Sandvik Coromant 7859239 Turning Insert SNMG432-PM 4415

Product Description

The SANDVIK COROMANT 7859239 is a SNMG-style indexable turning insert in the T-Max P series, designed for external turning operations on CNC lathes and turning centers. This insert carries manufacturer grade 4415 and features a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, making it well suited for steel and cast iron machining at productive cutting parameters. The square insert shape provides 8 available cutting edges, and the neutral hand orientation fits a wide range of toolholders. A 0.79 mm corner radius balances surface finish quality with edge strength across roughing and semi-finishing passes. Machinists and CNC operators in production and job-shop environments are the primary users of this insert.

This insert is intended for turning applications on primary workpiece materials classified as steel (ISO P) and secondary materials classified as cast iron (ISO K). The PM chip breaker geometry is optimized for continuous and interrupted cuts in these materials, helping control chip formation across a range of feeds and depths of cut. It is sized with a 1/2 inch (12.70 mm) inscribed circle and fits standard SNMG 12 04 toolholder pockets. Typical install scenarios include finish and semi-finish turning on production lathes where consistent tool life and chip control are required. Compatible with clamp and screw holding methods as specified by the toolholder design.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear and crater resistance on steel and cast iron
• 8 cutting edges per insert, maximizing cost-per-edge efficiency
• PM chip breaker geometry for reliable chip control in steel (ISO P) and cast iron (ISO K)
• Neutral hand orientation for broad toolholder compatibility
• 0.79 mm (0.0313 inch) corner radius for a balance of edge strength and surface finish
• Clamp and screw holding method compatibility for secure seating under heavy cuts

Compatibility

Designed for use in SNMG 12 04 toolholder pockets accepting clamp or screw holding methods. ISO code SNMG 12 04 08-PM 4415. Primary workpiece material compatibility: steel (ISO P). Secondary workpiece material compatibility: cast iron (ISO K).

Installation Notes

Insert indexing and replacement should be performed with the machine spindle stopped and all axes at a safe position per shop lockout/tagout procedures. Use the appropriate torque wrench and clamping hardware specified by the toolholder manufacturer when securing the insert with screw or clamp methods. Inspect the toolholder pocket and seating surfaces for debris or damage before indexing to a fresh cutting edge. Consult the toolholder manufacturer guidelines for proper clamp torque values, as over- or under-torquing can affect insert seating and cutting performance.