Kennametal 1157544 Milling Insert SPEB090308 KC730 Carbide

Product Description

The KENNAMETAL 1157544 is a solid carbide milling insert in the SPEB series, designed for high-performance metal removal in milling applications. It carries the KC730 manufacturer grade and features a physical vapor deposition (PVD) titanium nitride (TiN) coating for improved wear resistance and thermal stability. The insert has a square shape with a 90-degree included angle, a neutral hand orientation, and a corner radius of 0.0315 inches (0.80 mm). It measures 0.1252 inches thick and has an inscribed circle diameter of 0.5000 inches. This insert is mounted via screw-hold and suits material grades C2, C3, and C4. It is installed and replaced by machinists and CNC tooling technicians.

The KENNAMETAL 1157544 SPEB090308 insert fits milling cutter bodies that accept SPEB-series screw-on indexable inserts. It is suited for machining medium to hard ferrous and non-ferrous materials across C2, C3, and C4 material grade classifications. Typical applications include face milling, shoulder milling, and general-purpose milling on vertical machining centers, horizontal machining centers, and manual knee mills. The maximum depth of cut is 0.5000 inches. The relief angle of 11 degrees supports free-cutting action in a range of workpiece materials.

Key Features

• KC730 grade solid carbide construction with PVD TiN coating for extended tool life
• Square insert shape with 90-degree included angle for versatile milling geometry
• Corner radius of 0.0315 inches (0.80 mm) for controlled edge finishing
• Neutral hand orientation compatible with both right-hand and left-hand cutter bodies
• Screw-hold mounting method for secure, repeatable indexing
• Maximum depth of cut of 0.5000 inches suitable for moderate to aggressive passes

Compatibility

Designed as an OEM-style replacement for SPEB-series indexable milling cutter bodies that accept screw-held square inserts with a 0.5000-inch inscribed circle and SPEB090308 ISO code geometry.

Installation Notes

Installation is performed by machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate Torx or hex key specified by the cutter body manufacturer to secure the mounting screw — do not overtighten, as this can crack the carbide insert. Inspect the cutter body pocket seating surface for chips or debris before installing a new insert to ensure proper seating and runout.