Sandvik Coromant 5721745 Indexable Boring Bar 3/8in Shank

Product Description

The SANDVIK COROMANT 5721745 is an indexable boring bar from the CoroTurn 107 series, designed for internal turning, boring, and profiling operations on CNC lathes and turning centers. Built from steel with a 3/8-inch (9.53 mm) shank diameter, this right-hand holder accepts a single DCMT 21.51 insert secured by screw clamping. The overall length is 6 inches (152.40 mm), and the minimum bore diameter is 0.5984 inches (15.20 mm). Coolant-through capability supports chip evacuation in deep-bore applications. Neutral rake geometry and a 0-degree lead angle make this bar suitable for a wide range of workpiece materials.

This boring bar is used in precision internal machining applications including boring, profiling, and turning in residential shop, job shop, and production manufacturing environments. The CoroTurn 107 series is engineered for close-tolerance internal work where stable clamping and insert repeatability are critical. A center-to-cutting-edge dimension of 0.375 inches (9.53 mm) and a neck diameter of 0.375 inches allow access to tight bore geometries. Machinists and CNC operators in metalworking and toolroom settings are the primary installers of this toolholder.

Key Features

• CoroTurn 107 series indexable boring bar with screw clamping for secure insert retention
• Minimum bore diameter of 0.5984 inches (15.20 mm) for close-tolerance internal work
• Coolant-through design supports chip control in deep or difficult bores
• Right-hand cut orientation with neutral rake and 0-degree lead angle
• Multi-use tool rated for boring, profiling, and turning operations with a single holder
• Steel construction with 3/8-inch shank diameter for rigid setup in compatible tooling blocks

Compatibility

Designed for use with DCMT 21.51 inserts (1/4-inch inscribed circle). Suitable for CNC lathes and turning centers with toolholding systems that accept a 3/8-inch round shank. Compatible with standard CoroTurn 107 series inserts as specified by SANDVIK COROMANT.

Installation Notes

Installation is performed by CNC machinists or toolroom technicians. The machine spindle must be fully stopped and the control placed in an e-stop or lockout state before changing toolholders or inserts. Verify shank diameter compatibility with the turret or boring bar holder before mounting. Torque the screw-clamped insert according to the insert manufacturer's specified tooling documentation for the DCMT 21.51 seat.