Sumitomo 18HWW17 Grooving Insert AC520U Gnd Series

Product Description

The SUMITOMO 18HWW17 is a solid carbide grooving insert designed for precision external and internal grooving operations on CNC lathes and turning centers. It carries a manufacturer grade of AC520U with a PVD coating process, delivering wear resistance across a broad range of workpiece materials. The insert features a neutral hand orientation and a full-radius corner profile with a 3.18 mm corner radius, supporting consistent chip formation. With a 0.25 inch cutting width and a maximum depth of cut of 1.0 inch, it handles medium to deep grooving passes in production and job-shop turning environments. Licensed machinists and CNC operators install this insert as a direct replacement in compatible GND series toolholders.

The 18HWW17 is suited for universal workpiece material applications, including steel, stainless steel, cast iron, and non-ferrous alloys, as indicated by material codes K, M, P, and S. It fits turning operations in both high-volume production and general-purpose machining environments where consistent groove geometry and dimensional repeatability are required. The RG chip breaker geometry promotes positive rake cutting action at a 5-degree rake angle, helping to control chip evacuation during deep grooving passes. This insert is part of the GND series and conforms to ANSI and ISO 13399 standards.

Key Features

• AC520U grade with PVD coating for extended tool life across multiple workpiece materials
• Full radius corner geometry with 3.18 mm corner radius for consistent groove profiles
• 0.25 inch cutting width with a maximum depth of cut of 1.0 inch
• RG chip breaker with 5-degree positive rake angle for controlled chip evacuation
• Neutral hand orientation compatible with standard GND series toolholders
• Conforms to ANSI and ISO 13399 standards for tooling interoperability

Compatibility

Designed for use in SUMITOMO GND series grooving toolholders. Insert style code is GCMN6250-RG per ANSI designation. Compatible with universal workpiece material categories K, M, P, and S. Verify toolholder seat dimensions against insert size code 6250 before installation.

Installation Notes

Insert installation and replacement should be performed by a qualified machinist or CNC tooling technician with the machine spindle fully stopped and the machine locked out per facility safety procedures. Use the appropriate torx or hex key torque tool specified by the toolholder manufacturer to secure the clamp screw — do not overtighten by hand estimation. Inspect the insert seat and clamp for debris or wear before seating the new insert. Confirm secure clamping and run a test pass before returning to production feed rates.