Sandvik Coromant 5728661 Boring Bar Modular Adapter

Product Description

The SANDVIK COROMANT 5728661 is a modular boring bar adapter designed for precision internal turning and boring operations in CNC machining environments. It accepts a 0.9843 inch (25 mm) bore diameter and provides a 77 mm (3.0315 inch) bore depth, giving machinists the clearance needed for deep-bore applications. The adapter features a C4 modular connection size and a 1.5748 inch (40 mm) body diameter. An integrated internal coolant channel routes cutting fluid directly to the cutting zone, improving chip evacuation and tool life during deep-bore passes. This component is installed by CNC machinists and toolroom technicians working with modular tooling systems.

This adapter is suited for internal boring operations on CNC lathes and turning centers that accept C4-series modular tooling. It is appropriate for both production and job-shop environments where modular quick-change tooling is used to reduce setup time. The screw thread lock mechanism secures the boring bar head, and the lock screw compatibility is specified for part 5761135. The internal coolant feature makes it well suited for materials that generate significant heat or produce difficult-to-clear chips during deep boring passes.

Key Features

• 0.9843 inch (25 mm) bore diameter for precise internal boring fitment
• 77 mm (3.0315 inch) bore depth supports deep-bore machining applications
• C4 modular connection size for compatibility with C4-series quick-change tooling systems
• 1.5748 inch (40 mm) body diameter for rigidity and vibration damping
• Internal coolant channel delivers cutting fluid directly to the cutting zone
• Screw thread lock design with compatible lock screw part 5761135

Compatibility

Designed for use with C4-series modular boring bar systems. Compatible lock screw is part number 5761135. Manufacturer part number reference: C4-391.27-25 077.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician familiar with modular turning tooling. Power down and lock out the spindle before mounting or removing the adapter. Ensure the C4 interface and bore surfaces are clean and free of chips or burrs before assembly. Follow the tooling manufacturer torque and clamping guidelines for the lock screw to prevent movement under cutting loads.