Sandvik Coromant 5857562 Threading Insert 8 Tpi Stub Acme

Product Description

The SANDVIK COROMANT 5857562 is a solid carbide laydown threading insert designed for external Stub Acme thread cutting at 8 threads per inch (TPI). Part of the CoroThread 266 series, this insert carries a TiCrAlN/TiN coating applied via PVD process, which provides wear resistance and extended tool life in demanding threading operations. It features a right-hand cutting orientation and a 60-degree included angle. With an inscribed circle of 0.375 inches and a thickness of 0.1563 inches, the insert is sized for standard 266-series toolholders. Manufacturer grade 1135 is suited for threading applications where a balance of toughness and edge retention is required. Installation is performed by qualified machinists on CNC or manual lathes.

This insert is used in external threading operations producing Stub Acme thread profiles, commonly found in power transmission components, lead screws, and linear actuator systems. It is engineered for right-hand thread cutting on external workpiece diameters. The CoroThread 266 series is a common platform used in production and job-shop environments on CNC turning centers handling a range of ferrous and non-ferrous materials. Machinists working with linear motion hardware and power screw assemblies will find this insert applicable to their standard Stub Acme threading requirements.

Key Features

• Solid carbide substrate for rigidity and dimensional stability during threading passes
• TiCrAlN/TiN PVD coating for heat and wear resistance at the cutting edge
• 8 TPI Stub Acme external thread profile with 60-degree included angle
• Right-hand cutting orientation, grade 1135, with F chipbreaker geometry
• Inscribed circle of 0.375 inches and hole diameter of 0.1732 inches for toolholder seating
• Single tooth per side design for precise single-point threading control

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting insert size code 16 laydown threading inserts. Catalog number 266RG-16SA01F080E 1135 identifies the exact insert geometry and grade for toolholder matching.

Installation Notes

This insert is installed and replaced by qualified machinists or tooling technicians following standard indexable insert procedures. Power down and lock out the machine spindle before seating or removing the insert. Use a torx or hex key of the appropriate size for the toolholder clamp screw and do not exceed the toolholder manufacturer's specified clamp torque. Inspect the toolholder pocket and clamp for damage or debris before seating the new insert.