Sandvik Coromant 5757968 Threading Insert 28 Tpi Unj

Product Description

The SANDVIK COROMANT 5757968 is a laydown threading insert designed for external UNJ thread cutting applications. Built from solid carbide with a PVD-applied TiCrAlN/TiAlN dual-layer coating, this insert delivers hard, wear-resistant cutting edges suited to demanding threading operations on CNC lathes and turning centers. It carries a 28 threads-per-inch (TPI) pitch with a 60-degree included angle and a right-hand cutting orientation. The insert fits toolholders in the CoroThread 266 series and is indexed for single-tooth-per-side engagement. Machinists and CNC operators working in aerospace, defense, and precision mechanical applications will find this insert appropriate for controlled-pitch UNJ thread forms.

This insert is intended for external threading on turned components where UNJ thread standards are required. UNJ threads feature a controlled root radius that improves fatigue resistance, making them common in aerospace structural and fastener applications. The 3/8-inch (9.53 mm) inscribed circle and 5/32-inch (3.97 mm) thickness place this insert in the 266 Series 16 size family. It is suited to production environments running steel, stainless steel, and similar machinable alloys where PVD-coated carbide grades perform reliably.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiAlN coating for wear resistance and edge stability
• 28 TPI external UNJ thread form with 60-degree included angle
• Right-hand cutting orientation for standard lathe setup
• 3/8 inch (9.53 mm) inscribed circle, 5/32 inch (3.97 mm) thickness
• Chipbreaker style A for controlled chip evacuation during threading passes
• CoroThread 266 Series compatibility with 0.1732-inch hole diameter for secure clamping

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders sized for 16-size laydown threading inserts. The manufacturers catalog number for this insert is 266RG-16NJ01A280E 1125.

Installation Notes

Threading inserts should be installed by qualified CNC machinists or toolroom technicians following the toolholder manufacturer's clamping torque specifications. Power down and lock out the machine spindle before seating or indexing any insert. Ensure the insert pocket and locating surfaces are clean and free of chips before clamping. Verify thread form and pitch with a calibrated thread gauge after the first pass before committing to a full production run.