Sumitomo 18RBW0R Grooving Insert GCMN3125GG AC830P Carbide

Product Description

The SUMITOMO 18RBW0R is a solid carbide grooving insert in the GND series, designed for precision external grooving and parting operations on CNC lathes and turning centers. This double-ended, neutral-hand insert carries a 0.125 inch (3.18 mm) cutting width and a maximum depth of cut of 0.750 inch (19.05 mm). The AC830P grade features a CVD coating process that delivers wear resistance and thermal stability when cutting stainless steel and carbon steel. A positive rake angle of 5 degrees and the GG chip breaker geometry support controlled chip evacuation and reduced cutting forces across a range of feed and speed conditions.

The 18RBW0R is suited for grooving and parting operations on stainless steel and steel workpieces in both production and job-shop turning environments. The GCMN3125GG insert style is a standard format compatible with GND-series toolholders used on most CNC turning platforms. The 0.20 mm corner radius (0.0079 inch) makes it appropriate for applications requiring a near-sharp corner profile. This insert is typically specified by machinists and CNC operators running ferrous materials where edge retention and chip control are priorities.

Key Features

• Solid carbide substrate with AC830P grade CVD coating for extended tool life on stainless steel and steel
• 0.125 inch (3.18 mm) cutting width suits standard narrow-groove and parting applications
• Maximum depth of cut 0.750 inch (19.05 mm); effective depth-of-cut range 0.300 to 1.000 inch
• Double-ended insert geometry provides two usable cutting edges per insert
• GG chip breaker promotes positive chip control and reduced built-up edge
• Positive rake angle (5 degrees) lowers cutting forces on tough ferrous materials
• Conforms to ANSI and ISO 13399 standards; ANSI code GCMN3125R0.5-GG

Compatibility

Designed for use in GND-series grooving toolholders accepting GCMN3125-style inserts. Primary workpiece materials are stainless steel (ISO material code M) and steel (ISO material code P).

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's torque specifications for the clamping screw. Ensure the insert pocket and locating surfaces are clean and free of chips before seating the insert. Power down and lock out the machine spindle before changing inserts. Do not exceed the recommended depth-of-cut range for this insert style, as doing so may cause insert fracture or toolholder damage.