Sandvik Coromant 7861050 Turning Insert Vbmt 220-PF 4425

Product Description

The SANDVIK COROMANT 7861050 is a VBMT-style indexable turning insert from the CoroTurn 107 series, designed for external turning operations on CNC lathes and turning centers. It carries grade 4425, a CVD-coated carbide substrate with an Al2O3, TiN, and TiCN multilayer coating stack optimized for wear resistance and thermal stability. The insert features a 35-degree diamond shape (V), a 1/4-inch (0.2500 inch) inscribed circle, a 0.20 mm corner radius, and a PF chip breaker geometry. With a neutral hand orientation and two usable cutting edges, it is suited for finish to light-roughing passes in steel and cast iron. CNC machinists and tool-crib technicians are the primary users.

This insert is built for turning steel (ISO material code P) as its primary workpiece material, with cast iron (ISO material code K) as a secondary application. The PF chip breaker is designed to produce controlled chip flow at moderate depths of cut and feed rates typical of finishing and semi-finishing operations. The CoroTurn 107 series uses a clamp-and-screw holding method, making this insert compatible with toolholders that accept VBMT geometry with a 2.80 mm hole diameter. The ISO designation for this insert is VBMT 11 03 02-PF 4425.

Key Features

• Grade 4425 CVD-coated carbide with Al2O3, TiN, and TiCN multilayer coating for extended tool life on steel and cast iron
• 35-degree diamond insert shape (V) provides a sharp, low-force cutting geometry suited for finishing passes
• PF chip breaker geometry promotes controlled chip formation at finish to semi-finish parameters
• Neutral hand orientation allows use in both left- and right-hand toolholder configurations where geometry permits
• Two usable cutting edges per insert for cost-effective indexing
• Clamp and screw holding method ensures secure seating in compatible CoroTurn 107 toolholders

Compatibility

Designed for use in CoroTurn 107 series toolholders accepting VBMT insert geometry with a clamp-and-screw holding method. ISO code VBMT 11 03 02-PF 4425. Intended for turning steel and cast iron workpieces. Verify toolholder pocket dimensions and clamping style before installation.

Installation Notes

Indexable turning inserts are installed by qualified CNC machinists or toolroom technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torx or hex key to tighten the clamping screw to the toolholder manufacturer's specified torque — do not over-tighten or use impact tools. Inspect the insert seat and shim for debris or damage before seating a new edge to ensure proper insert contact and runout.