Hertel H59873505 Boring Insert HP520B Solid Carbide

Product Description

The HERTEL H59873505 is a solid carbide boring insert designed for precision internal boring operations on CNC and manual machining centers. Manufactured to the TDHB insert style with a 60-degree triangular shape, this insert carries a HP520B grade designation and features a Physical Vapor Deposition (PVD) titanium nitride (TiN) coating for improved wear resistance and extended tool life. Key dimensional specs include a 5/32-inch inscribed circle (0.1563 inches), a 3/64-inch thickness (0.0469 inches), and a 1/32-inch corner radius (0.0310 inches). A 15-degree relief angle provides clearance geometry suited to fine boring passes. The insert is held in place via a screw-clamp method, which is standard for TDHB-style toolholders. Machinists and tool-and-die professionals are the primary installers.

This insert is suited for internal diameter boring applications where dimensional accuracy and surface finish are critical. The C5 carbide material grade makes it appropriate for machining cast iron, carbon steel, and alloy steel workpieces at moderate to high cutting speeds. The TiN coating adds a thermal and abrasion barrier that helps maintain cutting-edge integrity during continuous boring cycles. It is packaged individually but carries a minimum order quantity of 10 units, making it practical for shop stock or toolcrib replenishment programs in production machining environments.

Key Features

• Solid carbide construction with C5 material grade for wear resistance in steel and cast iron applications
• PVD TiN coating for improved surface hardness and reduced tool wear
• 60-degree triangular (TDHB) insert style with three usable cutting edges
• 15-degree relief angle provides clearance for fine boring operations
• Screw-clamp insert holding method for secure, repeatable seating in compatible toolholders
• 1/32-inch corner radius for controlled surface finish on bored diameters

Compatibility

Designed for use in TDHB-style boring toolholders that accept a triangular insert with a 5/32-inch inscribed circle and screw-clamp retention. Verify toolholder seat geometry and insert pocket dimensions before installation.

Installation Notes

Insert replacement should be performed by a qualified machinist with the spindle powered down and the machine in a locked-out, tagged-out state per applicable shop safety procedures. Use the correct torque driver for the clamping screw to avoid seat damage or insert cracking — refer to the toolholder manufacturer specification for clamping torque values. Inspect the insert pocket and clamping components for wear or debris before seating the new insert. Index or replace all edges before returning the tool to service.