Hertel H59875898 TPGH322 HT540B Boring Insert Solid Carbide

Product Description

The HERTEL H59875898 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured in the TPGH insert style with a triangular 60-degree included angle, this uncoated carbide insert is suited for machining operations where sharp edge geometry and tight tolerances are required. It carries a manufacturer grade designation of HT540B and a material grade of C1, indicating suitability for cast iron and general-purpose ferrous and non-ferrous cutting applications. The 11-degree relief angle reduces rubbing and promotes clean chip formation during light to moderate cuts. Each insert is sold individually, with a minimum order quantity of 10 units.

This insert is used in boring bars and toolholders that accept TPGH-style triangular inserts with screw-style clamping. It is appropriate for shop environments running close-tolerance bore work in production or job-shop settings. The uncoated solid carbide construction makes it a strong choice for applications where coating adhesion or thermal barrier properties are less critical than edge sharpness and dimensional precision. Licensed machinists, tool and die setters, and CNC operators are the typical end users for this type of insert.

Key Features

• TPGH insert style with 60-degree triangular geometry for versatile boring applications
• Solid carbide construction, uncoated, for sharp cutting edges on ferrous and non-ferrous materials
• 1/32 inch corner radius for tight-tolerance bore finishing
• 3/8 inch inscribed circle for compatibility with standard TPGH boring bar seats
• 11-degree relief angle reduces flank contact and supports clean chip evacuation
• Screw-style insert holding method for secure clamping and repeatable indexing

Compatibility

Designed for use in boring bars and toolholders accepting TPGH322-style triangular carbide inserts with screw-style clamping. Verify toolholder seat geometry and insert pocket dimensions before installation.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and the machine is in a safe, locked-out state before changing inserts. Use the appropriate torx or hex key to seat the clamping screw to the toolholder manufacturer's specified procedure without over-torquing the insert pocket. Inspect the insert seat and clamping screw for wear or debris before seating a new insert.