Sandvik Coromant 5721312 Indexable Boring Bar 0.5984 in

Product Description

The SANDVIK COROMANT 5721312 is an indexable boring bar from the CoroTurn 107 series, designed for internal boring and turning operations on CNC lathes and machining centers. Built from steel with a 1/2-inch shank diameter and a 6-inch overall length, this right-hand holder accepts CCMT 21.51 inserts secured by screw clamping. The minimum bore diameter is 0.5984 inches (15.20 mm), making it suitable for small-to-medium bore work. The neutral rake geometry and 0-degree lead angle support stable, predictable cutting in a range of materials. This toolholder is handled and set up by machinists and CNC operators in production and job-shop environments.

This boring bar is suited for both boring and turning applications in light to moderate cutting conditions. The CoroTurn 107 series is a widely used Sandvik Coromant platform for positive-insert internal machining. A single insert is used per holder. The coolant-through design allows cutting fluid delivery close to the insert, supporting chip evacuation and tool life in deep-bore and high-speed applications. It is appropriate for use in both production shops and precision machining environments where consistent bore quality is required.

Key Features

• CoroTurn 107 series platform for positive-insert internal turning and boring
• Minimum bore diameter of 0.5984 inches (15.20 mm) for small-bore applications
• Screw clamping insert retention for secure, repeatable indexing
• Coolant-through capability for improved chip evacuation and insert life
• Neutral rake geometry with 0-degree rake and lead angles for stable cutting
• Multi-use design rated for both boring and turning operations

Compatibility

Designed to accept CCMT 21.51 inserts with a 1/4-inch inscribed circle. Compatible with tooling setups requiring a 1/2-inch shank in standard boring bar holders and turrets on CNC lathes and turning centers.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. The machine spindle must be fully stopped and the turret locked before changing or indexing the insert. Ensure the shank is clamped squarely in the boring bar holder to the correct overhang for the target bore depth. Follow the machine tool manufacturer and insert manufacturer guidelines for speeds, feeds, and torque when tightening the insert screw.