Sandvik Coromant 7860484 Turning Insert TCMT21.51-UM 4415

Product Description

The SANDVIK COROMANT 7860484 is a TCMT-style triangular turning insert from the CoroTurn 107 series, designed for external turning and boring operations on CNC lathes and turning centers. The insert is manufactured from solid carbide and features a CVD-applied multilayer coating of Al2O3, TiCN, and TiN, which provides thermal resistance and wear protection during continuous and light interrupted cuts. With a 0.25-inch inscribed circle, a corner radius of 0.40 mm (0.0156 inches), and a neutral hand orientation, this insert suits precision finishing and semi-finishing passes. Licensed machinists and CNC operators working in production or job-shop environments are the typical end users.

This insert is rated for primary use on steel (ISO material code P) and secondary use on cast iron (ISO material code K), making it a general-purpose option for shops that run both material types on the same machine. The CoroTurn 107 series is engineered for positive-rake toolholders that accept TCMT geometry inserts with clamp or screw holding methods. The UM chip breaker geometry supports controlled chip formation at moderate cutting parameters, keeping the work area clear during turning cycles.

Key Features

• CVD-coated with Al2O3, TiCN, and TiN for extended tool life on steel and cast iron
• Triangle insert shape with 60-degree included angle and 3 usable cutting edges
• 0.40 mm corner radius for semi-finishing and finishing surface quality
• Neutral hand orientation fits both right-hand and left-hand toolholder setups
• UM chip breaker geometry for controlled chip evacuation at moderate feed rates
• ISO code TCMT 11 02 04-UM 4415 for cross-referencing to standard toolholder catalogs

Compatibility

Designed for use in CoroTurn 107 series toolholders that accept TCMT geometry inserts with clamp or screw holding. Compatible with toolholder setups specifying TCMT 11 02 04 insert geometry. Verify toolholder pocket geometry and ISO insert code before ordering.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC operator with the machine powered down and the spindle locked. Use the correct torque wrench and insert screw specified by the toolholder manufacturer when securing with a screw-held pocket. Inspect the insert seat for chips or debris before seating the new insert, as contamination in the pocket will affect runout and surface finish. Follow the toolholder manufacturer's clamping instructions and the machine tool builder's safe tooling change procedures.