Sandvik Coromant 5907005 Laydown Threading Insert 14 Tpi Un

Product Description

The SANDVIK COROMANT 5907005 is a solid carbide laydown threading insert from the CoroThread 266 series, designed for right-hand internal UN thread cutting at 14 threads per inch (TPI). It carries a PVD-applied TiCrAlN/TiN dual-layer coating that provides wear resistance and thermal stability during high-speed threading operations. The insert features a 60-degree included angle and a single tooth per side, making it well suited for precision internal thread forming on CNC lathes and turning centers. Machinists and toolroom professionals install this insert as a replaceable cutting element in compatible CoroThread 266 toolholders.

This insert is used in precision machining environments where consistent UN internal thread profiles are required. Typical applications include threading bores in workpieces made of steel, stainless, and similar materials in production turning operations. The C chipbreaker geometry helps manage chip flow in internal threading passes. The insert size code is 16, with a 3/8 inch (9.53 mm) inscribed circle and a 5/32 inch (0.1563 inch decimal) thickness, fitting toolholder pockets designed for the 266 insert style.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiN coating for extended tool life
• Right-hand internal UN thread profile at 14 TPI with 60-degree included angle
• C chipbreaker geometry for controlled chip evacuation in internal threading
• 3/8 inch inscribed circle with 5/32 inch insert thickness (0.1563 inch decimal)
• Single tooth per side for precise thread form accuracy
• CoroThread 266 series insert style 266, size code 16

Compatibility

Designed for use in CoroThread 266 series toolholders accepting insert style 266, size code 16, with a hole diameter of 0.1732 inch (4.40 mm). Manufacturer catalog number for this insert is 266RL-16UN01C140M 1135.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians on CNC or manual lathes. Power down and lock out the machine spindle before seating or replacing the insert. Use the correct torx or hex key specified for the CoroThread 266 toolholder clamp screw and ensure the insert seats fully and evenly in the pocket before resuming cuts. Do not overtighten the clamp screw, as solid carbide inserts are brittle and can crack under excessive clamping force.