Sandvik Coromant 5915043 CNMG431-SM 1125 Turning Insert

Product Description

The SANDVIK COROMANT 5915043 is a CNMG431-SM 1125 series turning insert designed for precision metal removal in demanding CNC lathe and turning center applications. This solid carbide insert features a TiAlN and AlCr2O3 dual-layer coating applied via PVD process, providing thermal resistance and edge wear protection at elevated cutting speeds. The 80-degree diamond (C) insert shape delivers a strong cutting geometry, while the SM chip breaker geometry is engineered specifically for controlled chip formation in difficult-to-machine materials. The neutral hand orientation suits a wide range of tool holders. Licensed HVAC techs and electricians will not be the ones installing this part — this insert is specified and installed by CNC machinists and tooling engineers.

This insert is suited for turning stainless steel as its primary workpiece material, with secondary suitability for superalloys and titanium. These are materials that demand both edge toughness and heat-resistant coatings to maintain dimensional accuracy and surface finish. The SM chip breaker geometry and 1125 grade combination are optimized for medium to semi-finishing passes on these work materials. It is commonly used in aerospace, medical, oil and gas, and food-processing component production where stainless and high-temp alloys are prevalent. The insert fits standard CNMG-style tool holders using clamp and pin holding methods, making it compatible with a broad inventory of existing turning tool bodies on the shop floor.

Key Features

• TiAlN and AlCr2O3 dual-layer PVD coating for heat resistance and extended tool life on hard-to-machine alloys
• SM chip breaker geometry optimized for stainless steel, superalloy, and titanium turning
• 80-degree diamond insert shape (C) provides strong nose geometry and good workpiece access
• 4 cutting edges per insert for maximum economy per unit cost
• Neutral hand insert — compatible with both left- and right-hand tool holder setups
• Part of the T-Max P series, designed for secure clamping and consistent repeatability in production turning

Compatibility

Designed for use in CNMG-style turning tool holders using clamp and pin holding methods. ISO code CNMG 12 04 04-SM 1125. Compatible with tool holders accepting a 1/2-inch inscribed circle, 3/16-inch thick CNMG insert with a 1/64-inch corner radius. Confirm holder specification against ISO insert size code 431 before installation.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine spindle before changing inserts. Use the appropriate torque wrench and clamp hardware specified by the tool holder manufacturer — do not over-tighten the clamp screw as this can fracture the carbide substrate. Inspect the pocket seating surface and shim for damage before seating a new insert to ensure proper indexing and edge repeatability.