Carmex 11IR18UNP25 Threading Insert 18 Tpi 1/4 Ic Carbide

Product Description

The CARMEX 11IR18UNP25 is a solid carbide laydown threading insert designed for internal right-hand UN thread cutting at 18 threads per inch. It features a 1/4 inch (0.2500 inch decimal) inscribed circle and a thickness of 0.1270 inches. The 60-degree included angle matches the standard UN thread form, and the PVD-applied TiN coating extends cutting edge life across a wide range of workpiece materials. This insert is used by machinists and toolroom professionals in CNC turning and threading operations requiring precise internal thread profiles.

The 11IR18UNP25 is suited for internal threading applications on a broad spectrum of materials, including steels, cast irons, stainless steels, non-ferrous metals, high-temperature alloys, and plastics, as reflected by its universal primary workpiece material classification covering material codes H, K, M, N, P, and S. Manufacturer grade P25C and material grade C5 position this insert for general-purpose threading at moderate cutting conditions in both production and job-shop environments.

Key Features

• Solid carbide substrate with PVD TiN coating for extended tool life
• 18 TPI UN internal thread form with 60-degree included angle
• 1/4 inch inscribed circle, 0.1270 inch thickness for secure seating in 11IR-style holders
• Right-hand cut orientation for standard internal threading operations
• Universal material compatibility across ferrous, non-ferrous, and exotic workpiece grades
• Manufactured to CE, ISO 13485:2016, ISO 14001:2015, and ISO 45001 standards

Compatibility

Designed to seat in toolholders and boring bars accepting the 11IR insert style. Suitable for UN internal threading at 18 TPI across workpiece material grades H, K, M, N, P, and S as defined by the manufacturer.

Installation Notes

This insert is installed and replaced by machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the toolholder is secured before swapping inserts. Use the appropriate torx or clamp screw torque as specified by the toolholder manufacturer. Verify insert seating and thread pitch with a thread gauge before returning the part to full production cutting speeds.