Sandvik Coromant 5721749 Indexable Boring Bar 0.48in Left Hand

Product Description

The SANDVIK COROMANT 5721749 is an indexable boring bar from the CoroTurn 107 series, designed for internal boring and turning operations on CNC lathes and turning centers. The toolholder features a 3/8-inch shank diameter and accepts CCMT 21.51 inserts secured by screw clamping. With a minimum bore diameter of 0.4803 inches (12.20 mm) and a 6-inch overall length, this left-hand-cut bar suits close-tolerance internal features. The neutral rake geometry and 0-degree lead angle provide stable, predictable cutting performance across a range of workpiece materials. Steel construction keeps the bar rigid under load.

This boring bar is suited for precision internal turning work in job shops, production machining environments, and tool rooms. The CoroTurn 107 series is engineered for light to moderate internal operations where insert access and secure clamping are priorities. The bar supports both boring and turning applications from a single toolholder, making it a practical choice for multi-operation setups. Coolant-through capability allows directed coolant delivery to the cutting zone, helping manage chip evacuation and tool life in deeper bore applications.

Key Features

• Left-hand cut orientation with neutral rake and 0-degree lead angle for stable internal cutting
• Screw clamping insert retention for repeatable indexing with CCMT 21.51 inserts
• Coolant-through design directs fluid to the cutting edge for improved chip control
• Multi-use toolholder supports both boring and turning operations
• 3/8-inch shank diameter with 6-inch overall length suits compact and standard lathe turrets
• Steel body construction provides rigidity and dampens vibration at depth

Compatibility

Compatible with CCMT 21.51 series inserts with a 1/4-inch inscribed circle. Part of the SANDVIK COROMANT CoroTurn 107 toolholder series. Designed for use in CNC lathe and turning center applications requiring left-hand internal boring or turning with a 3/8-inch shank toolholder.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. Secure the shank in the turret or boring bar holder to the full recommended clamping depth before operation. Power down and lock out the machine before changing inserts or adjusting the toolholder. Verify minimum bore clearance against the 0.4803-inch minimum bore diameter before use to avoid contact with the bore wall.