Sandvik Coromant 5721310 Indexable Boring Bar 0.681in Rh

Product Description

The SANDVIK COROMANT 5721310 is an indexable boring bar from the CoroTurn 111 series, designed for internal turning operations on CNC lathes and boring machines. It features a 1/2-inch steel shank with screw clamping and accepts DPMT 21.51 inserts with a 1/4-inch inscribed circle. The right-hand cut configuration and 6-degree lead angle with positive rake geometry promote clean chip control and stable cutting action. Minimum bore diameter is 0.681 inches (17.30 mm), and overall length is 6 inches (152.40 mm). Coolant-through capability supports heat management during deep or tight-clearance boring passes. One insert is used per toolholder.

This boring bar suits precision internal machining applications including boring, profiling, and turning in both production and job-shop environments. It is a single-insert toolholder intended for use in CNC lathes, turning centers, and manual engine lathes where a 1/2-inch shank and right-hand tool orientation are required. Its steel construction and CoroTurn 111 platform make it a practical fit for general-purpose ferrous and non-ferrous material removal where tight bore tolerances are needed.

Key Features

• Minimum bore diameter of 0.681 inches (17.30 mm) supports tight-clearance internal operations
• Screw clamping insert retention provides rigid, repeatable insert seating
• Coolant-through design delivers cutting fluid directly to the insert tip
• Positive rake geometry with 6-degree lead angle reduces cutting forces
• Compatible with DPMT 21.51 inserts with 1/4-inch inscribed circle
• Multi-use toolholder supports boring, profiling, and turning in a single setup

Compatibility

Accepts DPMT 21.51 inserts with a 1/4-inch (6.35 mm) inscribed circle. Part of the SANDVIK COROMANT CoroTurn 111 series. Catalogued under manufacturer number A08M-SDUPR 2-E.

Installation Notes

Installation is performed by a machinist or toolroom technician on a CNC or manual turning center. Ensure the machine spindle is fully stopped and the tool turret is in a safe index position before mounting or removing the boring bar. Secure the shank in the toolholder to the depth recommended by the machine tool manufacturer, and verify insert seating and screw torque before initiating a cut. Activate coolant-through supply at the machine before starting the pass when using the internal coolant feature.