Sandvik Coromant 5757956 Threading Insert 14 Tpi Un

Product Description

The SANDVIK COROMANT 5757956 is a laydown threading insert from the CoroThread 266 series, designed for cutting right-hand internal UN threads on CNC lathes and turning centers. This solid carbide insert carries a dual PVD coating of TiCrAlN and TiAlN under manufacturer grade 1125, providing wear resistance suited for threading steel, stainless, and similar ferrous materials. Key cutting geometry includes a 60-degree included angle, 14 threads per inch (TPI), a chipbreaker designation of A, and a single tooth per side configuration. The insert measures 3/8 inches inscribed circle and 5/32 inches thick. Installation and tool selection are handled by licensed machinists and CNC operators working to print on threading operations.

This insert is intended for internal UN thread-form applications on machine tools equipped with compatible CoroThread 266 toolholders. The right-hand cutting orientation suits standard internal threading passes on through-holes and blind bores where UN thread standards are specified. Typical applications include production threading on turned components in manufacturing environments. The grade 1125 with PVD coating is positioned for general-purpose threading across a range of ferrous workpiece materials at moderate to higher cutting speeds. This insert is sold individually but carries a minimum order quantity of 10 units.

Key Features

• Solid carbide substrate with dual PVD coating: TiCrAlN and TiAlN for wear resistance
• Right-hand internal UN thread form, 14 TPI with 60-degree included angle
• CoroThread 266 series insert style, size code 16
• 3/8 inch (9.53 mm) inscribed circle; 5/32 inch (3.97 mm) thickness
• Single tooth per side with chipbreaker style A geometry
• Hole diameter 0.1732 inches (4.40 mm) for secure clamping in compatible holders

Compatibility

Designed for use in CoroThread 266 series toolholders that accept size 16 laydown threading inserts. Verify holder compatibility with the insert size code and clamping style before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine tool before changing inserts. Use the correct torque driver or clamping screw specified by the toolholder manufacturer — do not overtighten or substitute fasteners. Confirm thread form, TPI, and hand designation against the job print before initiating the threading cycle.