Kennametal 1157494 RPGB09T300 Round Milling Insert KC725M

Product Description

The KENNAMETAL 1157494 is a round solid carbide milling insert carrying ISO designation RPGB09T300 and manufacturer grade KC725M. It features a three-layer PVD coating stack of TiN, TiCN, and TiN applied over a solid carbide substrate, delivering wear resistance and thermal stability across demanding cutting applications. The insert measures 3/8 inches in inscribed circle diameter and 5/32 inches thick, with an 11-degree relief angle and a neutral hand orientation. A center-screw holding method locks the insert securely in the toolholder. This insert is used by machinists and tooling specialists in CNC milling operations targeting steel, stainless steel, superalloys, and titanium workpiece materials.

This insert is suited for milling operations in both production shop and job-shop environments where steel (ISO P), stainless steel (ISO M), and superalloys or titanium (ISO S) are the primary workpiece materials. The RPGB series round insert geometry provides a continuous cutting edge that distributes cutting forces evenly, making it well-suited for profiling, copy milling, and light-to-medium stock removal passes. It fits toolholders designed for the RPGB09T300 insert pocket geometry. Typical applications include aerospace component work involving titanium and nickel-based superalloys as well as general-purpose stainless and alloy steel milling.

Key Features

• Solid carbide substrate with PVD-applied TiN / TiCN / TiN multilayer coating for heat and wear resistance
• Round RPGB insert shape with continuous cutting edge for profile and copy milling
• 11-degree relief angle reduces cutting forces and minimizes workpiece heat buildup
• Neutral hand orientation fits both right-hand and left-hand toolholder pockets
• Screw-clamp holding method provides positive insert location and repeatable indexing
• Rated for ISO P, M, and S material grades covering steel, stainless steel, superalloys, and titanium

Compatibility

Designed for use in toolholders with RPGB09T300-style insert pockets. Compatible workpiece materials include steel, stainless steel, superalloys, and titanium per ISO material codes P, M, and S. Refer to the KENNAMETAL toolholder catalog to confirm pocket geometry and screw-clamp hardware before ordering.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or tooling technician with the spindle fully stopped and the machine in a locked-out, de-energized state. Use the correct torque driver for the screw-clamp fastener as specified by the toolholder manufacturer — do not over-torque or use makeshift tools. Inspect the insert pocket seat and clamping screw for debris or damage before seating a new insert. Follow the toolholder manufacturer's setup sheet for proper insert orientation and projection.