Sandvik Coromant 5908975 Turning Insert CNMG432-SMR H13A

Product Description

The SANDVIK COROMANT 5908975 is a solid carbide, uncoated turning insert in the CNMG432-SMR H13A designation, part of the T-Max P series. It features an 80-degree diamond insert shape with a neutral hand orientation and is manufactured to CNMG ISO tolerances. The inscribed circle measures 0.5000 inches (12.70 mm), the insert length is 0.3346 inches (8.50 mm), and the corner radius is 0.0313 inches (0.79 mm). With four cutting edges and an SMR chip breaker geometry, this insert is suited for demanding turning applications on difficult-to-machine materials. Licensed machinists and CNC operators select this insert where tool life and edge integrity under tough cutting conditions are the priority.

This insert is designed primarily for turning stainless steel (ISO material code M) and is also rated for superalloys and titanium (ISO material code S). It fits into indexable turning toolholders that accept CNMG-style inserts with clamp and pin holding methods. Typical applications include external and internal turning operations on CNC lathes in job shop, aerospace, and energy sector environments where stainless and superalloy workpieces are common. The H13A uncoated carbide grade is selected when coating interaction with the workpiece must be avoided or when cutting temperatures require a substrate with strong edge toughness.

Key Features

• Solid carbide H13A uncoated grade — suited for stainless steel, superalloys, and titanium
• 80-degree diamond insert shape (CNMG) with neutral hand orientation
• SMR chip breaker geometry for controlled chip evacuation in tough materials
• Four indexable cutting edges per insert
• Corner radius of 0.0313 inches (0.79 mm) for balanced edge strength and surface finish
• Inscribed circle of 0.5000 inches (12.70 mm); insert thickness of 0.1875 inches (4.76 mm)
• ISO designation CNMG120408-SMR H13A — cross-referenceable to standard CNMG catalogues

Compatibility

Designed for use in indexable turning toolholders that accept CNMG-style inserts secured by clamp and pin holding methods, with a hole diameter of 0.2030 inches (5.16 mm). Consult the toolholder manufacturer specifications to confirm seat and clamp compatibility before installation.

Installation Notes

Indexable insert replacement is performed by qualified machinists or CNC operators with the machine powered down and spindle locked per shop safety procedures. Use the appropriate torque wrench or insert key specified by the toolholder manufacturer when seating the clamp or pin — do not over-tighten by feel alone. Inspect the insert pocket and seating surface for chips or debris before indexing to a fresh cutting edge. Dispose of worn carbide inserts in accordance with local regulations for industrial tooling waste.