Sandvik Coromant 5751729 Turning Insert TCGX21.51 Carbide

Product Description

The SANDVIK COROMANT 5751729 is a solid carbide turning insert in the CoroTurn 107 series, designed for precision finishing operations on CNC lathes and turning centers. This left-hand insert carries an ANSI code of TCGX21.51 and an ISO code of TCGX 11 02 04L-WK 1125. It features a 60-degree triangular shape with a positive side clearance and a 7-degree relief angle, making it well suited for light, accurate cuts. The TiAlN and AlCr2O3 PVD coating delivers high wear resistance while maintaining toughness across demanding materials. Machinists and CNC operators working in job shops or production environments will find this insert appropriate for finishing passes where tight tolerances and consistent surface finish are required.

This insert is intended for finishing applications on steel and stainless steel workpieces, corresponding to ISO material groups M and S, including special and super alloys. The WK chip breaker geometry is optimized for finishing cuts, promoting controlled chip flow at typical finishing feed rates and depths of cut. It is appropriate for both light production turning and close-tolerance work where surface integrity matters. The CoroTurn 107 series is engineered for screw-held insert clamping systems with a through-hole mounting method.

Key Features

• TiAlN and AlCr2O3 PVD coating provides high wear resistance suited to stainless steel and super alloy machining
• WK chip breaker geometry optimized for finishing operations with controlled chip evacuation
• 60-degree triangular insert shape with 3 usable cutting edges maximizes insert utilization
• Positive side clearance and 7-degree relief angle reduce cutting forces on thin-walled or deflection-sensitive workpieces
• Left-hand orientation for specific toolholder and insert pocket configurations
• Screw-held clamping method ensures secure, repeatable seating in compatible CoroTurn 107 toolholders

Compatibility

Designed for use in CoroTurn 107 series screw-clamp toolholders that accept TCGX-style inserts with a 1/4-inch inscribed circle and ANSI size code 21.51. Compatible toolholders must be configured for left-hand, screw-held insert mounting.

Installation Notes

Insert installation and replacement should be performed by a qualified machinist or CNC operator with the machine fully stopped and all motion axes at rest. Use the correct torque wrench and insert screw recommended by the toolholder manufacturer to avoid cracking the carbide or stripping the clamping screw. Inspect the insert pocket seat for debris or damage before seating a new insert, as contamination can cause premature edge failure or dimensional error. Always verify insert orientation — left-hand designation affects cutting direction and must match the toolholder pocket design.