Sandvik Coromant 7860968 Boring Insert SPMT0808BR 4425

Product Description

The SANDVIK COROMANT 7860968 is a solid carbide boring insert designed for precision metal-cutting operations in turning and boring applications. It carries the SPMT0808-BR 4425 designation and features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN for wear resistance and thermal stability when cutting steel. The insert measures 8.90 mm inscribed circle (0.3504 inches), 3.00 mm thick (0.1181 inches), and has a 0.80 mm corner radius (0.0315 inches). With a positive rake geometry and an 11-degree relief angle, this insert is suited for general-purpose steel machining at moderate to high cutting speeds.

This insert is intended for use in the CoroBore 111 series boring system. It fits clamp and screw-style insert holders and is rated with a primary workpiece material code of P, meaning it is optimized for machining steel grades including unalloyed, low-alloy, and high-alloy carbon steels. The BR chipbreaker geometry is designed for controlled chip formation across a range of depths of cut and feed rates, making it a reliable choice for production boring on CNC lathes and machining centers. Four neutral cutting-direction edges are available per insert.

Key Features

• Solid carbide substrate with CVD multilayer TiCN/Al2O3/TiN coating for extended tool life in steel cutting
• Square SPMT insert shape with 4 usable cutting edges per insert
• Positive rake geometry with 11-degree relief angle for reduced cutting forces
• BR chipbreaker for controlled chip evacuation at moderate feeds
• Compatible with clamp and screw insert-holding methods
• Neutral cutting direction suits a wide range of boring configurations

Compatibility

Designed for use with the CoroBore 111 boring system. Insert style is SPMT; compatible holders must accept an SPMT0808 insert seated via clamp or screw clamping. ANSI and ISO code: SPMT0808-BR 4425.

Installation Notes

Installation is performed by a machinist or tooling technician on a CNC lathe or machining center with the spindle fully stopped and the machine in a locked-out, tagged-out state. Use the correct torque driver or wrench specified by the toolholder manufacturer when securing the clamping screw — do not overtighten by hand. Inspect the insert seat and clamping pocket for chips or debris before seating the insert. Index or replace the insert when measurable flank wear or surface-finish degradation is observed; do not continue running a failed edge.