Carmex 3/8INRH18UNP2 Threading Insert 18 Tpi 3/8 in Ic

Product Description

The CARMEX 3/8INRH18UNP2 is a laydown-style threading insert designed for cutting internal UN threads on a lathe or CNC turning center. Built from solid carbide with a TiN coating applied via PVD process, it delivers consistent thread form and extended tool life across a wide range of workpiece materials. The insert carries a P25C manufacturer grade and C5 material grade, making it suitable for general-purpose threading operations. It cuts at 18 threads per inch with a 60-degree included angle, conforming to UN thread standards. The inscribed circle measures 3/8 inch and the insert thickness is 0.146 inches. Licensed machinists and CNC programmers working in job shops and production environments are the primary users.

This insert is used for right-hand internal threading operations on lathes and CNC turning centers. Its universal primary workpiece material classification means it performs across steel, stainless steel, cast iron, non-ferrous metals, and high-temperature alloys. Typical applications include threading bores, nuts, and internally threaded components where a UN thread form is required. The laydown seating style provides rigid support during the threading pass, which is important for maintaining pitch accuracy and surface finish on internal threads.

Key Features

• Solid carbide construction with PVD-applied TiN coating for wear resistance and edge retention
• 18 TPI UN internal thread form with 60-degree included angle
• Right-hand cut orientation for standard internal threading passes
• P25C grade suitable for universal workpiece materials including steel, stainless, cast iron, non-ferrous, and superalloys
• 3/8 inch inscribed circle with 0.146 inch thickness in 16IR laydown insert style
• Certified to CE, ISO 13485:2016, ISO 14001:2015, and ISO 45001 standards

Compatibility

Designed for use in toolholders and boring bars that accept 16IR-style laydown threading inserts with a 3/8 inch inscribed circle seating geometry.

Installation Notes

Install this insert into a compatible 16IR internal threading toolholder using the appropriate torx or hex key per the toolholder manufacturer's seating procedure. Ensure the machine spindle is fully stopped and the turret is indexed to a safe position before changing inserts. Verify insert seating and clamp engagement before resuming cutting operations. Follow the toolholder manufacturer's recommended feed rate and depth-of-pass for the specific thread pitch and workpiece material.