Iscar 5550521 Turning Insert Wnmg Trigon IC8250

Product Description

The ISCAR 5550521 is a solid carbide turning insert in the WNMG style, designed for external and internal turning operations on CNC lathes and turning centers. It carries ISCAR grade IC8250 with a multilayer PVD-applied coating of TiCN, Al2O3, and TiN, delivering wear resistance and thermal stability across a range of cutting conditions. The insert features an 80-degree trigon geometry, a 3/8-inch inscribed circle, a 1/32-inch corner radius, and a positive rake angle with PP chip breaker. Insert length is 6.52 mm (0.2567 inches) and thickness is 5/32 inch (0.1560 inches). It is part of the ISCAR Isoturn series and is installed by machinists and CNC lathe operators in production and job-shop environments.

This insert is suited for turning steel and stainless steel workpieces, with primary workpiece material codes of P and M per ISO classification. The PP chip breaker geometry is optimized for finishing and semi-finishing passes at moderate feed rates and depths of cut up to 3.00 mm (0.1180 inches). The positive rake design reduces cutting forces, making it appropriate for long overhangs, slender workpieces, or lighter-duty machine setups where minimizing deflection is a priority. Typical applications include external diameter turning, shoulder turning, and light profiling on production runs.

Key Features

• IC8250 solid carbide grade with multilayer TiCN, Al2O3, TiN PVD coating for wear and thermal resistance
• 80-degree trigon (W) insert shape with positive rake for reduced cutting forces
• PP chip breaker geometry optimized for finishing and semi-finishing cuts
• Maximum depth of cut 3.00 mm (0.1180 inches)
• Compatible with both clamp and pin insert holding methods
• Conforms to ISO 13399 tooling data standards

Compatibility

Designed as an OEM-style replacement and standard fitment insert for WNMG-style turning toolholders that accept a 3/8-inch inscribed circle insert with a 0.1500-inch hole diameter, using clamp or pin holding methods per the Isoturn series specification.

Installation Notes

This insert is installed and indexed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before seating or indexing inserts. Use the correct torque driver for the clamping screw to ensure proper seating without cracking the insert. Inspect the toolholder pocket and seating surface for chips or debris before installation, as contamination will affect insert stability and edge life.