Sandvik Coromant 5731613 Indexable Boring Bar Left Hand

Product Description

The SANDVIK COROMANT 5731613 is a solid carbide indexable boring bar from the CoroTurn 107 series, designed for internal boring and turning operations on small-diameter bores. The toolholder style is E-STFC with a left-hand cut orientation and a neutral rake angle of 0 degrees. It accepts a single TCMT 1.21.20 insert secured by screw clamping, providing reliable insert retention during interrupted or continuous cuts. The 1/4-inch shank diameter and 4-inch overall length make this bar well suited for tight-access bore applications where rigidity and dimensional control are critical. Coolant-through capability supports chip evacuation and thermal management at the cutting zone.

This boring bar is used in CNC lathes and turning centers performing internal diameter operations on small bores with a minimum bore diameter of 0.3425 inches (8.70 mm). Its multi-use design supports both boring and turning applications. The CoroTurn 107 series is commonly applied in precision component manufacturing, aerospace, medical, and general metalworking environments where consistent bore finish and dimensional accuracy are required. A licensed machinist or CNC operator typically handles setup and operation.

Key Features

• Minimum bore diameter of 0.3425 inches (8.70 mm) for tight-bore access
• Solid carbide construction for superior rigidity and vibration resistance in small-diameter bars
• Screw clamping insert retention with TCMT 1.21.20 insert compatibility
• Coolant-through design for improved chip evacuation and tool life
• Neutral rake angle supports stable cutting across a range of materials
• Multi-use application: boring and turning from a single toolholder

Compatibility

Designed for use with TCMT 1.21.20 inserts. Part of the SANDVIK COROMANT CoroTurn 107 series. Compatible with 1/4-inch shank tool blocks and boring bar holders on CNC lathes and turning centers configured for that shank size.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before mounting or removing the toolholder. Ensure the shank bore and clamping surfaces are clean and free of chips before seating the bar. Do not exceed the insert manufacturer's recommended cutting parameters for the TCMT 1.21.20 insert grade selected.