Sumitomo 19RBW4V Turning Insert DCMT21.51ENK AC830P Carbide

Product Description

The SUMITOMO 19RBW4V is a solid carbide turning insert in the DCMT style, designed for single-point external turning operations on CNC and manual lathes. Manufactured to ANSI code DCMT21.51ENK and ISO code DCMT070204N-SK, this insert features a 55-degree diamond shape with a positive rake geometry and a 7-degree relief angle. The AC830P grade substrate is CVD coated for wear resistance across a broad range of metalcutting applications. The ENK chip breaker geometry supports controlled chip evacuation during moderate to heavy turning passes. Licensed machinists and toolroom operators install this insert into compatible screw-lock toolholders.

This insert is suited for turning stainless steel, carbon steel, alloy steel, and universal workpiece materials, corresponding to ISO material groups M and P. It is applicable in both roughing and finishing passes where a 1/64-inch corner radius and a 1/4-inch inscribed circle diameter are appropriate for the feature geometry. Typical installations involve screw-clamped DCMT-style toolholders in production turning cells, job shop lathes, and turret setups where consistent insert indexing and secure clamping are required.

Key Features

• ANSI code DCMT21.51ENK and ISO code DCMT070204N-SK for precise toolholder matching
• AC830P grade with CVD coating for extended tool life on steel and stainless applications
• 55-degree diamond insert shape with positive rake for reduced cutting forces
• ENK chip breaker geometry promotes reliable chip control at moderate feed rates
• Screw-lock holding method provides secure, repeatable insert indexing
• Neutral hand orientation compatible with standard DCMT toolholder configurations

Compatibility

Designed as an OEM-style replacement or direct specification insert for screw-clamped DCMT-style turning toolholders conforming to ANSI and ISO 13399 standards. Compatible with workpiece material grades C5, C5A, and C6 per material grade classification.

Installation Notes

Installation is performed by machining professionals following standard insert indexing procedures. Power down and lock out the machine spindle before changing inserts. Seat the insert fully against the toolholder pocket locating surfaces before tightening the clamping screw to the toolholder manufacturer's specified torque. Inspect the insert pocket for chips or debris prior to installation to ensure proper seating and accurate tool-nose radius position.