Hertel H59874669 Boring Insert TPCH220.5 HC620B Carbide

Product Description

The HERTEL H59874669 is a solid carbide boring insert designed for precision internal boring operations on CNC and manual turning equipment. Formed in a 60-degree triangle shape and designated by insert style code TPCH, this insert features a multilayer CVD coating sequence of TiN, TiC, TiCN, and TiN that builds wear resistance and thermal stability during cutting. The 0.007-inch corner radius suits finishing and semi-finishing passes where edge sharpness and dimensional control are the priority. At a material grade of C7, this insert is suited for boring cast iron, steel, and similar ferrous workpiece materials. Licensed machinists and toolroom technicians are the typical end users.

This insert is applied in boring bar holders that accept the TPCH insert style with screw clamping. The 11-degree relief angle reduces rubbing on the bore wall during the cut. With a 1/4-inch inscribed circle and 3/32-inch thickness, this insert fits compact boring heads used in both job-shop and production environments. It is sold individually per package with a minimum order quantity of 10 units, making it a standard replenishment item for shops that run this insert style at volume.

Key Features

• Solid carbide substrate at material grade C7 for rigidity and wear life in ferrous boring applications
• Multilayer CVD coating - TiN, TiC, TiCN, TiN - for thermal resistance and extended tool life
• 60-degree triangle shape (TPCH style) with screw-clamp holding method for positive insert retention
• 0.007-inch corner radius for finishing and semi-finishing passes requiring tight tolerances
• 11-degree relief angle reduces bore-wall contact and minimizes chatter during internal operations
• Compact geometry: 1/4-inch inscribed circle, 3/32-inch thickness - fits standard small-bore tooling systems

Compatibility

Designed for use in boring bar systems and insert holders that accept TPCH-style triangle inserts with screw clamping, consistent with standard ISO and ANSI insert seating for this style code.

Installation Notes

Insert seating and clamping should be performed with the machine spindle locked and all power isolated from the machine tool before any tooling change. Use the correct torx or hex key at the manufacturer-specified seating torque for the boring bar clamping screw - do not overtighten, as carbide inserts are brittle and will crack under excess clamp force. Verify insert orientation and relief angle clearance in the holder before resuming cuts. Worn or chipped inserts should be replaced rather than re-run to avoid workpiece damage and unpredictable tool behavior.