Sandvik Coromant 5757801 Threading Insert Grade 1125

Product Description

The SANDVIK COROMANT 5757801 is a solid carbide threading insert designed for internal thread cutting operations. Part of the CoroThread 266 series, this insert features a left-hand orientation and cuts partial profile 55-degree threads at a 60-degree included angle. It is rated at a manufacturer grade of 1125 with a PVD coating process, delivering wear resistance suited to demanding threading cycles. With an ISO code of 266LL16VW01A002M1125 and a chipbreaker designation of A, this insert provides repeatable thread form geometry in production and job shop environments. Licensed machinists and CNC turning specialists are the primary installers.

This insert is used for internal threading applications covering a pitch range of 8 to 14 TPI. It fits standard CoroThread 266 toolholders designed for size 16 inserts. Typical applications include threading bores in ferrous and non-ferrous workpieces on CNC lathes and turning centers. The left-hand configuration is specified for left-hand thread forms or reverse-spindle setups. It suits both production environments with high cycle counts and maintenance shops performing precision thread repairs.

Key Features

• Solid carbide substrate with PVD coating for extended tool life
• Left-hand insert orientation for left-hand internal threading
• Partial profile 55-degree thread standard with 60-degree included angle
• Internal pitch range of 8 to 14 TPI
• Chipbreaker type A for controlled chip evacuation in bores
• CoroThread 266 series for use with compatible 266-series toolholders

Compatibility

Designed for use with CoroThread 266 series toolholders accepting size 16 threading inserts with left-hand, internal thread configuration.

Installation Notes

Threading inserts should be installed by a qualified machinist following the toolholder manufacturer's clamping torque specifications. Power down and lock out the machine spindle before changing inserts. Inspect the toolholder pocket and clamping screw for damage or debris before seating the insert. Do not exceed the recommended cutting parameters for the grade and coating specified by the manufacturer.