Sandvik Coromant 5730939 Turning Insert DCMT32.51-MM 1125

Product Description

The SANDVIK COROMANT 5730939 is a solid carbide turning insert designed for precision external turning operations on CNC lathes and turning centers. Designated DCMT32.51-MM 1125, it features a 55-degree diamond insert shape with a 7-degree relief angle and a 0.0156-inch (1/64 inch) corner radius. The insert carries a dual-layer TiAlN and AlCr2O3 coating applied via PVD process, enhancing wear resistance and thermal stability at the cutting edge. With a neutral hand orientation and MM chip breaker geometry, this insert is suited for finishing and semi-finishing passes where chip control and surface finish consistency are priorities. Licensed machinists and CNC operators install this insert as part of routine tooling maintenance on screw-retained tool holders.

This insert is part of the CoroTurn 107 series and is primarily optimized for machining steel. Secondary workpiece material compatibility extends to stainless steel, superalloys, and titanium, making it a versatile option across job shop and production environments. The DCMT insert style with screw holding method fits standard CoroTurn 107 screw-on tool holders. It is appropriate for both light production runs and high-volume turning applications where consistent dimensional tolerances are required. The ISO code designation is DCMT 11 T3 04-MM 1125. Minimum order quantity is 10 inserts.

Key Features

• TiAlN and AlCr2O3 dual-layer PVD coating for elevated wear resistance and edge stability
• 55-degree diamond insert shape (Shape Code D) with 7-degree relief angle (Clearance Code C)
• MM chip breaker geometry for reliable chip control in steel finishing and semi-finishing
• Neutral hand orientation compatible with standard DCMT screw-on holders
• Two cutting edges per insert for extended tooling economy
• Manufacturer grade 1125 engineered for steel, stainless steel, superalloy, and titanium workpieces

Compatibility

Designed for use with CoroTurn 107 screw-on tool holders accepting DCMT insert style with a 4.40 mm (0.1732-inch) hole diameter. Compatible workpiece materials include steel (primary), stainless steel, superalloys, and titanium per the secondary material codes M, P, and S.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Before indexing or replacing the insert, power down the machine spindle and confirm all motion has stopped. Seat the insert firmly against the pocket locating surfaces and tighten the clamping screw to the tool holder manufacturer specification using the appropriate Torx or hex key. Inspect the cutting edge and seating pocket for chips or debris before securing, as improper seating directly affects dimensional accuracy and insert life.