Sandvik Coromant 5746858 Milling Insert Grade 3040 R390

Product Description

The SANDVIK COROMANT 5746858 is a solid carbide milling insert in the R390 series, designed for high-performance shoulder milling operations. Coated with TiCN and Al2O3 via CVD process, this grade 3040 insert delivers wear resistance and thermal stability across demanding cutting conditions. The insert carries a parallelogram shape with a positive rake angle of 17 degrees and a corner radius of 0.0315 inches (0.80 mm). It features two cutting edges and is held in place by a screw-type clamping system. This insert is a right-hand, single-sided design with a KM chip breaker geometry optimized for controlled chip evacuation in steel, cast iron, and hard material applications.

The 5746858 is intended for use in R390 cutter bodies in both roughing and semi-finishing passes on steel, cast iron, and hard materials corresponding to ISO material grades P, K, and H. Typical applications include shoulder milling, pocket milling, and ramping cuts in CNC machining environments. The maximum depth of cut reaches 16.00 mm (0.6299 inches), making it suitable for moderate-to-aggressive material removal rates in production machining. The insert size code is 170408 and the ANSI/ISO catalog designation is R390-17 04 08M-KM 3040. This product is commonly used by CNC machinists and tooling specialists in job shop and production environments.

Key Features

• Grade 3040 solid carbide substrate with CVD-applied TiCN and Al2O3 coating for extended tool life
• Positive rake angle of 17 degrees reduces cutting forces and heat buildup
• KM chip breaker geometry controls chip formation across steel and cast iron workpieces
• Two cutting edges per insert for cost-effective indexing
• Corner radius of 0.0315 inches (0.80 mm) minimizes edge chipping at entry and exit
• Compatible with R390 cutter bodies for consistent, repeatable fitment in existing tooling setups

Compatibility

Designed for use with Sandvik Coromant R390 series cutter bodies. ANSI and ISO code: R390-17 04 08M-KM 3040. Suitable for machining steel, cast iron, and hard materials (material grades P20, K30, H25).

Installation Notes

Installation is performed by qualified CNC machinists or tooling technicians. Power down and lock out the spindle before indexing or replacing inserts. Use the appropriate torx or hex key to tighten the insert screw to the cutter body specification provided in the tool body documentation — do not overtighten or undertighten the clamping screw. Inspect the insert pocket and clamping screw for wear or debris before seating a new insert to ensure proper contact and runout.