Hertel H59875872 Boring Insert TPGH322 Solid Carbide

Product Description

The HERTEL H59875872 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to the TPGH322 standard, this uncoated insert features a 60-degree triangular geometry with an 11-degree relief angle and a 1/32 inch (0.0310 inch) corner radius. The inscribed circle measures 3/8 inch (0.3750 inch) and the insert thickness is 1/8 inch (0.1270 inch). Rated to material grade C25, it is suited for machining a range of workpiece materials where an uncoated carbide edge is preferred. Screw-type holding secures the insert firmly in compatible boring bar pockets.

This insert is used in internal boring, light turning, and finishing applications in metalworking environments. Its triangular TPGH-style geometry is commonly selected for close-tolerance bore finishing on ferrous and non-ferrous materials. Machinists and tool-and-die professionals working in production shops, job shops, and maintenance machining will find this insert applicable across a wide range of bore diameters where a compact, rigid insert geometry is required. The uncoated surface is appropriate for applications where coating adhesion or heat buildup would be a concern, such as low-speed finishing cuts or non-ferrous materials.

Key Features

• Solid carbide construction, material grade C25, for rigidity and wear resistance in boring applications
• 60-degree triangular insert shape (TPGH style) with 11-degree relief angle for clearance in tight bore geometries
• 1/32 inch corner radius (0.0310 inch) for controlled surface finish on finished bores
• 3/8 inch inscribed circle for compatibility with standard TPGH322 boring bar pockets
• Screw-type insert holding method for positive, repeatable seating
• Uncoated finish suitable for finishing cuts on non-ferrous and select ferrous materials

Compatibility

Designed as an OEM-style replacement or direct-fit insert for boring bars and tool holders accepting TPGH322 standard inserts with a screw-type clamping method.

Installation Notes

Installation should be performed by a qualified machinist following the boring bar or toolholder manufacturer's torque and clamping specifications. Ensure the machine spindle is fully stopped and all motion has ceased before indexing or replacing inserts. Use the appropriate Torx or hex key as specified by the toolholder manufacturer to secure the clamping screw. Inspect the insert pocket and seating surface for chips or debris before seating the insert to ensure proper contact and runout control.