Hertel 11ER40UNJHG225T Threading Insert 40 Tpi Carbide

Product Description

The HERTEL 11ER40UNJHG225T is a solid carbide laydown threading insert designed for external UNJ thread cutting on CNC lathes and threading machines. Built to the 11 ER insert style, it cuts right-hand threads at 40 threads per inch (TPI) and features a TiAlN coating applied via PVD process. The TiAlN finish improves heat resistance and tool life in demanding threading applications. With a 0.25 inch inscribed circle and 0.127 inch thickness, this insert fits standard 11 ER toolholders. It is used by machinists and CNC operators working to aerospace and precision fastener thread standards.

This insert is suited for threading operations requiring UNJ thread form compliance, which specifies a controlled root radius for improved fatigue resistance in critical fastener applications. Typical use cases include aerospace component manufacturing, precision shaft threading, and high-strength fastener production where UNJ thread standards are specified. The right-hand cutting geometry and PVD TiAlN coating make it a strong choice for stainless steel, alloy steel, and other challenging workpiece materials. Sold individually with a minimum order quantity of 10 pieces.

Key Features

• Solid carbide substrate with PVD TiAlN coating for extended tool life and heat resistance
• 40 TPI right-hand external UNJ thread form for aerospace and precision fastener applications
• 11 ER insert style with 0.25 inch inscribed circle fits standard compatible toolholders
• 0.127 inch insert thickness provides a rigid, stable cutting platform
• Manufacturer grade HG225TR indicating a coated fine-grain carbide formulation

Compatibility

Designed as an OEM-style replacement or direct-fit insert for toolholders accepting the 11 ER laydown threading insert style with a 0.25 inch inscribed circle.

Installation Notes

Installation is performed by CNC machinists or tool-and-die professionals. Power down and lock out the machine spindle before seating or removing inserts. Use the correct torx or hex key to the toolholder manufacturer's specified clamping method — do not overtighten the clamp screw, as carbide inserts can fracture under excess clamping force. Verify insert seating and thread pitch setup against a thread gauge before running production.