Iscar 3303939 Turning Insert VNGU220630R3N IC20 Solid Carbide

Product Description

The ISCAR 3303939 is a solid carbide turning insert in the VNGU style, designed for precision external and internal turning operations on CNC and conventional lathes. Designated grade IC20 and left uncoated, this insert features a 35-degree diamond shape with a 3 mm corner radius and a 12.7 mm inscribed circle. The RN3 chip breaker geometry supports positive rake cutting, reducing cutting forces and heat generation. It is installed by machinists and toolroom operators in production and job-shop environments where tight tolerances and consistent chip control are required.

This insert belongs to the Isoturn series and is rated for universal primary workpiece material compatibility, covering material codes H, K, M, N, and S. Typical applications include finish and semi-finish turning of a broad range of metals. The 4.5 mm maximum depth of cut makes it well suited to light roughing and finishing passes. The VNGU clearance and tolerance codes indicate a neutral clearance angle with a precision ground tolerance class, supporting accurate, repeatable fits in toolholders designed for this insert geometry.

Key Features

• IC20 uncoated solid carbide grade for broad material compatibility
• 35-degree diamond insert shape (V code) with positive rake for reduced cutting forces
• 3 mm corner radius for surface finish consistency on semi-finish and finish passes
• RN3 chip breaker geometry for reliable chip control across universal workpiece materials
• Maximum depth of cut of 4.5 mm supports light roughing through finish turning
• Conforms to ISO 13399 standard for consistent toolholder interface data

Compatibility

Designed for use in VNGU-style toolholders accepting a 35-degree diamond insert with a 0.5000-inch inscribed circle and 1/4-inch insert thickness, as specified under ISO 13399. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before seating or removing the insert. Ensure the toolholder pocket and clamping surfaces are clean and free of chips before inserting. Refer to the toolholder manufacturer specifications for correct clamping torque and insert orientation to avoid chipping or premature edge failure.