Carmex 16ER40UNP25C Threading Insert 40 Tpi 3/8 Ic Carbide

Product Description

The CARMEX 16ER40UNP25C is a solid carbide laydown threading insert engineered for external UN thread cutting on CNC lathes and turning centers. It features a 40 threads per inch (TPI) pitch, a 3/8 inch inscribed circle (IC), and a 0.146 inch thickness. The insert carries a manufacturer grade of P25C and a material grade of C5, making it suitable for a broad range of workpiece materials. A PVD-applied TiN coating improves wear resistance and extends tool life in demanding threading operations. This insert is used by machinists and toolroom professionals performing precision external threading on production or repair work.

The 16ER40UNP25C is designed for right-hand external threading applications following UN thread standards at 40 TPI. It fits 16-style insert holders used on CNC and manual turning equipment. The included angle is 29 degrees, which is correct for UN thread form geometry. The universal workpiece material designation covers a wide range of materials including steel, stainless, cast iron, aluminum, and high-temperature alloys, as reflected by the H, K, M, N, P, and S material codes. This makes it a practical single-insert solution across varied production environments.

Key Features

• Solid carbide construction with PVD TiN coating for extended cutting life
• 40 TPI UN external thread form with 29-degree included angle
• 3/8 inch inscribed circle fits 16-style laydown insert holders
• P25C grade with C5 material rating for broad material compatibility
• Right-hand cutting orientation for standard external threading
• Certified to CE, ISO 13485:2016, ISO 14001:2015, and ISO 45001 standards

Compatibility

Designed for use in 16ER-style laydown threading insert holders for external UN thread applications. Suitable for workpiece material codes H, K, M, N, P, and S as designated by the manufacturer.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's torque and seating specifications. Ensure the machine spindle is fully stopped and the machine is in a safe state before changing inserts. Verify the insert is fully seated and properly locked in the pocket before resuming cutting operations. Follow applicable shop safety procedures and consult the threading insert holder documentation for correct clamping method.