Sandvik Coromant 5758029 Threading Insert 11.5 Tpi Npt

Product Description

The SANDVIK COROMANT 5758029 is a laydown threading insert designed for cutting internal NPT threads in metalworking and machining applications. Part of the CoroThread 266 series, it features a solid carbide substrate with a PVD-applied TiN coating for wear resistance and tool life. The insert produces right-hand internal threads at 11.5 threads per inch (TPI) with a 60-degree included angle and a 1/2-inch (12.70 mm) inscribed circle. At 0.2190 inches (5.56 mm) thick with a 0.2244-inch hole diameter, it seats securely in compatible 266-series toolholders. Qualified machinists and toolroom technicians install this insert on CNC lathes and threading centers where precise NPT pipe thread forms are required.

This insert is suited for internal NPT pipe thread operations on lathes and turning centers in production machining, job shop, and maintenance environments. The NPT thread standard is used widely in North American pipe and fitting assemblies, making this insert applicable across industries including oil and gas, hydraulics, plumbing fabrication, and industrial manufacturing. The insert style code 266RL-22NT02A115E in manufacturer cataloging identifies the geometry, hand, thread type, and grade for precise toolholder matching. The chipbreaker designation A is suited for controlled chip formation during internal threading passes. This insert is sold individually with a minimum order quantity of 10 pieces.

Key Features

• Solid carbide substrate with PVD TiN coating for extended wear resistance
• Right-hand internal NPT thread form at 11.5 TPI with 60-degree included angle
• 1/2-inch inscribed circle for use in 266-series 22-size toolholders
• Two teeth per side geometry for efficient thread profile engagement
• Chipbreaker type A supports controlled chip evacuation on internal threading passes
• CoroThread 266 series insert with manufacturer grade 1020 carbide

Compatibility

Designed for use in SANDVIK COROMANT CoroThread 266 series toolholders accepting size 22 laydown threading inserts. Insert style code 266RL-22NT02A115E identifies the correct toolholder and pocket geometry required. Confirm toolholder insert seat specifications before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before changing inserts. Use the correct torx or hex key torque driver specified by the toolholder manufacturer when seating the insert clamp screw — do not overtighten by hand estimation. Inspect the insert pocket for chips or debris before seating the new insert to ensure proper contact and thread accuracy.