Kennametal 4050448 Turning Insert VBGT331HP KCU25 Carbide

Product Description

The KENNAMETAL 4050448 is a VBGT331HP carbide turning insert with KCU25 grade and an AlTiN PVD coating. It features a 35-degree diamond (rhombic) shape with a neutral hand orientation and screw-on holding method. The insert measures 1.3076 inches in length with a 0.3750-inch inscribed circle and a 0.0156-inch corner radius. With a positive rake angle of 15 degrees, a 5-degree relief angle, and a honed cutting edge, it is engineered for finishing operations. The KCU25 grade provides moderate wear resistance and toughness across a broad range of workpiece materials. Licensed machinists and CNC turning specialists are the primary installers.

This insert is suited for turning, facing, boring, back turning, and back boring operations on steel, stainless steel, cast iron, aluminum and non-ferrous metals, and superalloys including titanium. It is designed for finishing passes where surface finish and dimensional control are critical. The HP chip breaker geometry is optimized for light to moderate depths of cut with maximum depth of cut reaching 0.4354 inches. It conforms to ANSI insert code VBGT331 and ISO insert code VBGT160404, making it compatible with standard VBGT-style screw-on toolholders used on CNC lathes and turning centers in both production and job-shop environments.

Key Features

• KCU25 grade with AlTiN PVD coating for moderate wear resistance and toughness on steel, stainless, cast iron, non-ferrous, and superalloys
• 35-degree diamond insert shape with HP chip breaker geometry optimized for finishing operations
• Positive rake angle (15 degrees) and positive side clearance reduce cutting forces during light finishing cuts
• Honed cutting edge style improves edge stability and surface finish on difficult-to-machine materials
• 2 cutting edges per insert for cost efficiency in production environments
• Conforms to ANSI VBGT331 and ISO VBGT160404 standards for broad toolholder compatibility

Compatibility

Designed to fit standard screw-on VBGT-style toolholders conforming to ANSI VBGT331 and ISO VBGT160404 specifications. Suitable for use on CNC lathes and turning centers machining steel, stainless steel, cast iron, aluminum and non-ferrous alloys, and superalloys and titanium (ISO material codes P, M, K, N, and S). Multi-use application includes turning, facing, boring, back turning, and back boring.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. Always power down and lock out the machine spindle before changing inserts. Seat the insert fully against the toolholder pocket locating surfaces before tightening the clamping screw to avoid insert rocking or premature edge failure. Inspect the toolholder pocket seating surface for chips or debris prior to seating a new insert.