Sandvik Coromant 5758001 Threading Insert 20 Tpi Unj

Product Description

The SANDVIK COROMANT 5758001 is a solid carbide laydown threading insert designed for external UNJ thread cutting at 20 threads per inch (TPI). Part of the CoroThread 266 series, it carries a dual PVD coating of TiAlN and TiCrAlN for wear resistance and thermal stability at the cutting edge. The insert is right-hand oriented, features a 60-degree included angle, and is sized with a 3/8 inch (9.53 mm) inscribed circle and a thickness of 5/32 inch (3.97 mm). Manufacturer grade 1125 indicates a tough carbide substrate suited to threading operations where edge integrity is critical. Installation is performed by machinists and CNC tooling specialists on lathes and turning centers.

This insert is intended for external UNJ thread forms in precision threading applications, including aerospace and high-strength fastener contexts where UNJ thread profiles are specified. The 266RG-16NJ01A200E 1125 catalog designation aligns it to the CoroThread 266 toolholder system. The single-tooth-per-side geometry and A-style chipbreaker support controlled chip evacuation during threading passes on a range of metallic workpiece materials.

Key Features

• Solid carbide substrate, manufacturer grade 1125, for high edge toughness in threading operations
• Dual PVD coating: TiAlN and TiCrAlN for heat and wear resistance
• External UNJ thread standard, right-hand cutting, 20 TPI
• 60-degree included angle with A-style chipbreaker for controlled chip flow
• 3/8 inch inscribed circle, 5/32 inch thickness, 0.1732 inch hole diameter
• Part of the CoroThread 266 series for use with compatible 266-series toolholders

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders that accept insert style 266, size code 16. Verify toolholder seat geometry and clamping configuration before installation.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's torque and clamping specifications. Power down and lock out the machine before changing inserts. Inspect the toolholder seat for chips or debris prior to seating the new insert. Do not exceed the recommended cutting parameters for the grade and coating specified by the manufacturer.