Hertel H59874529 Boring Insert TPCG221 HP520B Solid Carbide

Product Description

The HERTEL H59874529 is a solid carbide boring insert designed for precision metal cutting operations in turning and boring applications. Manufactured to the TPCG221 insert style, it features a 60-degree triangular geometry and a titanium nitride (TiN) coating applied via PVD process, which improves surface hardness and wear resistance. The insert carries a material grade of C5, suited for machining cast iron, non-ferrous metals, and some steel applications at moderate cutting conditions. A corner radius of 0.015 inches and an 11-degree relief angle combine to deliver clean, controlled cutting action. Installation and replacement are handled by machinists and toolroom technicians as part of routine insert indexing on boring bars and turning holders.

This insert fits screw-on style toolholders configured for TPCG-geometry inserts. It is used in CNC turning centers, manual lathes, and boring mills where a right-hand cutting orientation is required. The 0.25-inch inscribed circle and 0.096-inch thickness are standard dimensions for this insert size code, making it compatible with a broad range of TPCG221-spec toolholders used in production and jobshop machining environments. Typical applications include internal diameter boring, light facing, and finish turning passes where dimensional accuracy and surface finish are priorities.

Key Features

• Solid carbide construction at material grade C5 for consistent hardness and cutting edge integrity
• TiN coating via PVD process reduces friction and extends tool life compared to uncoated inserts
• 60-degree triangular shape provides up to six usable cutting edges per insert
• 11-degree relief angle minimizes rubbing and supports clean chip clearance in boring operations
• Screw-on insert holding method ensures secure seating and repeatable positioning on index
• Right-hand cutting orientation for standard boring bar and turning holder configurations

Compatibility

Designed as an OEM-style replacement insert for screw-clamped toolholders accepting TPCG221 insert geometry in right-hand cutting configurations.

Installation Notes

Insert replacement is performed by machinists using a torx or hex key driver appropriate for the toolholder screw. Always power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully into the pocket and confirm the screw is torqued to the toolholder manufacturer specification before resuming cutting. Inspect the insert pocket for chips or debris that could prevent flat seating and cause premature edge failure.