Sandvik Coromant 7859104 Turning Insert DCMT21.51-PF 4415

Product Description

The SANDVIK COROMANT 7859104 is a solid carbide turning insert in the DCMT style, designed for precision external turning operations on CNC and manual lathes. This insert carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides wear resistance and thermal stability across a range of cutting conditions. It features a 55-degree diamond shape (Insert Shape Code D), a 0.40 mm corner radius, and a neutral hand orientation. The PF chip breaker geometry is engineered for finishing and light roughing passes. Qualified to ISO Code DCMT 07 02 04-PF 4415, this insert is a direct fit for CoroTurn 107 toolholders and compatible insert pockets of the same geometry class.

This insert is suited for turning steel as its primary workpiece material, with cast iron as a secondary application. It is used in production and job-shop environments where consistent surface finish and dimensional accuracy are required on external diameters, faces, and contours. The PF chip breaker geometry performs well in finishing operations at moderate to light depths of cut, making it appropriate for both high-volume CNC turning cells and lower-volume manual lathe work. Licensed machinists and CNC operators in metalworking, maintenance machining, and general manufacturing are the typical users.

Key Features

• CVD multilayer coating (TiCN, Al2O3, TiN) for thermal wear resistance and extended tool life
• 55-degree diamond insert shape with 7-degree relief angle (Clearance Code C) for positive cutting action
• 0.40 mm corner radius balances surface finish quality with edge strength in finishing passes
• PF chip breaker geometry optimized for steel finishing and light interrupted cuts
• Neutral hand orientation — fits left-hand, right-hand, and straight toolholder configurations
• Two cutting edges per insert for cost-effective indexing

Compatibility

Designed for use in SANDVIK COROMANT CoroTurn 107 toolholders and any compatible insert pocket accepting a DCMT 07 02 04 geometry insert with Clamp or Screw holding method. ISO Code: DCMT 07 02 04-PF 4415. Manufacturers Catalog Number: DCMT 2(1.5)1-PF 4415.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torque wrench and seating screw specified by the toolholder manufacturer to avoid insert rocking or improper seating. Inspect the insert pocket and clamping components for wear or debris before seating a new insert.