Sumitomo 196DBWT Turning Insert Vnmg AC6040M Carbide

Product Description

The SUMITOMO 196DBWT is a VNMG-style turning insert manufactured from solid carbide and finished with Sumitomo's Absotech PVD coating in the AC6040M grade. The insert measures 0.6535 inches in length with a 3/8-inch inscribed circle and a 0.0079-inch corner radius. The 35-degree included angle and negative rake geometry make this insert well-suited for precision turning operations where controlled chip formation and edge stability are critical. It is held by clamp and pin and carries a clearance code of N with tolerance code M. The AC6040M grade is classified within the AC6000M series, targeting demanding cutting applications on stainless steel workpieces.

This insert is designed for turning stainless steel workpieces, corresponding to ISO material grades M30 and M40. The ESU chip breaker geometry manages chip evacuation on difficult-to-cut austenitic and duplex stainless alloys, making it a fit for production turning on CNC lathes in precision machining, aerospace component work, and industrial fabrication environments. Machinists and CNC operators installing this insert will find the VNMG form factor compatible with standard VNMG toolholders used across most major lathe platforms. The ISO code for this insert is VNMG160402N-SU.

Key Features

• Absotech PVD coating in AC6040M grade for wear resistance on stainless steel
• ESU chip breaker geometry designed for controlled chip formation on M-group materials
• Negative rake, 35-degree included angle VNMG insert shape for stable cutting edge engagement
• Clamp and pin holding method for secure, repeatable seating in the toolholder
• 0.0079-inch corner radius for fine-to-medium finishing and semi-finishing passes
• PVD coating process preserves sharp edge geometry compared to CVD alternatives

Compatibility

Designed as an OEM-style replacement turning insert for use in standard VNMG-style toolholders. Specific compatible model numbers were not provided in the product data; verify toolholder pocket specifications against the VNMG330.5 insert dimensions before installation.

Installation Notes

Insert replacement should be performed by a qualified machinist or CNC operator with the machine fully stopped and the spindle locked out per facility lockout/tagout procedures. Use the appropriate torque wrench and clamp hardware specified by the toolholder manufacturer when seating the insert. Inspect the toolholder pocket for wear or debris before installing a new insert. Never run the insert beyond its usable cutting edges, as a worn edge on stainless steel can work-harden the workpiece surface and damage the next edge prematurely.