Seco 00039080 Milling Insert SONX120508TR-M12 T350M Carbide

Product Description

The SECO 00039080 is a solid carbide milling insert carrying ANSI/ISO designation SONX120508TR-M12 and manufacturer grade T350M. Designed for indexable face and shoulder milling operations, this square-shaped single-sided insert features a CVD-applied TiCN and Al2O3 coating for elevated wear resistance and thermal stability. It delivers four usable cutting edges per insert with a positive rake angle of 16 degrees and a T-Land cutting edge style. At 0.5 inches inscribed circle diameter and 0.2035 inches thick, it fits the SECO R220.99-12 cutter series and is held in place by a screw-type clamping method. Machinists and tooling specialists working on CNC milling equipment install this insert.

This insert is primarily rated for stainless steel (ISO material code M) and is also suitable for steel (P), cast iron (K), and superalloys and titanium (S). The M12 chip breaker geometry supports medium-grain cutting conditions across these material groups. Typical applications include face milling, shoulder milling, and general metal removal operations on CNC machining centers where consistent chip control and edge life across varied workpiece materials are required. The right-hand insert orientation and 90-degree included angle make it suitable for perpendicular shoulder milling profiles.

Key Features

• Solid carbide construction with CVD-applied TiCN and Al2O3 dual-layer coating for thermal and abrasion resistance
• Four cutting edges per insert — square shape with 90-degree included angle
• Positive rake angle (16 degrees) with T-Land edge prep reduces cutting forces on difficult materials
• M12 chip breaker optimized for medium-grain conditions across steel, stainless, cast iron, and superalloys
• Maximum depth of cut: 0.4331 inches; effective cutting edge length: 0.5 inches
• Compatible with SECO R220.99-12 cutter series; screw-hold mounting for secure seating

Compatibility

Designed for use with the SECO R220.99-12 cutter series. ANSI and ISO code SONX120508TR-M12 with insert size code 120508 confirms fitment within the SONX-12 series toolholders accepting this insert geometry and screw-hold method.

Installation Notes

Installation is performed by qualified machinists or tooling technicians on powered-down CNC milling equipment with all spindle motion fully stopped and machine locked out per facility LOTO procedures. Use the appropriate Torx or hex key driver to seat the clamping screw to the toolholder manufacturer's specified torque — consult the cutter body documentation for that value. Inspect the insert pocket for chips or debris before seating the insert to ensure full contact and accurate indexing. Do not force or strike the insert during installation.