Sandvik Coromant 7859155 Turning Insert CNMM544-QR 4415

Product Description

The SANDVIK COROMANT 7859155 is a CNMM-style indexable turning insert in the T-Max P series, designed for external and internal turning operations on CNC lathes and turning centers. It features an 80-degree diamond (rhombic) insert shape with a neutral hand orientation and a 1/16-inch corner radius (0.0625 inches). The substrate is solid carbide with a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, corresponding to manufacturer grade 4415. This combination delivers wear resistance and thermal stability suited for medium to rough turning passes. Licensed machinists and CNC operators install this insert in compatible tool holders as a direct indexable replacement.

This insert is rated for primary use on steel workpieces (ISO material group P) and secondary use on cast iron (ISO material group K), making it well suited for production turning in general machining, job shops, and heavy manufacturing environments. The QR chip breaker geometry is intended for medium to roughing cuts where chip control and edge strength are priorities. Each insert provides 2 cutting edges, and the insert is held by clamp or screw depending on the toolholder setup.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for thermal and abrasion resistance
• 80-degree diamond insert shape (Shape Code C) for versatile turning access
• QR chip breaker geometry optimized for medium to rough turning applications
• Neutral hand orientation compatible with neutral-hand toolholders
• 2 usable cutting edges per insert to extend tooling value
• Clamp or screw holding method for secure seating in CNMM-compatible holders

Compatibility

Designed for use in CNMM-style toolholders accepting a 1/4-inch inscribed circle insert with a 0-degree relief angle (Clearance Code N) and tolerance code M. ISO code CNMM 16 06 16-QR 4415. Compatible holders must support clamp or screw retention. Verify toolholder specifications before installation.

Installation Notes

This insert is installed by qualified machinists or CNC tooling technicians. Power down and lock out the machine before changing inserts. Seat the insert fully and evenly in the pocket before tightening the clamp or screw to the toolholder manufacturer's specified torque. Inspect the insert pocket and seating surface for chips or debris that could cause improper seating or edge breakage during cutting.