Sandvik Coromant 6428031 R300 Milling Insert Solid Carbide

Product Description

The SANDVIK COROMANT 6428031 is a round, solid carbide milling insert designed for use in the R300 series milling system. It carries a CVD-applied triple-layer coating of TiCN, Al2O3, and TiN under manufacturer grade 3330, delivering wear resistance and thermal stability suited to interrupted and continuous cuts in cast iron. The insert measures 0.3150 inches in inscribed circle diameter and 0.1094 inches thick, with a 0.1575-inch corner radius and a positive rake geometry. Four cutting edges are available per insert, maximizing tool life per unit cost. This insert is installed by machinists and tooling technicians on CNC milling and turning centers.

This insert is engineered for primary use in cast iron workpiece materials, corresponding to material application code K. It is designed for the R300 cutter series and is compatible with cutter bodies in the A10K, A12M, A16K, A20M, and R300 series. Typical applications include face milling, shoulder milling, and light ramping operations in production environments where controlled chip formation in gray or nodular cast iron is required. The KH chip breaker geometry supports stable cutting in these materials at moderate to high feed rates.

Key Features

• Round insert shape with 360-degree included angle and 4 available cutting edges for maximum index count
• CVD-applied TiCN, Al2O3, and TiN triple-layer coating for heat and wear resistance in cast iron machining
• KH chip breaker with positive rake and 15-degree relief angle for stable, low-force cutting
• Maximum depth of cut of 0.1575 inches (4.00 mm) with a 0.1575-inch convex radius
• Neutral hand orientation allows use in standard right-hand and left-hand tooling configurations
• Screw-held mounting method ensures secure, repeatable insert positioning in compatible cutter bodies

Compatibility

Designed for use with R300 series cutter bodies, including compatible cutter body designations A10K, A12M, A16K, A20M, and R300. ANSI and ISO codes for this insert are R300-0828M-KH 3330.

Installation Notes

Installation is performed by qualified tooling technicians or machinists. Power down and lock out the spindle before indexing or replacing inserts. Use the appropriate Torx or hex key for the clamping screw as specified by the cutter body documentation — do not overtighten or substitute fasteners. Inspect the insert pocket and clamping screw for wear or contamination before seating a new insert.