Sumitomo 12RJ741 TPG431 AC820P Carbide Turning Insert

Product Description

The SUMITOMO 12RJ741 is a solid carbide turning insert in the TPG431 style, designed for precision external and internal turning operations on CNC lathes and manual turning centers. It features a triangular insert shape with a 60-degree included angle, a 1/2 inch inscribed circle, and a 1/64 inch corner radius. The AC820P manufacturer grade is applied with an Al2O3 (aluminum oxide) CVD coating, providing thermal resistance and wear protection during steel turning. Insert thickness is 3/16 inch. The clamp-style holding method suits standard TPG toolholders used by machinists and toolroom technicians.

This insert is suited for turning operations where the primary workpiece material is steel. The positive rake geometry and 11-degree relief angle (clearance code P) reduce cutting forces on the workpiece, making it well suited for finishing and light to medium roughing passes. The ANSI code is TPG431 and the ISO code is TPGN220404, allowing cross-referencing to compatible toolholder systems. It is a single-insert package appropriate for toolroom replenishment or maintenance stocking.

Key Features

• Solid carbide construction with CVD-applied Al2O3 coating for wear resistance in steel turning
• Triangular insert shape with 60-degree included angle and positive rake geometry
• 11-degree relief angle (clearance code P) reduces cutting forces
• 1/2 inch inscribed circle and 1/64 inch corner radius for controlled finishing cuts
• ANSI code TPG431 and ISO code TPGN220404 for broad toolholder compatibility reference
• Clamp-style holding method compatible with standard TPG insert pockets

Compatibility

Designed for use in TPG-style clamp toolholders accepting a 431 insert size with a triangular pocket. ANSI code TPG431 and ISO code TPGN220404 can be used to verify fitment with compatible toolholder systems. Primary workpiece material compatibility is steel (ISO material code P).

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's torque and clamping procedures. Ensure the insert pocket is clean and free of chips before seating. Power down and lock out the machine before changing inserts. Follow applicable shop safety standards and machine manufacturer guidelines when indexing or replacing cutting inserts.