Hertel H59875484 Boring Insert TPCG320.5 HC620B Carbide

Product Description

The HERTEL H59875484 is a solid carbide boring insert designed for precision metal cutting applications in turning and boring operations. Manufactured to the TPCG320.5 insert style in grade HC620B, this insert features a 60-degree triangular geometry with an 11-degree relief angle and a 0.007-inch corner radius. The CVD coating stack - TiN, TiC, TiCN, TiN - delivers wear resistance and thermal stability suited to machining ferrous materials in the C7 material grade range. It is sized at 3/8-inch inscribed circle and 1/8-inch thickness, making it a standard fit for a range of boring bar holders. Machinists and toolroom technicians install this insert on CNC lathes and boring mills.

This insert is intended for left-hand boring operations in metalworking environments, including production machining shops and maintenance toolrooms. The TPCG geometry and screw-clamp holding method suit medium to finish-pass boring cuts where dimensional accuracy and surface finish are critical. The triangular 60-degree included angle provides three usable cutting edges per insert, supporting cost-effective tooling rotation in high-volume turning setups. The HC620B grade with multi-layer CVD coating is commonly applied to steel, cast iron, and similar ferrous workpiece materials in the C7 grade classification.

Key Features

• TPCG320.5 insert style with HC620B manufacturer grade
• Solid carbide substrate with multi-layer CVD coating: TiN, TiC, TiCN, TiN
• 60-degree triangular shape provides three usable cutting edges per insert
• 0.007-inch corner radius for controlled finish on boring passes
• 11-degree relief angle suited for left-hand boring bar applications
• Screw-clamp insert holding method for secure seating in compatible toolholders

Compatibility

Designed as a left-hand screw-clamp boring insert compatible with TPCG-style toolholders accepting a 3/8-inch inscribed circle, 1/8-inch thick triangular insert. Catalog reference number TPCG3205L.

Installation Notes

This insert is installed by machining technicians into compatible TPCG screw-clamp boring bar holders. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench and clamp screw for the toolholder to avoid cracking the carbide substrate - do not overtighten by hand or with standard hex drivers. Inspect the insert pocket and seating surface for chips or debris before seating the new insert.