Kennametal 3957966 Milling Insert KCPM20 Solid Carbide

Product Description

The KENNAMETAL 3957966 is a solid carbide milling insert in the SDPT series, designed for indexable milling operations in demanding metal-cutting applications. This square insert carries the KCPM20 manufacturer grade and features a multilayer CVD coating stack of TiN, MT-TiCN, and Al2O3, providing wear resistance and thermal stability across a range of workpiece materials. The insert measures 0.1875 inches thick with a 0.5 inch inscribed circle and a 1/32 inch corner radius. The right-hand cutting configuration and honed T-Land cutting edge geometry suit high-feed and moderate-depth milling passes. Installation is by screw-holding method.

This insert is suited for milling steel, stainless steel, cast iron, and hard materials, corresponding to ISO material groups P, M, K, and H. It is a practical choice for shop environments where wear-resistant tooling is needed on difficult-to-machine alloys or hardened workpieces. The 15-degree relief angle supports clean chip evacuation and reduced cutting forces. It is sold individually and is appropriate for professional machinists and tooling technicians running indexable milling cutters that accept the SDPT1204 insert footprint.

Key Features

• KCPM20 carbide grade with CVD multilayer coating: TiN, MT-TiCN, and Al2O3 for extended tool life
• Square insert shape with 90-degree included angle and honed T-Land cutting edge
• Right-hand insert orientation with screw-clamp holding method
• 0.5 inch inscribed circle and 0.1875 inch thickness for dimensional consistency in the SDPT series
• 1/32 inch corner radius (0.0313 decimal inch) for general-purpose milling profiles
• Rated for steel, stainless steel, cast iron, and hard materials (ISO P, M, K, H)

Compatibility

Designed as a replacement-style milling insert for indexable milling cutter bodies that accept SDPT1204 series inserts. ISO code SDPT1204PDSRGB2 identifies the full insert specification for matching to compatible toolholders.

Installation Notes

Milling inserts of this type are installed and replaced by qualified machinists or tooling technicians. Before changing inserts, power down the spindle completely and follow lockout/tagout procedures per applicable shop safety standards. Use the correct torx or hex key to the cutter body manufacturer's specified procedure when seating the screw-clamp. Inspect the insert pocket and seating surface for chips or debris before installing the new insert to ensure proper seating and runout.