Kennametal 1157889 Milling Insert SPCH090308T KC725M

Product Description

The KENNAMETAL 1157889 is a solid carbide milling insert in the SPCH series, designed for indexable milling applications in demanding metal-cutting environments. The insert carries a PVD-applied TiN/TiCN/TiN multilayer coating under manufacturer grade KC725M, which targets steel, stainless steel, superalloys, and titanium workpiece materials. The square SPCH090308T geometry features a 90-degree included angle, a neutral hand orientation, and a 0.0313-inch corner radius. At 0.1252 inches thick with a 0.5000-inch inscribed circle, it fits standard screw-held toolholders sized for the SPCH insert series. Licensed machinists and CNC setup technicians are the primary installers of this insert.

This insert is suited for roughing and semi-finishing milling passes on steel (P-grade), stainless steel (M-grade), superalloys, and titanium (S-grade) workpieces. It performs in both horizontal and vertical milling setups where a square insert profile and positive relief angle are appropriate. The size code 322 and ISO designation SPCH090308T place it in a well-established toolholder family used across production machining, job shops, and aerospace component work. The T chip breaker geometry assists with chip control across the primary workpiece material range.

Key Features

• PVD-coated TiN/TiCN/TiN multilayer coating for wear resistance across steel and superalloy cuts
• Solid carbide substrate in manufacturer grade KC725M rated for C5, C6, and C7 material groups
• Square insert shape with 90-degree included angle and neutral hand for versatile milling orientations
• 0.0313-inch corner radius for controlled edge engagement and surface finish
• Screw-held mounting method for secure, repeatable insert indexing
• T chip breaker geometry suited to steel, stainless steel, superalloys, and titanium applications

Compatibility

Designed as an OEM-style replacement for indexable milling toolholders that accept SPCH-series square inserts with ISO designation SPCH090308T and a 0.1563-inch hole diameter.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the spindle before changing inserts. Use the correct torque screwdriver specified by the toolholder manufacturer for the insert clamping screw — do not overtighten or use impact tools. Inspect the toolholder pocket seating surface and screw threads for wear or debris before seating the replacement insert.