Sandvik Coromant 5857577 Threading Insert 14 Tpi

Product Description

The SANDVIK COROMANT 5857577 is a solid carbide laydown threading insert designed for external UN thread cutting operations. Part of the CoroThread 266 series, this insert carries a TiCrAlN/TiN PVD coating that improves wear resistance and tool life on threading passes. It produces a right-hand external thread at 14 threads per inch with a 60-degree included angle and a single tooth per side cutting profile. The 3/8-inch inscribed circle and 5/32-inch thickness place it in the 266-series 16 insert size. Licensed machinists and CNC lathe operators install this insert in compatible CoroThread 266 toolholders for production and job-shop threading work.

This insert is suited for external UN thread generation on CNC lathes and turning centers in both production and repair environments. The F chipbreaker geometry supports controlled chip flow during threading passes. Manufacturer grade 1135 with TiCrAlN/TiN PVD coating targets steel and similar materials where coating durability under threading loads is a priority. It is appropriate for shop environments requiring precise, repeatable UN thread forms on external diameters.

Key Features

• Solid carbide substrate with TiCrAlN/TiN PVD coating for extended wear resistance
• 14 TPI right-hand external UN thread form with 60-degree included angle
• CoroThread 266 series, insert size code 16, manufacturer grade 1135
• F chipbreaker geometry for controlled chip evacuation during threading passes
• 3/8-inch inscribed circle, 5/32-inch thickness, single tooth per side
• Hole diameter of 0.1732 inches for secure toolholder seating

Compatibility

Designed for use in CoroThread 266 series toolholders accepting a size 16 insert with a 266RG insert style. Verify toolholder compatibility using the manufacturer catalog number 266RG-16UN01F140E 1135 when cross-referencing holder specifications.

Installation Notes

Installation is performed by qualified machinists or CNC lathe operators. Power down and lock out the machine spindle before seating or removing the insert. Use the correct torx or insert clamping tool specified for CoroThread 266 toolholders and do not overtighten the clamping screw. Inspect the insert pocket and clamping components for wear or debris before seating a new insert.