Sandvik Coromant 5721918 Indexable Boring Bar Left Hand

Product Description

The SANDVIK COROMANT 5721918 is an indexable boring bar designed for internal turning and boring operations on CNC lathes and turning centers. Built to the CoroTurn 107 series standard, this left-hand toolholder features a 5/8-inch shank diameter and an 8-inch overall length, with a minimum bore diameter of 0.7717 inches (19.60 mm). The bar uses screw clamping to secure CCMT 32.52 inserts and is machined from steel with a neutral rake angle of 0 degrees. It is installed by machinists and CNC turning specialists working in production and job-shop environments.

This boring bar is suited for both boring and turning applications where left-hand cutting direction is required. The CoroTurn 107 toolholder style supports CCMT 32.52 inserts with a 3/8-inch inscribed circle. Coolant-through capability makes it compatible with high-pressure coolant systems, supporting tool life and chip evacuation in deep-bore applications. The center-to-cutting-edge dimension is 0.4060 inches (10.31 mm), and the neck diameter matches the shank at 5/8 inch, providing consistent clearance in the bore.

Key Features

• Left-hand cut orientation for CNC turning and boring operations
• Screw clamping insert retention for rigid, repeatable positioning of CCMT 32.52 inserts
• Coolant-through design supports high-pressure coolant delivery to the cutting zone
• Neutral rake (0 degrees) and 0-degree lead angle for balanced cutting forces
• Multi-use toolholder rated for both boring and turning applications
• CoroTurn 107 series with A-SCLC toolholder style for standardized insert and spare-parts sourcing

Compatibility

Accepts CCMT 32.52 inserts with a 3/8-inch (9.53 mm) inscribed circle and 5/32-inch insert thickness. Part of the SANDVIK COROMANT CoroTurn 107 series. Compatible with CNC lathes and turning centers equipped with 5/8-inch boring bar holders and high-pressure coolant systems.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. The machine spindle must be fully stopped and all energy isolated before mounting or changing toolholders. Verify insert seating and screw torque against the insert manufacturer guidelines before running. Confirm bore clearance against the 0.7717-inch minimum bore diameter before use to avoid toolholder contact with the workpiece.