Sandvik Coromant 5730726 Turning Insert DCMT21.51KM H13A

Product Description

The SANDVIK COROMANT 5730726 is a solid carbide uncoated turning insert in a 55-degree diamond shape, designed for external turning operations on CNC and manual lathes. Assigned ISO code DCMT070204KMH13A, this insert carries the H13A grade designation and features the KM chip breaker geometry optimized for controlled chip formation. With a 0.25-inch inscribed circle, a 0.0157-inch corner radius, and a maximum depth of cut of 0.2894 inches, it suits finishing and light semi-finish turning passes. The neutral hand orientation fits standard DCMT-style toolholders. Licensed machinists and CNC operators install this insert in precision turning cells across production and job-shop environments.

This insert is part of the CoroTurn 107 series and is engineered primarily for cast iron workpieces, with secondary suitability for non-ferrous metals. It is appropriate for both light production and maintenance turning work where an uncoated carbide grade is preferred for edge sharpness and minimal built-up edge on non-ferrous alloys. The DCMT style and screw-clamping holding method make it compatible with a wide range of indexed toolholders accepting DCMT inserts in the 21.51 size class. Two cutting edges are available per insert, providing an economical cutting edge count for short to medium run jobs.

Key Features

• H13A uncoated solid carbide grade for sharp edge retention on cast iron and non-ferrous metals
• KM chip breaker geometry for controlled chip formation at finishing depths of cut
• 55-degree diamond insert shape (DCMT) with neutral hand for versatile toolholder compatibility
• 0.0157-inch corner radius for fine finishing surface finish results
• Maximum depth of cut of 0.2894 inches suitable for light to semi-finish turning passes
• Screw-clamping insert holding method for secure, repeatable seating in DCMT toolholders
• Two usable cutting edges per insert for extended insert economy

Compatibility

Designed for use in DCMT-style screw-clamp toolholders accepting the 21.51 insert size class within the CoroTurn 107 series. Primary workpiece material is cast iron; secondary application is non-ferrous metal. ISO code DCMT070204KMH13A may be used to cross-reference compatible toolholder specifications.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC operator with the machine powered down and the spindle locked. Use the appropriate torx or hex key to seat the clamping screw to the toolholder manufacturer's specified procedure without overtorquing the insert pocket. Inspect the insert pocket and clamping screw for wear or debris before seating a new insert. Always verify insert orientation and hand designation against the toolholder specification before resuming cutting operations.