Hertel 16ER8UNHG225TR Threading Insert 8 Tpi Solid Carbide

Product Description

The HERTEL 16ER8UNHG225TR is a laydown-style threading insert designed for external UN thread turning operations on CNC lathes and turning centers. Manufactured from solid carbide with a PVD-applied TiAlN coating, it delivers wear resistance and thermal stability during threading cuts. The insert produces right-hand external UN threads at 8 threads per inch (TPI) and features a 3/8-inch inscribed circle with a thickness of 0.146 inches. The HG225TR grade designation reflects the specific carbide substrate and coating combination. Machining professionals and toolroom technicians use this insert for precision threading in production and job-shop environments.

This insert is suited for external threading applications on ferrous and non-ferrous workpieces where UN thread form accuracy is required. The 16ER insert style seats in compatible laydown threading toolholders. With an 8 TPI pitch, it is appropriate for threading operations on medium to coarse unified national thread profiles. The TiAlN coating extends tool life in dry or minimal-coolant cutting conditions, making it practical for high-cycle threading runs on turning equipment.

Key Features

• Solid carbide construction with PVD TiAlN coating for extended wear life
• 8 TPI for unified national external thread profile production
• 3/8-inch inscribed circle for use in standard 16ER laydown toolholders
• Right-hand cutting geometry for conventional external threading passes
• 0.146-inch insert thickness provides rigid seating in the pocket
• HG225TR grade balances hardness and toughness for threading applications

Compatibility

Designed for use in toolholders accepting the 16ER laydown threading insert style. Confirm toolholder pocket geometry and insert seating dimensions before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before seating or removing any insert. Use the correct torque wrench and clamp screw specified by the toolholder manufacturer to secure the insert — do not overtighten by hand. Inspect the insert pocket for chips or debris before seating a new insert to ensure proper contact and prevent insert rocking during the threading pass.