Carmex 16IR12UNBXC Threading Insert 12 Tpi 3/8 in Internal Un

Product Description

The CARMEX 16IR12UNBXC is a solid carbide laydown threading insert designed for internal UN thread cutting at 12 threads per inch. Built with a 60-degree included angle and a 3/8 inch inscribed circle, this insert handles right-hand internal threading operations on a wide range of workpiece materials. The PVD-applied TiN coating extends tool life by reducing wear and heat buildup at the cutting edge. At 0.146 inches thick, the insert seats reliably in compatible laydown-style toolholders. Licensed machinists and CNC lathe operators rely on this insert for precision thread forms in production and job-shop environments.

This insert is suited for both production and repair threading of internal UN threads in materials spanning steel, stainless, cast iron, aluminum, non-ferrous alloys, and heat-resistant superalloys, consistent with primary workpiece material codes H, K, M, N, P, and S. It is appropriate for use on CNC turning centers and manual lathes equipped with a compatible 16IR-series laydown insert holder. Applications include threading bores, nuts, couplings, and fittings across general manufacturing and maintenance machining operations.

Key Features

• Solid carbide substrate for rigidity and wear resistance in demanding threading operations
• PVD TiN coating applied via physical vapor deposition for extended cutting edge life
• 12 TPI UN thread profile with 60-degree included angle for standard unified thread forms
• Right-hand internal cut geometry suited for standard bore threading
• 3/8 inch inscribed circle and 0.146 inch thickness for positive seating in 16IR toolholders
• Universal workpiece material compatibility across ferrous, non-ferrous, and superalloy materials

Compatibility

Designed for use with 16IR-series laydown insert toolholders for internal threading. Compatible with workpiece material codes H, K, M, N, P, and S as specified by the manufacturer. Confirm holder bore and insert pocket dimensions before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine before seating or replacing the insert. Use the correct torque wrench and insert screw specified by the toolholder manufacturer - do not overtighten, as carbide inserts are brittle and can fracture under excessive clamping force. Inspect the insert pocket for chips or debris before seating the new insert to ensure full, flat contact.