Hertel H59875559 TPCG321 HP520B Carbide Boring Insert

Product Description

The HERTEL H59875559 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to TPCG321 geometry with an HP520B grade designation, this insert features a 60-degree triangular shape, a 3/8-inch inscribed circle, and a 1/8-inch thickness. The PVD-applied TiN coating improves surface hardness and wear resistance, extending tool life in ferrous and non-ferrous machining applications. With an 11-degree relief angle and a 1/64-inch corner radius, it delivers clean finishes in bore profiling and diameter work. Licensed machinists and CNC setup technicians are the primary installers of this insert type.

This insert is suited for boring operations in production machining environments, including job shops and manufacturing facilities running medium to light cuts in steel, cast iron, and similar materials. It is configured for left-hand cutting orientation, making it appropriate for specific boring bar orientations and spindle directions. The TPCG321 form factor fits screw-lock boring bar toolholders designed for triangular inserts with the corresponding size code and seating geometry. Minimum order quantity is 10 units; each package contains 1 insert.

Key Features

• Solid carbide construction, material grade C5, for rigidity and wear resistance in boring applications
• PVD TiN coating applied for increased surface hardness and extended tool life
• 60-degree triangular insert shape (TPCG style) with 11-degree relief angle for clearance in bore profiles
• 1/64-inch corner radius for controlled surface finish on internal diameters
• Left-hand cutting orientation for compatibility with appropriate boring bar setups
• Screw holding method for secure, repeatable insert indexing in the toolholder pocket

Compatibility

Designed to fit screw-lock boring bar toolholders accepting TPCG321 triangular inserts with a 3/8-inch inscribed circle. Consult toolholder manufacturer documentation to confirm pocket geometry and screw compatibility before installation.

Installation Notes

Insert installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before changing inserts. Use the correct torque driver for the clamping screw to avoid cracking the carbide substrate — refer to the toolholder manufacturer's specification for the required clamping screw torque. Inspect the toolholder pocket and seating surfaces for chips or debris before seating the new insert.