Sandvik Coromant 5857607 Threading Insert 8 Tpi Stub Acme

Product Description

The SANDVIK COROMANT 5857607 is a solid carbide laydown threading insert engineered for precision internal Stub Acme thread cutting. Part of the CoroThread 266 series, it carries a PVD-applied TiCrAlN/TiN coating that resists heat and wear during continuous threading operations. The insert is configured for right-hand cutting at 8 threads per inch with a 60-degree included angle. With a 3/8-inch (9.53 mm) inscribed circle and a thickness of 5/32 inches (3.97 mm), it fits standard 266-series holders designed for that IC size. Manufacturer grade 1135 and chipbreaker designation F make this insert suited to medium-duty threading on common ferrous and non-ferrous materials.

This insert is intended for internal Stub Acme threading applications on CNC lathes and turning centers in production machining environments. Stub Acme threads are commonly found in power-transmission components, lead screws, and mechanical actuators requiring a shallower thread depth than full Acme profiles. The right-hand geometry and single tooth per side design allow controlled chip formation on internal bores. Machinists, toolroom technicians, and CNC operators working in job shop or production settings will find this insert appropriate for both light and medium stock removal in threading passes where dimensional accuracy and surface finish are critical.

Key Features

• Solid carbide substrate provides rigidity and dimensional stability during threading passes
• PVD TiCrAlN/TiN coating extends tool life through thermal and abrasion resistance
• Right-hand internal Stub Acme geometry at 8 TPI with 60-degree included angle
• 3/8-inch inscribed circle (9.53 mm) with 0.1732-inch hole diameter for secure clamping
• Chipbreaker style F promotes controlled chip evacuation in internal bore operations
• CoroThread 266 series compatibility ensures drop-in fit with matching 266-series toolholders

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting a 16-size (3/8-inch IC) laydown threading insert. The manufacturer catalog number for this insert is 266RL-16SA01F080E 1135. Verify holder size code and insert style code 266 before installation.

Installation Notes

Threading inserts of this type are installed and replaced by qualified machinists or CNC toolroom technicians. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench and clamping screw specified by the toolholder manufacturer to secure the insert without cracking the carbide substrate. Inspect the insert pocket and clamping screw threads for wear or debris before seating a new insert.