Sandvik Coromant 5908981 Turning Insert CNMG433-SMR H13A

Product Description

The SANDVIK COROMANT 5908981 is a solid carbide, uncoated turning insert in the CNMG433-SMR H13A designation, part of the T-Max P series. It features an 80-degree diamond shape (Insert Shape Code C) with a neutral hand orientation and a 3/64-inch (0.0472 inch) corner radius. The inscribed circle measures 1/2 inch (12.70 mm), and insert length is 12.90 mm (0.5079 inch). With four cutting edges and a clearance code of N, this insert is designed for precision turning operations. It is installed by machinists and CNC operators in metalworking and precision machining environments.

This insert is engineered primarily for stainless steel applications (ISO material code M) and is also suited for superalloy and titanium workpieces (ISO material code S). Typical use cases include external and internal turning on CNC lathes and turning centers where consistent chip control and edge stability are required. The SMR chip breaker geometry supports controlled chip formation at moderate to high feeds. The ISO code for this insert is CNMG120412SMRH13A. It is held in place using a clamp and pin system, standard for CNMG-style toolholders.

Key Features

• Solid carbide construction with bright/uncoated finish for heat-sensitive workpiece materials
• SMR chip breaker geometry optimized for stainless steel and superalloy turning
• 80-degree diamond insert shape with 4 usable cutting edges for extended tool life
• Corner radius of 3/64 inch (1.20 mm) for controlled surface finish
• Maximum depth of cut: 8.50 mm (0.3346 inch)
• Clamp and pin holding method compatible with standard CNMG toolholders

Compatibility

Designed for use in CNMG-style toolholders that accept a 1/2-inch inscribed circle insert with clamp and pin clamping. Compatible with turning applications on stainless steel, superalloy, and titanium workpieces. Refer to the T-Max P series toolholder documentation for confirmed holder compatibility.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. The machine spindle must be fully stopped and the turret or toolpost de-energized before seating or replacing any insert. Inspect the insert pocket and clamping components for wear or debris before installation. Torque the clamp screw to the toolholder manufacturer specification — do not over-torque carbide inserts as this risks fracture.