Seco 03276201 DCMT21.51-MF2 TM3501 Turning Insert Carbide

Product Description

The SECO 03276201 is a DCMT-style solid carbide turning insert designed for precision metal cutting in CNC and manual lathe operations. Carrying the DCMT21.51-MF2 industry standard designation and manufacturer grade TM3501, this insert features a multilayer CVD-applied Duratomic coating consisting of TiCN, Al2O3, and Cr for extended tool life in demanding cuts. The 55-degree diamond insert shape provides a sharp, versatile geometry suited to contour turning and profiling. With an MF2 chip breaker and a positive rake angle of 18 degrees, the insert is engineered to handle light-to-medium cuts on difficult-to-machine materials with minimal heat buildup and consistent chip formation.

This insert is primarily rated for stainless steel (ISO material code M, grades M30 and M40) and secondarily for steel (ISO material code P). It is suited for back turning, boring, facing, and general OD turning applications in both production and job-shop environments. The neutral hand orientation makes it usable in standard right-hand toolholders across a wide range of DCMT-compatible boring bars and turning tool bodies. Licensed machinists and CNC operators working in aerospace, medical, and general manufacturing will encounter this insert in high-tolerance finishing and semi-finishing passes where controlled chip evacuation is critical.

Key Features

• Duratomic CVD multilayer coating (TiCN, Al2O3, Cr) for wear resistance on stainless and steel
• 55-degree diamond insert shape with chamfered and honed cutting edge for clean entry and edge stability
• MF2 chip breaker geometry optimized for light finishing and medium semi-finishing cuts
• Positive rake angle (18 degrees) reduces cutting forces on work-hardening materials
• Two usable cutting edges per insert; screw-lock insert holding method for rigid clamping
• Compliant with ANSI and ISO standards; ISO code DCMT070204-MF2

Compatibility

Designed as an OEM-style replacement and standard-stock turning insert for DCMT-series toolholders accepting a 55-degree diamond insert with a 1/4-inch inscribed circle and screw-lock holding. Compatible with toolholders conforming to ANSI and ISO DCMT070204 specifications.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Always power down and lock out the machine before indexing or replacing inserts. Use the correct torque wrench and manufacturer-specified clamping screw to seat the insert fully against the pocket without overtightening, which can crack the carbide body. Inspect the insert pocket for wear, debris, or damage before seating a new insert to ensure proper contact and runout.