two cutting edges are provided per insert. This insert is installed using a clamp-style holding method and is suited for use by machinists and CNC turning specialists on production and job-shop equipment.

The 4050524 is engineered for profiling and turning applications across a wide range of workpiece materials including steel, stainless steel, cast iron, non-ferrous metals, and superalloys and titanium. Its fine-grain carbide substrate and PVD AlTiN coating support consistent performance in both roughing and finishing passes where profile accuracy is required. The common chipbreaker geometry helps manage chip flow across varying depths of cut up to 0.125 inches. This insert is part of the Top Notch series and carries the ISO code KCGR110304L08, conforming to NPGR51L and KCGR110304L08 standards.

Key Features

• AlTiN PVD coating for extended tool life in steel, stainless, cast iron, non-ferrous metals, and superalloys
• Fine-grain solid carbide substrate in KCU25 grade for toughness and wear resistance
• Positive rake angle (10 degrees) reduces cutting forces and heat generation
• Left-hand cutting orientation with clamp-style insert holding
• Two usable cutting edges per insert for improved value per insert
• Maximum depth of cut of 0.125 inches with a 0.0156-inch corner radius for precise profiling

Compatibility

Designed as a Top Notch series replacement insert conforming to NPGR51L and ISO KCGR110304L08 standards. Compatible with clamp-style toolholders designed for NPGR51 left-hand inserts.

Installation Notes

Installation is performed by qualified machinists or CNC technicians. Always power down and lock out the machine spindle before seating or replacing inserts. Use the correct clamp and torx or hex key specified for the Top Notch toolholder to secure the insert without overtightening. Inspect the insert pocket and clamp seating surfaces for debris or wear before installation to ensure proper insert contact and dimensional accuracy.