Hertel H00208223 Boring Insert TPMT322GP Solid Carbide

Product Description

The HERTEL H00208223 is a solid carbide boring insert in TPMT style, designed for precision internal boring operations on CNC lathes and machining centers. Manufactured to the TPMT322GP geometry with an HP520B grade designation, this insert features a Physical Vapor Deposition (PVD)-applied Titanium Nitride (TiN) coating for improved wear resistance and surface finish on a range of workpiece materials. The 60-degree triangular shape provides three usable cutting edges per insert. Key dimensional specs include a 3/8-inch inscribed circle (0.3750 inches), 1/8-inch thickness (0.1250 inches), and a 1/32-inch corner radius (0.0310 inches). A licensed machinist or CNC tooling technician is the typical installer.

This insert is suited for boring applications in precision machining environments, including general-purpose turning and internal diameter finishing operations. The GP chipbreaker geometry supports controlled chip evacuation during moderate material removal. The TPMT style and screw-holding method make this insert compatible with standard TPMT-style boring bars and toolholders used in both production and job-shop settings. The C5 material grade is appropriate for cutting cast iron, steel alloys, and similar ferrous workpiece materials at appropriate speeds and feeds per shop practice.

Key Features

• Solid carbide substrate with PVD TiN coating for extended tool life in ferrous materials
• TPMT322GP geometry with GP chipbreaker for controlled chip formation
• 60-degree triangular shape delivers three usable cutting edges per insert
• Screw-holding method (TPMT style) for secure, repeatable seating in compatible toolholders
• 1/32-inch (0.0310-inch) corner radius for a balance of edge strength and surface finish
• 11-degree relief angle reduces flank friction during internal boring passes

Compatibility

Designed for use in standard TPMT-style boring bars and insert toolholders that accept TPMT322 inserts with screw clamping. Verify toolholder seat geometry and insert size code before installation.

Installation Notes

Insert installation and replacement should be performed by a qualified machinist or CNC tooling technician with the machine spindle fully stopped and the control placed in an E-stop or locked-out state per OSHA lockout/tagout requirements. Use the correct torx or hex key to torque the clamp screw to the toolholder manufacturer's specification — do not overtighten, as this can fracture the carbide insert. Inspect the toolholder pocket and seating surface for chips or wear before seating the new insert. Handle carbide inserts with care to avoid edge chipping prior to first use.