Carmex 16IR18UNBMA Threading Insert 18 Tpi 3/8 Inch Internal Un

Product Description

The CARMEX 16IR18UNBMA is a solid carbide laydown threading insert designed for internal UN thread cutting at 18 threads per inch (TPI). The insert carries a TiAlN coating applied via PVD process, providing elevated hardness and heat resistance during high-speed threading operations. With a 3/8 inch (0.3750 inch) inscribed circle and a thickness of 0.1460 inches, this insert seats securely in standard laydown toolholders. The 60-degree included angle conforms to the unified national (UN) thread profile. A corner radius of 0.0030 inches supports clean thread form at the root. This insert is suited for CNC lathe and turning center applications and is typically installed by machinists and toolroom technicians.

This insert is intended for right-hand internal threading operations on UN-standard thread forms at 18 TPI. The submicron carbide grade BMA and universal workpiece material rating make it appropriate across a broad range of materials including ferrous metals, non-ferrous alloys, stainless, heat-resistant alloys, and plastics. It is a single-insert package with a minimum order quantity of 10 units, consistent with standard tooling procurement for production or job-shop environments.

Key Features

• Solid carbide submicron grade BMA for extended tool life in demanding threading applications
• TiAlN PVD coating for heat resistance and reduced built-up edge
• 18 TPI UN internal thread form with 60-degree included angle
• Right-hand cut orientation for standard internal threading
• 3/8 inch inscribed circle (0.3750 inches) for compatibility with laydown insert toolholders
• Universal workpiece material rating covering steel, stainless, aluminum, non-ferrous, and high-temp alloys

Compatibility

Designed as an OEM-style replacement and standard-fit laydown threading insert for internal UN thread toolholders accepting a 3/8 inch inscribed circle, size code 16, right-hand laydown geometry.

Installation Notes

Installation is performed by machinists or CNC toolroom technicians. Power down and lock out the machine before seating or replacing inserts. Use the appropriate torx or clamp screw driver as specified by the toolholder manufacturer to achieve proper clamping without cracking the carbide. Verify insert orientation and seating before resuming cutting operations.