Hertel H08705790 Threading Insert 18 Tpi 3/8 in Ic Un

Product Description

The HERTEL H08705790 is a laydown-style threading insert designed for right-hand internal UN thread cutting operations. Built from solid carbide with a TiC/TiN coating, it delivers wear resistance and thermal stability during threading cycles. The insert carries an 18 TPI thread pitch and fits toolholders accepting a 3/8-inch inscribed circle. At 0.146 inches thick with a 0 degree relief angle, this is a standard laydown geometry suited to production threading on CNC lathes and turning centers. Machinists and tool-and-die technicians working with Unified National thread forms will recognize the 16IR insert style designation.

This insert is used for internal threading applications where a UN thread standard is required. It is appropriate for job shop and production environments on CNC turning equipment. The TiC/TiN finish makes it suitable for threading steel and similar ferrous workpiece materials. The right-hand configuration and internal thread orientation mean it is applied in bore-threading operations using a compatible internal threading bar or holder.

Key Features

• Solid carbide substrate for rigidity and edge stability during threading
• TiC/TiN coating provides wear resistance and reduced built-up edge on ferrous materials
• 18 TPI pitch for standard Unified National coarse and fine series threads
• Right-hand, internal thread orientation in 16IR insert style
• 3/8-inch inscribed circle fits standard laydown internal threading toolholders
• 0 degree relief angle suits standard laydown seat geometry

Compatibility

Designed as an OEM-style replacement laydown threading insert for internal UN thread applications using toolholders that accept the 16IR insert style with a 3/8-inch inscribed circle seating geometry.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before changing inserts. Seat the insert fully against the pocket walls and torque the clamp screw according to the toolholder manufacturer's specification. Verify thread form and pitch with a thread gauge on the first part before committing to a production run.