Seco 03276686 TNMG432-MF4 TM3501 Carbide Turning Insert

Product Description

The SECO 03276686 is a TNMG432-MF4 grade TM3501 solid carbide turning insert designed for precision metal cutting in CNC and manual turning applications. It features a CVD-applied Duratomic multilayer coating of TiCN and Al2O3 with a chromium topcoat, delivering wear resistance and thermal stability during continuous and interrupted cuts. The triangular insert body provides 6 usable cutting edges, reducing per-edge tooling cost. With a 0.5-inch inscribed circle, 0.0315-inch corner radius, and a negative rake geometry, this insert suits medium to finishing passes on difficult materials. The MF4 chip breaker geometry controls chip flow across a range of feed rates and depths of cut.

This insert is intended for back turning, boring, facing, and general turning operations. Its primary workpiece material rating is stainless steel (ISO material code M), with a secondary rating for steel (ISO code P). Material grades M30 and M40 are applicable, making it suitable for medium-duty and semi-finishing work in production environments. Machinists and CNC operators in job shops and manufacturing facilities install this insert into compatible TNMG-style toolholders. The ISO designation for this insert is TNMG220408-MF4.

Key Features

• CVD Duratomic coating: TiCN, Al2O3, and Cr layers for extended tool life on stainless steel
• 6 cutting edges per insert on a 60-degree triangular body
• MF4 chip breaker geometry supports back turning, boring, facing, and turning
• Negative rake angle with chamfered and honed cutting edge for edge stability
• Neutral hand orientation fits standard TNMG right-hand and left-hand toolholders
• Meets ANSI and ISO dimensional standards; ISO code TNMG220408-MF4

Compatibility

Designed for use in TNMG-style toolholders that accept clamp, pin, or lever-lock insert retention. Compatible with turning, boring, and facing applications on stainless steel and steel workpieces. Fits toolholders within the length range of 0.7 inches to 10.0 inches. Verify toolholder pocket geometry and insert seat against the TNMG432 insert size code before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine before changing inserts. Seat the insert firmly against the toolholder pocket and tighten the clamp, pin, or lever-lock mechanism to the toolholder manufacturer's specified torque. Inspect the cutting edge and coating for damage before initiating the first cut; a chipped or delaminated edge should not be run.