Sandvik Coromant 5857608 Threading Insert 10 Tpi Stub Acme

Product Description

The SANDVIK COROMANT 5857608 is a solid carbide laydown threading insert designed for cutting internal Stub Acme threads. It carries the manufacturers catalog designation 266RL-16SA01F100E 1135 and belongs to the CoroThread 266 series. The insert features a TiCrAlN/TiN coating applied via PVD process, which supports wear resistance in demanding threading operations. Configured for right-hand cutting at 10 threads per inch (TPI), it has a 3/8-inch inscribed circle, a thickness of 5/32 inches (0.1563 inches decimal), and a 60-degree included angle. It is intended for use by machinists and CNC tooling technicians working on precision threading applications.

This insert is suited for internal threading operations requiring Stub Acme thread form geometry at 10 TPI. The Stub Acme thread standard is common in power transmission components, linear actuators, and jack-screw assemblies where a full-depth Acme thread is not practical. The CoroThread 266 insert style fits compatible 266-series toolholders and boring bars designed for laydown insert geometry. The chipbreaker designation F and single tooth per side configuration support controlled chip formation in internal bores.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN/TiN coating for extended tool life
• Right-hand internal Stub Acme thread form at 10 TPI
• 3/8-inch (9.53 mm) inscribed circle with 5/32-inch (3.97 mm) thickness
• 60-degree included angle with F chipbreaker for chip control in internal bores
• CoroThread 266 series insert style 266, size code 16, manufacturer grade 1135
• Hole diameter of 0.1732 inches (4.40 mm) for secure insert seating

Compatibility

Designed as a replacement-style laydown threading insert for use with CoroThread 266 series toolholders and boring bar bodies that accept the 266 insert style in size code 16.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine before seating or removing the insert. Use the appropriate torx or clamping key specified for the 266-series toolholder to secure the insert without overtightening. Inspect the insert pocket and clamping screw for wear or debris before each insert change to ensure proper seating and thread geometry accuracy.