Kennametal 4058551 Milling Insert KC725M Solid Carbide

Product Description

The KENNAMETAL 4058551 is a solid carbide milling insert carrying the ANSI/ISO designation LNEU1240R03SGP 4 in manufacturer grade KC725M. This single-sided, right-hand insert features a rectangular shape with a 90-degree included angle, a positive 30-degree rake angle, and a chamfered and honed cutting edge style. It measures 0.5000 inches in length, 0.3750 inches wide, and 0.1575 inches thick, with a 0.0118-inch corner radius. The TiAlN coating is applied via PVD process, delivering elevated heat resistance and wear performance. Four cutting edges are available per insert, making it an efficient choice for production milling operations. The insert is held in the cutter body by a screw-clamp method and is compatible with the LN cutter series.

This insert is engineered for milling steel, stainless steel, superalloys, and titanium workpieces, corresponding to ISO material groups P, M, and S. It suits applications where controlled chip formation and edge stability are critical, such as face milling, shoulder milling, and high-feed operations on ferrous and difficult-to-machine alloys in both general production and aerospace environments. The GP chip breaker geometry supports consistent chip control across a range of depths of cut and feed rates. Licensed machinists, tooling specialists, and CNC operators working in metalworking shops will find this insert sized for the LNEU insert series toolholders with a 3/8-inch inscribed circle.

Key Features

• Solid carbide substrate with TiAlN PVD coating for heat and wear resistance in demanding cuts
• Four usable cutting edges per insert for extended tooling economy
• 30-degree positive rake angle reduces cutting forces on steel and superalloy workpieces
• GP chip breaker geometry for consistent chip control at moderate to high feed rates
• Chamfered and honed cutting edge preparation for edge stability and reduced chipping
• Right-hand orientation with screw-clamp holding method for secure seating in LN-series bodies
• Meets ANSI and ISO dimensional standards under designation LNEU1240R03SGP 4

Compatibility

Designed for use in LN-series milling cutter bodies that accept LNEU-style inserts with a 3/8-inch inscribed circle. Rated for material grades C5, C6, and C7. Compatible with steel, stainless steel, superalloy, and titanium workpiece materials per ISO groups P, M, and S.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Always power down and lock out the machine spindle before seating or indexing inserts. Use the appropriate torx or hex key at the manufacturer-specified procedure to secure the clamping screw without over-torquing the insert pocket. Inspect the insert pocket and clamping screw for wear or debris before installing a new insert to ensure proper seating and edge repeatability.