Sumitomo 19HW178 WNMG432EEX Turning Insert AC520U

Product Description

The SUMITOMO 19HW178 is a solid carbide, PVD-coated turning insert in the WNMG style, designed for external turning operations on CNC and manual lathes. Manufactured to ANSI and ISO 13399 standards, it carries grade AC520U with a proprietary ZX coating and an EEX chip breaker geometry. The insert features a positive rake angle of 16 degrees, a neutral hand orientation, and a trigon (80-degree included angle) shape. It is intended for use by machinists and toolroom professionals machining stainless steel and superalloy workpieces where controlled chip evacuation and edge durability are critical.

This insert is suited for finish and semi-finish turning passes on difficult-to-machine materials including stainless steel and superalloys. The EEX chip breaker promotes efficient chip control at moderate to light depths of cut. It fits standard WNMG-style toolholders with a clamp and pin holding method. Typical applications include shaft turning, facing, and contour passes in aerospace, medical, and industrial manufacturing environments. The insert belongs to Sumitomo series TN and conforms to ISO code WNMG080408N-EX.

Key Features

• AC520U grade with PVD-applied ZX proprietary coating for wear resistance on stainless steel and superalloys
• EEX chip breaker geometry engineered for controlled chip evacuation during finish and semi-finish cuts
• Positive rake angle of 16 degrees reduces cutting forces on difficult materials
• Neutral hand orientation for versatile toolholder compatibility
• Conforms to ANSI and ISO 13399 standards for consistent dimensional interchangeability
• Clamp and pin holding method provides secure seating under interrupted or continuous cuts

Compatibility

Designed for use in standard WNMG-style turning toolholders that accept a 1/2-inch inscribed circle insert with clamp and pin retention. Recommended for machining stainless steel (material code M) and superalloy (material code S) workpieces. Material grade classification C2 and C3.

Installation Notes

Installation should be performed by a qualified machinist with the machine powered off and all axes locked before indexing or replacing inserts. Use the appropriate torx or hex key to tighten the clamp screw to the toolholder manufacturer's specified torque. Inspect the toolholder pocket and locating pin for debris or damage before seating the insert. Confirm the insert is fully seated and locked before resuming any cutting operation.