Sandvik Coromant 5730840 Turning Insert DCMT21.51-MM 1105

Product Description

The SANDVIK COROMANT 5730840 is a solid carbide turning insert in the DCMT21.51-MM 1105 geometry, part of the CoroTurn 107 series. It features a 55-degree diamond insert shape (Shape Code D) with a TiAlN coating applied via PVD process, delivering wear resistance and thermal stability during turning operations. The inscribed circle measures 0.25 inches (1/4 inch), insert length is 0.2894 inches, and corner radius is 0.0156 inches (1/64 inch). With 2 cutting edges and an MM chip breaker, this insert is suited for finishing and semi-finishing passes where consistent chip control and edge integrity are required. Licensed HVAC and machining professionals handling precision metal removal operations install and index these inserts as part of routine tooling maintenance.

This insert is designed primarily for steel workpieces and is rated for secondary use on stainless steel, superalloys, and titanium. The CoroTurn 107 series targets external turning and profiling applications in both light and medium-duty material removal. It is held in place via screw clamping (Insert Holding Method: Screw) and follows a neutral hand orientation, making it compatible with standard DCMT-style toolholders. The ISO designation for this insert is DCMT 07 02 04-MM 1105. Typical applications include CNC lathe turning operations where tight tolerances and controlled chip evacuation are priorities.

Key Features

• TiAlN coating via PVD process for high heat and wear resistance during turning
• 55-degree diamond insert shape with 2 cutting edges for versatile profiling
• MM chip breaker geometry optimized for controlled chip evacuation
• Screw-held mounting with Clearance Code C and Tolerance Code M for consistent seating
• Primary workpiece material rating for steel; secondary ratings for stainless steel, superalloy, and titanium
• PVD TiAlN coating preserves sharp edge geometry compared to CVD alternatives

Compatibility

This insert carries ISO designation DCMT 07 02 04-MM 1105 and is part of the SANDVIK COROMANT CoroTurn 107 series. It is compatible with DCMT-style screw-clamp toolholders designed for 55-degree diamond inserts with a 1/4-inch inscribed circle. Confirm toolholder pocket geometry and screw size before indexing.

Installation Notes

Indexing and replacement of turning inserts is performed by machinists and CNC tooling technicians. Power down and lock out the machine spindle before accessing the toolholder. Use the appropriate Torx or hex key to loosen the clamping screw, seat the new insert flush against the pocket locating surfaces, and torque the screw per the toolholder manufacturer's specification. Inspect the insert pocket for chips or debris before seating to avoid micro-fracture of the cutting edge.