Sandvik Coromant 5756128 Indexable Drill Insert WCMX51

Product Description

The SANDVIK COROMANT 5756128 is a solid carbide indexable drill insert in the WCMX style, grade 235, designed for use in indexable insert drills in metal-cutting applications. The insert features a trigon (W) shape with a 7-degree relief angle and a chipbreaker designation of 51, which promotes controlled chip evacuation during drilling. It is CVD-coated with TiCN and TiN layers to improve wear resistance and extend tool life in steel and cast-iron drilling operations. With a 5/16-inch inscribed circle and 1/8-inch thickness, this is a compact peripheral or center insert suited for precision hole-making in machining environments.

This insert is intended for use in CNC machining centers, turning centers with live tooling, and dedicated drill press setups where indexable drill bodies accept WCMX-style inserts. It is appropriate for right-hand cutting operations in production shops, tool rooms, and job shops working with steel, alloy steel, and similar materials. The 0.80 mm corner radius provides a balance between edge strength and surface finish at the hole entry and exit. Machinists and CNC operators performing high-volume drilling cycles will find this insert suited to applications requiring consistent tool life and repeatable hole geometry.

Key Features

• WCMX insert style with trigon shape and 7-degree relief angle for positive cutting action
• Grade 235 solid carbide substrate with CVD-applied TiCN and TiN coating for extended wear resistance
• 5/16-inch (0.3125 inch) inscribed circle fits standard WCMX indexable drill bodies
• 0.80 mm corner radius balances edge strength with hole-entry geometry
• Chipbreaker 51 promotes controlled chip formation in drilling operations
• Right-hand cutting direction; sold individually with a minimum order quantity of 10

Compatibility

Designed as an OEM-style replacement insert for indexable drill bodies that accept WCMX-style inserts with a 5/16-inch inscribed circle and a 3.20 mm mounting hole diameter.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. Ensure the drill body and insert pocket are clean and free of chips or debris before seating the insert. Power down and lock out the machine spindle before changing inserts. Use the correct torx or hex key to achieve proper clamping torque as specified by the drill body manufacturer — do not overtighten or undertighten the insert screw.