Carmex 11IR18UNBMA Threading Insert 18 Tpi Un Carbide

Product Description

The CARMEX 11IR18UNBMA is a solid carbide laydown threading insert designed for internal threading operations on CNC lathes and turning centers. Built to the 11IR style with a 60-degree included angle and a 1/4-inch inscribed circle, this insert cuts Unified National (UN) thread forms at 18 threads per inch (TPI). The BMA grade features a PVD coating process that extends tool life across a broad range of workpiece materials. Machinists and toolroom operators rely on this right-hand insert for producing accurate internal UN threads in production and job-shop environments.

This insert is suited for internal threading on a wide variety of material types, including steel, stainless steel, cast iron, aluminum, nonferrous alloys, and high-temperature alloys, as indicated by the universal workpiece material codes H, K, M, N, P, and S. It fits standard 11IR toolholders and is appropriate for both light production runs and high-volume CNC threading applications where consistent thread form and dimensional accuracy are required.

Key Features

• Solid carbide construction for rigidity and wear resistance at elevated cutting speeds
• PVD coating process for improved edge toughness and extended insert life
• 60-degree included angle produces standard UN thread form geometry
• 18 TPI internal threading, right-hand cut
• 1/4-inch inscribed circle, 11IR insert style for compatibility with standard toolholders
• Universal grade BMA suitable across steel, stainless, cast iron, aluminum, and superalloys

Compatibility

Designed for use with standard 11IR internal threading toolholders. Compatible with workpiece material categories H, K, M, N, P, and S, covering a broad range of metals including carbon steel, stainless steel, cast iron, nonferrous, and high-temperature alloys.

Installation Notes

Installation is performed by machining personnel on CNC or manual lathes equipped with a compatible 11IR boring bar or internal threading holder. Ensure the machine spindle is fully stopped and all axes are at a safe home position before seating or replacing the insert. Use the correct torx or hex key to torque the clamping screw to the toolholder manufacturer's specification. Verify thread pitch and depth with a calibrated thread gauge after initial cuts before running production quantities.