Sandvik Coromant 8021127 Dnmg 15 04 12-MR 4415 Turning Insert

Product Description

The SANDVIK COROMANT 8021127 is a DNMG-style carbide turning insert designed for steel machining in both roughing and medium machining operations. Carrying the ISO code DNMG 15 04 12-MR 4415, this insert features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN that delivers high wear resistance with maintained toughness — the Grade 4415 characteristic that makes it effective across a wide range of steel (ISO P) workpiece materials. The insert has a 55-degree diamond (rhombic) shape, a 0.5000-inch inscribed circle, and a 0.0469-inch corner radius. It is held by clamp or screw and suited for use by machinists and CNC lathe operators running production or job-shop turning work.

This insert is intended for turning applications on steel and secondary use on cast iron (ISO K) workpiece materials. The MR chip breaker geometry is optimized for roughing and medium machining, making it a practical choice for interrupted cuts, scaled surfaces, and general-purpose stock removal passes. The neutral hand orientation allows use in standard right-hand and left-hand toolholders designed for DNMG geometry inserts.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear resistance and thermal protection
• Grade 4415 — high to moderate wear resistance with toughness for steel (ISO P) applications
• 55-degree diamond insert shape (D) with 0.0469-inch corner radius for versatile turning profiles
• MR chip breaker geometry rated for roughing and medium machining operations
• Negative side clearance (N-type) with M tolerance for reliable seating in DNMG toolholders
• Compatible with clamp and screw insert holding methods

Compatibility

Designed for use in DNMG-style turning toolholders that accept the ANSI size code 433 (ISO size code 150412) insert geometry. Primary workpiece material is steel (ISO P); secondary application is cast iron (ISO K) per the grade classification of this insert series.

Installation Notes

Installation is performed by a machinist or CNC setup technician. Power down and lock out the machine before indexing or replacing inserts. Seat the insert fully in the pocket before engaging the clamp or screw, and verify torque per the toolholder manufacturer specification — do not overtighten the clamping screw. Inspect the insert pocket and shim for damage or debris before each insert change to ensure accurate seating and prevent premature edge failure.