Sandvik Coromant 7860817 Turning Insert DCMT21.52-PM

Product Description

The SANDVIK COROMANT 7860817 is a solid carbide turning insert in the CoroTurn 107 series, designed for external and internal turning operations on CNC lathes and turning centers. It carries the ISO designation DCMT 07 02 08-PM 4425 and features a 55-degree diamond shape (Insert Shape Code D) with a 7-degree relief angle. The insert is CVD-coated with a TiCN, Al2O3, and TiN multilayer stack under grade 4425, optimizing wear resistance and thermal stability. The PM chip breaker geometry is engineered for steel and cast iron machining at productive cutting parameters. Two cutting edges per insert are available, and the neutral hand orientation suits a wide range of toolholder setups.

This insert is suited for finishing to medium roughing passes on steel (ISO P) as the primary workpiece material, with cast iron (ISO K) as a secondary application. The PM chip breaker geometry controls chip flow across a broad feed and depth-of-cut range, making this insert a practical choice for general-purpose turning in both job-shop and production environments. It fits CoroTurn 107 toolholders that accept DCMT-style inserts with a clamp and screw holding method.

Key Features

• 55-degree diamond insert shape with 7-degree relief angle for positive cutting action
• CVD multilayer coating: TiCN, Al2O3, TiN under manufacturer grade 4425 for extended tool life on steel and cast iron
• PM chip breaker geometry optimized for ISO P steel and ISO K cast iron applications
• 0.79 mm (0.0313 inch) corner radius balances edge strength and surface finish
• Two usable cutting edges per insert for cost efficiency
• Neutral hand orientation compatible with a broad range of DCMT toolholders

Compatibility

Designed for use in CoroTurn 107 series toolholders that accept DCMT-style inserts with clamp and screw holding. ISO code DCMT 07 02 08-PM 4425. Manufacturers catalog number DCMT 2(1.5)2-PM 4425.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist or toolroom technician following the toolholder manufacturer's torque and clamping specifications. Power down and lock out the machine spindle before changing inserts. Inspect the insert pocket and seating surface for chips or debris before installing a new insert, as contamination will affect runout and edge life. Follow applicable shop safety procedures and machine tool manufacturer guidelines when handling carbide inserts.