Sandvik Coromant 7861115 Turning Insert VBMT21.50-UF 4425

Product Description

The SANDVIK COROMANT 7861115 is a VBMT-style turning insert designed for external turning operations on CNC lathes and turning centers. It features a 35-degree diamond shape (V), a neutral hand orientation, and a 0.20 mm (0.0079 inch) corner radius suited for finishing and semi-finishing passes. The insert is manufactured from solid carbide with a CVD-applied multilayer coating of Al2O3, TiCN, and TiN, giving it strong wear resistance and thermal stability. It carries manufacturer grade 4425 and belongs to the CoroTurn 107 series. The inscribed circle measures 1/4 inch (0.2500 inch) and the insert thickness is 3/32 inch (0.0938 inch). Licensed machinists and CNC operators use this insert in production turning of steel and cast iron components.

This insert is intended for turning steel (ISO material group P) as the primary workpiece material and cast iron (ISO material group K) as a secondary application. The UF chip breaker geometry is optimized for light to medium cutting depths with controlled chip formation, making it well suited for finishing operations where surface finish and dimensional accuracy are priorities. It is compatible with clamp and screw holding methods on tool holders designed to accept VBMT 11 02 02 geometry inserts. The CoroTurn 107 series is a widely used platform for external and internal profiling on both manual and automated turning equipment.

Key Features

• 35-degree diamond insert shape (V) with neutral hand for versatile external turning
• CVD multilayer coating: Al2O3, TiCN, and TiN for thermal resistance and edge wear protection
• Manufacturer grade 4425 rated for steel (P) and cast iron (K) workpiece materials
• UF chip breaker geometry designed for finishing and semi-finishing operations
• 0.20 mm corner radius for improved surface finish on finished bores and diameters
• Compatible with clamp and screw holding methods; no wiper edge

Compatibility

Designed as an OEM-specification insert for tool holders accepting VBMT 11 02 02 geometry within the Sandvik Coromant CoroTurn 107 series. ISO code: VBMT 11 02 02-UF 4425. Industry standard number: VBMT 11 02 02-UF 4425. Manufacturers catalog number: VBMT 2(1.5)0-UF.

Installation Notes

Installation is performed by a qualified CNC machinist or turning center operator. Power down the machine and follow lockout/tagout procedures before seating or replacing inserts. Ensure the pocket and clamping surfaces are clean and free of chips before installing the insert. Use the appropriate torque driver for the clamp or screw holding method per the tool holder manufacturer specifications; do not overtighten, as carbide inserts are brittle and can fracture under excessive clamping force.