Sandvik Coromant 5907004 Threading Insert 16 Tpi 3/8 in Ic

Product Description

The SANDVIK COROMANT 5907004 is a laydown threading insert designed for right-hand internal UN thread cutting at 16 threads per inch. Part of the CoroThread 266 series, it is manufactured from solid carbide and finished with a PVD-applied TiCrAlN/TiN coating for extended tool life in demanding threading operations. The insert carries a 3/8 inch inscribed circle, measures 5/32 inch thick, and features a 60-degree included angle with a single tooth per side. It is used by machinists and toolmakers working on CNC lathes and turning centers where consistent internal thread form and finish are required.

This insert is suited for internal UN thread applications in production machining environments, including job shops and manufacturing facilities running high-volume or precision threading operations. The CoroThread 266 insert style and F chipbreaker geometry make it appropriate for threading in steel and similar workpiece materials where chip control and surface finish consistency are priorities. The manufacturer catalog number for this insert is 266RL-16UN01C160M 1135.

Key Features

• Solid carbide construction with PVD TiCrAlN/TiN coating for wear resistance
• Right-hand internal UN thread form at 16 TPI with 60-degree included angle
• 3/8 inch (9.53 mm) inscribed circle for use in compatible CoroThread 266 toolholders
• F chipbreaker geometry for effective chip control during internal threading
• Single tooth per side design for precise thread profile control
• Grade 1135 with PVD coating process for consistent performance

Compatibility

Designed for use in CoroThread 266 series toolholding systems that accept a 16 insert size code with a 3/8 inch inscribed circle and 0.1732 inch hole diameter. Confirm toolholder compatibility with the 266RL insert style before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with indexable insert tooling. Power down and lock out the machine before seating or replacing the insert. Use the appropriate torx or clamping key specified for the CoroThread 266 toolholder — do not overtighten the clamping screw, as carbide inserts are brittle and can crack under improper clamping force. Verify insert seating and clearance before resuming cutting operations.